Electromedical Treatments for Arachnoiditis

By Dr. Forest Tennant, PNN Columnist  

Adhesive Arachnoiditis (AA) is an inflammatory, nerve root entrapment disease in which cauda equina nerve roots are glued by adhesions to the arachnoid-dural covering of the spinal canal. An inflamed tumor-like mass is formed inside the spinal canal that blocks spinal fluid flow, allows seepage of fluid into tissue outside the spinal canal and shuts off electrical impulses that activate the legs, feet, bladder, intestine and sex organs. Autoimmunity is produced and/or magnified by AA. 

We highly recommend a three-component protocol for AA to reduce inflammation and autoimmunity, regenerate damaged tissue and to provide pain control. Recent advances in electromedical therapies can help achieve these three goals. 

There are two basic types of electromedical devices available for AA treatment: electric current therapy (EC) and electromagnetic therapy (EM). 

Electric Current Therapy 

Almost everyone is familiar with “TENS” units, which stands for “transcutaneous electrical nerve stimulation.” These devices were the first electromedical therapies to relieve pain and promote healing.

TENS units deliver a single electric current into tissues to produce an anesthetic, pain relieving effect.  

Today, more advanced EC devices administer micro-currents and/or a combination of multiple currents with different frequencies. 

Electromagnetic Therapy 

There is a form of energy that is half electricity and half magnetism, which can be divided into wave lengths. The very shortest wave of electromagnetic energy is “atomic” and the longest is “radio.” The shortest wave used in medicine is “laser.” Other electromagnetic energy waves used for medical purposes include infrared, light and microwave. 

EC and EM devices, when placed over the lower back, deliver electric current or electromagnetic energy to the lumbar-sacral spinal canal and the spine’s surrounding tissue.

Modern devices use intermittent pulsation of electric currents or electromagnetic energy to penetrate the skin and subcutaneous tissue to reach the AA site, which is usually about 2-3 inches below the skin.  

Some devices use the label PEMF, which stands for “pulsed electromagnetic frequency.” We believe that the newer EC and EM devices can deliver electric currents or electromagnetic energy that, when pulsed, penetrate deep enough to reach the AA disease site. 

Although not totally curative, these devices usually bring about pain reduction in the 20 to 30% range. Within an individual’s financial capability, we recommend that an EC and/or EM device be used 2 to 3 times a week (not daily). EC and EM therapy are not substitutes for a medical protocol. 

EM and EC devices often produce some initial healing, but later seem to stop working. In this situation the device may have done its maximal healing. The devices can still be used periodically to prevent relapses and treat flares. 

Forest Tennant, MD, DrPH, is retired from clinical practice but continues his research on the treatment of intractable pain and arachnoiditis. This column is adapted from a bulletin recently issued by the Arachnoiditis Research and Education Project. Readers interested in subscribing to the bulletins should click here.

Dr. Tennant’s new book, "Clinical Diagnosis and Treatment of Adhesive Arachnoiditis” is available on Amazon. 

The Tennant Foundation gives financial support to Pain News Network and sponsors PNN’s Patient Resources section.   

Popular Exercises for Persons with Arachnoiditis

By Dr. Forest Tennant, PNN Columnist 

Adhesive Arachnoiditis (AA) is an inflammatory, nerve root entrapment disease in which cauda equina nerve roots are glued by adhesions to the arachnoid-dural covering of the spinal canal. An inflamed tumor-like mass is formed inside the spinal canal that blocks spinal fluid flow, allows seepage of fluid into tissue outside the spinal canal, and shuts off electrical impulses that activate the legs, feet, bladder, intestine and sex organs.  

Some specific exercises help neutralize the deleterious effects of AA and promote regeneration of damaged tissue.  We surveyed 40 persons with MRI-documented AA to determine which exercises they found most beneficial.

The top five are listed here in descending order of popularity. 

1. Water Soaking: It is no surprise this is No.1. Water soaking pulls out toxins and excess electricity and relaxes muscles. All types of water soaking are good: pool, jacuzzi, shower, tub, hot/wet towel. Epsom Salts in water mimic the mineral baths used therapeutically by ancient peoples. 

2. Massage: Kneading of back muscles causes any seepage of spinal fluid to mobilize and causes spinal fluid to keep moving around the AA blockage in the spinal canal. 

3. Walking: Nerve roots that activate the legs and feet can become so inflamed and entrapped that one can’t walk. Short daily walks are essential to prevent the development of paralysis and weakness. 

4. Arm & Leg Stretching: Entrapped nerve roots in the AA mass decrease the normal leg, arm, and foot fidgets and movements that occur every few minutes even while sleeping. Arm and leg stretching will keep the lower back muscles from contracting or shrinking which, over time, will increase back pain. 

5. Deep Breathing: Deep breathing and short breath-holds bring oxygen to the spinal canal to promote healing. It will also help keep spinal fluid moving. Deep breathing is best done while standing but it can be done while sitting and watching TV, driving, or eating. 

Other exercises compliment the AA medical treatment protocol. Besides those listed here, we also advocate light weightlifting, rocking, bicycling, and trampoline walking. 

Credit: Lynn Ashcraft did the data analysis of this survey. 

Forest Tennant, MD, DrPH, is retired from clinical practice but continues his research on the treatment of intractable pain and arachnoiditis. This column is adapted from a bulletin recently issued by the Arachnoiditis Research and Education Project. Readers interested in subscribing to the bulletins should click here.

Dr. Tennant’s new book, "Clinical Diagnosis and Treatment of Adhesive Arachnoiditis” is available on Amazon. 

The Tennant Foundation gives financial support to Pain News Network and sponsors PNN’s Patient Resources section.   

Migraine Sufferers Have Treatment Options Besides Medication

By Dr. Danielle Wilhour

Migraine headaches currently affect more than one billion people across the globe and are the second-leading cause of disability worldwide. Nearly one-quarter of U.S. households have at least one member who suffers from migraines. An estimated 85.6 million workdays are lost as a result of migraine headaches each year.

Yet many who suffer with migraine dismiss their pain as simply a bad headache. Rather than seeking medical care, the condition often goes undiagnosed, even when other incapacitating symptoms occur alongside the pain, including light and sound sensitivity, nausea, vomiting and dizziness.

Researchers have discovered that genetics and environmental factors play a role in the condition of migraine. They happen when changes in your brainstem activate the trigeminal nerve, which is a major nerve in the pain pathway. This cues your body to release inflammatory substances such as CGRP, short for calcitonin gene-related peptide. This molecule, and others, can cause blood vessels to swell, producing pain and inflammation.

Medication Has Its Limits

A migraine can be debilitating. Those who are experiencing one are often curled up in a dark room accompanied by only their pain. Attacks can last for days; life is put on hold. The sensitivity to light and sound, coupled with the unpredictability of the disease, causes many to forego work, school, social gatherings and time with family.

Numerous prescription medications are available for both the prevention and treatment of migraine. But for many people, conventional treatment has its limitations. Some people with migraine have a poor tolerance for certain medications. Many can’t afford the high cost of the medicines or endure the side effects. Others are pregnant or breastfeeding and can’t take the medications.

However, as a board-certified neurologist who specializes in headache medicine, I’m always amazed at how open-minded and enthusiastic patients become when I discuss alternative options.

Your brain sends you warning signals, such as fatigue and mood changes, to let you know a migraine may be on the way.

These approaches, collectively, are called complementary and alternative medicine. It might be surprising that a traditionally trained Western doctor like me would recommend things like yoga, acupuncture or meditation for people with migraine. Yet in my practice, I value these nontraditional treatments.

Research shows that alternative therapies are associated with improved sleep, feeling better emotionally and an enhanced sense of control. Some patients can avoid prescription medications altogether with one or more complementary treatments. For others, the nontraditional treatments can be used along with prescription medication.

These options can be used one at a time or in combination, depending on how severe the headache and the cause behind it. If neck tension is a contributor to the pain, then physical therapy or massage may be most beneficial. If stress is a trigger, perhaps meditation would be an appropriate place to start. It is worth talking to your provider to explore which options may work best for you.

Mindfulness and Meditation

Because stress is a major trigger for migraines, one of the most effective alternative therapies is mindfulness meditation, which is the act of focusing your attention on the present moment in a nonjudgmental mindset. Studies show that mindfulness meditation can reduce headache frequency and pain severity.

Another useful tool is biofeedback, which enables a person to see their vital signs in real time and then learn how to stabilize them.

For example, if you are stressed, you may notice muscle tightness, perspiration and a fast heart rate. With biofeedback, these changes appear on a monitor, and a therapist teaches you exercises to help manage them. There is strong evidence that biofeedback can lessen the frequency and severity of migraine headaches and reduce headache-related disability.

Yoga derives from traditional Indian philosophy and combines physical postures, meditation and breathing exercises with a goal of uniting the mind, body and spirit. Practicing yoga consistently can be helpful in reducing stress and treating migraine.

Meditation is an alternative therapy that could help with your migraine.

Physical Therapy

Physical therapy uses manual techniques such as myofascial and trigger-point release, passive stretching and cervical traction, which is a light pulling on the head by a skilled hand or with a medical device. Studies show that physical therapy with medication was superior in reducing migraine frequency, pain intensity and pain perception over medications alone.

By lowering stress levels and promoting relaxation, massage can decrease migraine frequency and improve sleep. It may also reduce stress in the days following the massage, which adds further protection from migraine attacks.

Some patients are helped by acupuncture, a form of traditional Chinese medicine. In this practice, fine needles are placed in specific locations on the skin to promote healing. A large 2016 meta-analysis paper found acupuncture reduced the duration and frequency of migraines regardless of how often they occur. Acupuncture benefits are sustained after 20 weeks of treatment.

What’s also fascinating is that acupuncture can change the metabolic activity in the thalamus, the region of the brain critical to pain perception. This change correlated with a decrease in the headache intensity score following acupuncture treatment.

Vitamins, Supplements and Nutraceuticals

Herbal supplements and nutraceuticals, which are food-derived products that may have therapeutic benefit, can also be used to prevent migraine. And there is evidence to suggest vitamins work reasonably well compared to traditional prescription medication. They also have fewer side effects. Here are some examples:

• Magnesium is believed to help regulate the blood vessels and electrical activity in the brain. A study found that patients given 600 milligrams of magnesium citrate daily for 12 weeks had a 40% decrease in migraine. Side effects included diarrhea in nearly 20% of patients.

• Vitamin B2, or riboflavin, is also considered useful in migraine prevention. When dosed at 400 milligrams daily for 12 weeks, researchers found it reduced migraine frequency by half in more than half of participants.

• Another beneficial supplement is Coenzyme Q10, which is involved in cellular energy production. After three months, about half of those taking 100 milligrams of Coenzyme Q10 three times a day had half the number of migraine attacks.

• A potential natural solution is feverfew or Tanacetum parthenium, a daisylike perennial plant known to have anti-migraine properties. Taken three times daily, feverfew reduced migraine frequency by 40%.

Medical Devices

The Food and Drug Administration has approved several neurostimulation devices for migraine treatment. These devices work by neutralizing the pain signals sent from the brain.

One is the Nerivio device, which is worn on the upper arm and sends signals to the brainstem pain center during an attack. Two-thirds of people report pain relief after two hours, and side effects are rare.

Another device that shows promise is the Cefaly. It delivers a mild electrical current to the trigeminal nerve on the forehead, which can lessen the frequency and intensity of migraine attacks. After one hour of treatment, patients experienced a nearly 60% reduction in pain intensity, and the relief lasted up to 24 hours. Side effects are uncommon and include sleepiness or skin irritation.

These alternative therapies help treat the person as a whole. In just my practice, many success stories come to mind: the college student who once had chronic migraine but now has rare occurrences after a regimen of vitamins; the pregnant woman who avoided medication through acupuncture and physical therapy; or the patient, already on numerous prescription medications, who uses a neurostimulation device for migraine instead of adding another prescription.

Granted, alternative approaches are not necessarily miracle therapies, but their potential to relieve pain and suffering is notable. As a physician, it is truly gratifying to see some of my patients respond to these treatments.

Danielle Wilhour, MD, is an Assistant Professor of Neurology, University of Colorado Anschutz Medical Campus. Her primary interests include non-pharmacologic treatment of headache as well as headache during pregnancy.  Danielle does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article.

This article originally appeared in The Conservation and is republished with permission.

Experimental Implant Uses Coolant to Numb Nerve Pain

By Pat Anson, PNN Editor

Applying ice on inflamed tissues and sore muscles is one of the oldest ways to relieve pain and promote healing.  Researchers at Northwestern University are taking that tried-and-true method a step further, with the development of a small, flexible implant that can alleviate pain by literally cooling nerves.

Researchers believe the experimental implant could be most beneficial to patients who undergo surgeries, nerve grafts or even amputations. Surgeons could implant the device during the procedure to help patients manage post-operative pain on demand without the use of drugs.

“As engineers, we are motivated by the idea of treating pain without drugs — in ways that can be turned on and off instantly, with user control over the intensity of relief,” says John Rogers, PhD, Professor of Materials Science and Engineering at Northwestern and lead author of a study published in the journal Science.

“The technology reported here exploits mechanisms that have some similarities to those that cause your fingers to feel numb when cold. Our implant allows that effect to be produced in a programmable way, directly and locally to targeted nerves, even those deep within surrounding soft tissues.”

In experiments on laboratory rats, Rogers and his colleagues demonstrated that the implants can rapidly cool peripheral nerves to relieve neuropathic pain.

As thick as a sheet of paper, at its widest point the implant is 5 millimeters wide – about the size of the eraser on a pencil. One end is curled into a cuff that can softly wrap around a nerve, without the need for sutures to hold it in place.

“If you think about soft tissues, fragile nerves and a body that’s in constant motion, any interfacing device must have the ability to flex, bend, twist and stretch easily and naturally,” said Rogers.

NORTHWESTERN UNIVERSITY

To induce cooling, the device contains tiny microfluid channels. One channel contains a liquid coolant (perfluoropentane), while a second channel contains dry nitrogen. When the liquid and gas flow into a shared chamber, a reaction occurs that causes the liquid to evaporate and cool. A tiny sensor in the implant monitors the temperature of the nerve to ensure that it’s not getting too cold, which could cause tissue damage.

“As you cool down a nerve, the signals that travel through the nerve become slower and slower — eventually stopping completely,” said coauthor Matthew MacEwan, PhD, from Washington University School of Medicine in St. Louis. “We are specifically targeting peripheral nerves, which connect your brain and your spinal cord to the rest of your body. These are the nerves that communicate sensory stimuli, including pain. By delivering a cooling effect to just one or two targeted nerves, we can effectively modulate pain signals in one specific region of the body.”

An external pump allows patients to remotely activate the implant and increase or decrease its intensity. Because the device is biocompatible and water-soluble, it will naturally dissolve and absorb into the body over the course of days or weeks — bypassing the need for surgical extraction.

Other cooling therapies have been tested experimentally, but have limitations. Instead of targeting specific nerves, they cool large areas of tissue, potentially leading to side effects such as tissue damage and inflammation.

“You don’t want to inadvertently cool other nerves or the tissues that are unrelated to the nerve transmitting the painful stimuli,” MacEwan said. “We want to block the pain signals, not the nerves that control motor function and enables you to use your hand, for example.”

Walking Reduces Pain From Knee Osteoarthritis

By Pat Anson, PNN Editor

It may seem counterintuitive, but a new study suggests that walking may be the best medicine to reduce knee pain from osteoarthritis.

Nearly 40 percent of Americans over the age of 45 have some degree of knee osteoarthritis, a progressive joint disorder caused by inflammation of soft tissue, which leads to thinning of cartilage and joint damage. Osteoarthritis (OA) of the knee is not to be taken lightly, as studies have found that it is strongly associated with early death, high blood pressure, diabetes, elevated cholesterol and cardiovascular disease, particularly for women.

Moderate exercise like walking may help prevent all of those health problems.

In a multi-year study of 1,212 people over the age of 50, researchers at Baylor College of Medicine found that participants who walked for exercise at least 10 times had 40% less risk of developing frequent knee pain than non-walkers.

“Until this finding, there has been a lack of credible treatments that provide benefit for both limiting damage and pain in osteoarthritis,” said Grace Hsiao-Wei Lo, MD, assistant professor of Immunology, Allergy and Rheumatology at Baylor and lead author of the study published in Arthritis & Rheumatology.

“These findings are particularly useful for people who have radiographic evidence of osteoarthritis but don’t have pain every day in their knees,” Lo explained in a press release. “This study supports the possibility that walking for exercise can help to prevent the onset of daily knee pain.  It might also slow down the worsening of damage inside the joint from osteoarthritis.”  

Lo says walking for exercise has other health benefits, such as improved cardiovascular health and decreased risk of obesity, diabetes and even some cancers. Walking is also a free activity with minimal side effects.

“People diagnosed with knee osteoarthritis should walk for exercise, particularly if they do not have daily knee pain,” says Lo, who is chief of rheumatology at the Michael E. DeBakey VA Medical Center in Houston. "If you already have daily knee pain, there still might be a benefit, especially if you have the kind of arthritis where your knees are bow-legged.”

FTC Sues Footwear Company Over Pain Relief Claims

By Pat Anson, PNN Editor

The U.S. Federal Trade Commission has filed a lawsuit against a California footwear company, alleging it makes false claims that its shoes can relieve knee, back and foot pain. It’s the latest salvo in a long-running legal battle between the FTC and the Gravity Defyer Medical Technology Corporation.

According to the FTC complaint, Gravity Defyer and its owner, Alexander Elnekaveh, violated a 2001 order barring him from using deceptive advertising that makes unsupported scientific claims. The FTC says the company’s ads target people aged 55 and older, telling them its “pain defying footwear” made with “hybrid VersoShock technology” can relieve suffering from arthritis, joint pain, plantar fasciitis and heel spurs.

“Ignoring a prior Commission order, Gravity Defyer and its owner used false pain-relief claims to target older Americans and undercut honest competitors,” Samuel Levine, Director of the FTC’s Bureau of Consumer Protection, said in a statement. “Health-based claims require science-based proof, and faking it by misusing studies and customer reviews breaks the law.”

The 2001 FTC order stems from another company operated by Elnekave, which sold a magnetic fuel-line device that allegedly could reduce gasoline consumption by as much as 27 percent. The FTC says those claims were false and misleading.

Gravity Defyer sells an expensive line of athletic shoes, casual shoes, dress shoes, hiking shoes, boots and sandals for men and women.

They range in price from $140 for a pair of sandals to $235 for work boots.

The company sells the shoes on its website, Amazon and at retailers around the country, including The Walking Company, Hammacher Schlemmer, and Shoe City. It advertises its products on Arthritis Today and WebMD, as well as numerous other publications and websites.

Asked to comment on the FTC complaint, the company sent a statement to PNN claiming that its First Amendment right to free speech was being violated.

GRAVITY DEFYER AD

“Gravity Defyer apprised the FTC of the obvious logical flaws in its stance – and that its stance violates Gravity Defyer’s First Amendment right to disseminate, and consumers’ right to receive, truthful, non-misleading scientific information. The FTC was unrelenting in its strange position,” the company said.

In April, Gravity Defyer filed a lawsuit of its own against the FTC. Much of it hinges on a small 2017 study that the company has long used to justify its pain-relieving claims. The study, recently published the Journal of the American Podiatric Association, found that Gravity Defyer’s “shock-absorbing sole” reduces knee pain an average of 85 percent, significantly better than traditional soles.

The FTC says the study has “substantial flaws” because of its small size (52 participants) and duration (5 weeks), and because it relied on participants’ self-reported pain levels.

“It was also only designed to measure knee pain. Thus, the study was not sufficient to determine the effects of wearing Gravity Defyer’s footwear on knee, back, ankle or foot pain, or pain associated with the specific conditions claimed,” the FTC said.

The Commission, which voted 4-0 to file the complaint, is seeking an order permanently barring Gravity Defyer and Elnekaveh from making misleading or deceptive pain-relief claims, as well as civil penalties.

Injectable Gel Shows Promise as Treatment for Back Pain

By Pat Anson, PNN Editor

An experimental gel shows promise as a treatment for low back pain caused by degenerative disc disease (DDD), according to the results of a small study being presented at the annual meeting of the Society of Interventional Radiology in Boston.

Hydrogels have been used for years to treat DDD, but this is the first time that Hydrafil – an injectable gel developed by ReGelTec – has been tested on humans.

Hydrafil was injected into the discs of 20 people in Colombia with chronic DDD, who had average pain levels of 7.1 on a 10-point pain scale. None of the participants had found more than temporary, mild relief from treatments such as rest, analgesics, physical therapy and back braces.

“We really have no good treatments for degenerative disc disease, aside from conservative care,” said lead investigator Douglas Beall, MD, a medical advisor to ReGelTec and chief of radiology services at Clinical Radiology of Oklahoma.

“Surgery is statistically no more effective than conservative care and can potentially make things worse; nerve ablation is appropriate for only a few patients; and existing hydrogels are inserted through an incision as a soft solid, which can pop out of place if you’re not highly skilled in placing it.”

Because Hydrafil is injectable, it requires no incision and is minimally invasive, although patients are sedated for the procedure. Researchers heat the gel to become a thick liquid and then use a 17-gauge needle to inject it directly into the affected discs, using fluoroscopic imaging to guide them. The gel fills in cracks and tears in the disc, and then hardens, restoring the disc’s structural integrity. The procedure takes about 30 minutes.

This promotional video by ReGelTec demonstrates how Hydrafil works:

Six months after the injection, all 20 participants in the study reported significantly less low back pain, with their pain levels declining to an average of 2.0 on the 10-point pain scale. They also reported significantly better physical function.

“If these findings are confirmed in further research, this procedure may be a very promising treatment for chronic low back pain in those who’ve found insufficient relief from conservative care,” said Beall. “The gel is easy to administer, requires no open surgery, and is an easy procedure for the patient.”

In 2020, Hydrafil received the FDA’s breakthrough device designation, which allows for an expedited review of an experimental product when there is evidence it provides more effective treatment than current options.

ReGelTec is currently recruiting 50 people with DDD in Canada for a new clinical trial of Hydrafil.

Degenerative disc disease is one of the leading causes of chronic low back pain. Healthy discs cushion the spine’s vertebrae, facilitating movement and flexibility. But with activity and normal aging, discs can wear out and cause the bones of the spine to rub together and pinch nerves, causing pain and numbness. By age 60, most people have at least some disc degeneration in their spines.

Why Intractable Pain Treatment Requires a Stimulant

By Dr. Forest Tennant, PNN Columnist

In 1896, Dr. Henry Snow was the chief cancer surgeon at the Royal Brompton Hospital in London. He recognized and agonized over the immense pain and suffering of his patients when they developed constant pain and approached their end of life.

Dr. Snow wanted to relieve their suffering, so he administered the drugs that were available one at a time: morphine, cocaine and alcohol. With each he managed to get some pain relief, but didn’t obtain the relief he wanted and patients were still suffering. Not to be deterred, he made a profound discovery.

Dr. Snow mixed morphine and cocaine in liquid alcohol and administered the solution to his patients. Then he found formidable and humane pain relief. This three-drug mixture gave rise to the concept of “synergy of constituents,” which means that the simultaneous administration of multiple pain-relieving drugs added up to more than each one alone. In other words, two and two equaled six rather than four. 

The success of Dr. Snow’s discovery spread rapidly to other hospitals and countries, and became known as the “Brompton cocktail.” In France and elsewhere, physicians discovered they could add an antihistamine, antipsychotic or cannabis oil to the mixture and get even more pain relief.  

The Brompton cocktail was used until the 1970’s, when it gave way to the convenience of opioid tablets, capsules and injections, rather than the time and cost of making a liquid that contained multiple drugs. 

The Amphetamine Discovery 

Fortunately, after the demise of the Brompton cocktail, a handful of researchers weren’t about to forget the “synergy of constituents” and the pain-relieving potency of stimulants like cocaine. An example of the pain-relieving capability of stimulants is caffeine, which in the 1960’s was added to a variety of pain relievers such as aspirin and codeine to obtain synergy. 

Amphetamine was discovered in the 1930’s and promoted as “Benzedrine” to stay awake while driving. Because amphetamine produced alertness, it became known as a stimulant. Clinical reports began to surface in the 1940’s that amphetamine and its derivatives also helped depression, weight loss, mental alertness, hyperactivity and attention span. They soon began to be marketed and labeled for those conditions.  

Clinical studies on amphetamine derivatives for pain relief were finally started in the 1980’s, and they clearly showed that they provided a great deal of pain relief.  

By the time the last century folded, a core of pain researchers knew that not only cocaine but amphetamine derivatives such as methylphenidate and phentermine relieved pain. What they didn’t know was why. This answer was to come 15-20 years later. 

Stimulants Initially Rejected 

I became quite excited about the clinical trials that showed stimulants relieved pain, and in the late 1990’s gave a group of intractable pain patients the weak stimulant and weight loss drug phentermine, in combination with clonidine. The opioid dosages for these patients dropped 40 to 50 percent within six weeks and they got even better pain relief.

I presented my findings to colleagues at some national professional meetings. Much to my surprise, I was summarily informed that the new long-acting opioid formulations of the fentanyl patch (Duragesic), oxycodone (Oxycontin), morphine (MS Contin) and the implanted intrathecal (spine) opioid pump eliminated any need for stimulants or the concept of “synergy of constituents.”

By the turn of the century, the use of these new long-acting opioids and implanted opioid pumps became the standard of the day. Stimulants and their synergy were essentially forgotten, and they were rarely used for intractable pain again until about 2010. 

The Rebirth of Synergy 

After the year 2000, I don’t recall ever being referred an intractable pain patient who had not already been started on one of the long-acting opioids and/or an implanted opioid pump. They were referred to me simply because they were not getting adequate pain relief. Almost every one of these patients had found that their opioids quit working well, regardless of dosage or even if a second or third opioid was added to the mix.  

Somewhat out of desperation, about 12 years ago I recalled Dr. Snow, the Brompton cocktail and the “synergy of constituents.” I also remembered my study on phentermine and clonidine, so I started giving patients on opioids who were doing poorly my favorite stimulant, phentermine, or occasionally methylphenidate (Ritalin).  

Later the narcolepsy drug modafinil (Provigil) and a mixture of amphetamine salts (Adderall), came on the market. They too proved to be excellent “synergists” with opioids. I found that every intractable pain patient who received one of these stimulants not only got better pain relief and were either able to “hold the line” or reduce their opioid dosage.  

Phentermine continued to be my favorite stimulant to relieve pain and reduce the use of opioids because it additionally kept weight down and helped the patient keep moving and functional. 

Why Stimulants Work 

Although stimulants have been clinically known to relieve pain since Dr. Snow’s experiments in 1896, researchers didn’t provide us with the biologic “why” until recently. 

In the past decade, some outstanding researchers determined that there are about half a dozen different neurotransmitters in the brain and spinal cord that relieve pain. The three major neurotransmitters are endorphin, dopamine and gamma amino butyric acid (GABA). These neurotransmitters relieve pain by activating trigger points in the central nervous system called receptors. 

These astute researchers also determined that intractable pain may deplete endorphin, dopamine and GABA. Consequently, a substitute drug may have to be administered to obtain adequate pain relief.  

If you have constant, intractable pain, you may likely need the “synergy of constituents,” which will include an opioid, stimulant, and GABA substitute. Popular GABA substitutes include diazepam (Valium), carisoprodol (Soma), pregabalin (Lyrica), gabapentin (Neurontin), clonazepam (Klonopin), topiramate (Topomax) and alcohol. 

Which Patients Should Receive a Stimulant?

Stimulants have well-known abuse and addiction potential, so they should only be given to patients who have a well-documented disease or injury that is known to cause severe intractable pain. The most common diseases in this category are adhesive arachnoiditis, stroke or head trauma, reflex sympathetic dystrophy (RSD/CRPS), Ehlers-Danlos syndrome, and some autoimmune-collagen disorders.  

In most cases, patients who need a stimulant are clearly debilitated and require some family and caretaker support to function and carry out activities of daily living.  

Intractable pain patients have several dopamine substitutes available: 

• Amphetamine Salts (Adderall)

• Methylphenidate (Ritalin)

• Dextroamphetamine

• Phentermine

• Phendimetrazine

Misunderstood Objections

Many medical practitioners are not yet aware of the new research on stimulants and hesitate to prescribe them, even to needy, legitimate patients. The fear of abuse, diversion or dependence by the intractable pain or palliative care patient, while understandable, should not cause reluctance to prescribe a stimulant to these patients. No intractable pain patient will give away something that works so well.

In addition, the dosage of stimulants for pain relief is considerably lower than the usual level needed for abuse. Only small dosages are clinically needed in most cases and pharmacies today only issue limited quantities. Another safety factor in controlling adverse consequences of stimulants is that the severe intractable pain patient will usually have close family or caretaker support who can safely store and administer stimulants.

There is an unfounded fear of hypertension if a stimulant is prescribed. This is rarely the case, since the pain patient is dopamine deficient. A stimulant drug in an intractable pain patient may actually lower blood pressure since it may be elevated due to pain.

There is the belief that Adderall, Ritalin and some other stimulants are only for attention deficit hyperactivity disorder (ADHD). What is misunderstood is that ADHD is universal among intractable pain patients. Every person with intractable pain has reduced attention span, hypertension and agitation. One could argue that every intractable pain patient should be on a stimulant just for their ADHD. 

Dr. Snow and the Royal Brompton Hospital had the right idea. The severe, intractable pain patient needs an opioid to replace endorphin, a stimulant to replace dopamine, and a substitute for GABA.  

It’s time we bring back the “synergy of constituents” to humanely get better pain relief and simultaneously lower opioid dosages in the intractable pain patient. 

Forest Tennant, MD, DrPH, is retired from clinical practice but continues his studies on the treatment of intractable pain through the Arachnoiditis Research and Education Project. A bibliography on stimulants for intractable pain treatment can be found here  

The Tennant Foundation gives financial support to Pain News Network and sponsors PNN’s Patient Resources section.   

Virtual Reality Shows Long Term Benefits for Chronic Low Back Pain

By Pat Anson, PNN Editor

Critics of virtual reality therapy often say it’s a poor treatment for chronic pain because it only distracts patients from their pain and that the effects are temporary, at best.

But new research suggests that the benefits of virtual reality (VR) can last six months after treatment has stopped – at least for patients with chronic low back pain.

The study, published in the Journal of Medical Internet Research, followed 188 people with chronic low back pain who had an average pain intensity score of 5 on a zero to 10 point scale.

Half the participants were given an EaseVRx headset to watch 3-D programs daily for 8 weeks, immersing themselves in a “virtual” environment where they can swim with dolphins, play games or enjoy beautiful scenery. The goal is help patients learn how to manage pain through cognitive behavioral therapy.  

The other patients also used the EaseVRx headset, but only watched routine nature scenes as a placebo or sham VR treatment.  

JOURNAL OF MEDICAL INTERNET RESEARCH

Patients were followed for six months after treatment was stopped. Participants in both groups reported improvement in their pain and other symptoms six months after treatment, but the improvements were more significant in those who received VR therapy. Pain intensity was 31% lower for patients in the VR group, compared to 16% in the sham group. Physical function, mood, sleep and pain-related interference in activity were also better in those who received VR therapy. No adverse side effects were reported in either group.

“We have been pleasantly pleased and surprised that patients are maintaining clinically meaningful changes in pain intensity and interference 6 months after returning the device. It appears people are actually acquiring skills in a relatively short period that they continue to retain/apply months after treatment,” said Josh Sackman, co-founder and president of AppliedVR, which makes the EaseVRx headset.

AppliedVR is planning more research to see how patients respond long-term to VR treatment. A brain imaging study is being conducted to measure brain activity before, during and after treatment. Patients are also being recruited for a large clinical trial to see how VR therapy impacts pharmacy and medical claims.  

“In order to drive real acceptance, we are committed to extensive research to address any skepticism people may have,” Sackman told PNN.

The EaseVRx headset was given a Breakthrough Device Designation by the FDA in 2020 for fibromyalgia and low back pain. Last year the agency authorized the marketing of the headset for chronic low back pain in adults, the first medical device of its kind to receive that designation.

EaseVRx headsets are currently being used for pain management in over 200 hospitals and healthcare systems. A full commercial launch for home-based use is not expected until next year.

Experimental Ketamine Pill Effective in Treating Acute Pain

By Pat Anson, PNN Editor

An experimental oral tablet that combines ketamine with aspirin was nearly as effective as an opioid in treating acute pain in emergency room patients, according to the results of a small pilot study.

Ketamine is a non-opioid analgesic that is also used to treat anxiety and depression. The drug is so potent, that it is usually administered by an infusion, injection or nasal spray under strict medical supervision. Some doctors and patients have also found ketamine effective as a treatment for certain chronic pain conditions.

“Ketamine has long been viewed as a highly promising analgesic, but its adverse effect profile, available routes of administration, and short-lasting effects limited its use. Our goal is to overcome all three of these limitations,” says Joseph Habboushe, MD, an emergency room physician and founder of Vitalis Analgesics.

Vitalis has developed a proprietary formulation of aspirin that delivers faster and stronger pain relief than traditional aspirin. The company is working to see if a combination of its aspirin with low-dose ketamine could be used to treat pain.

In the pilot study at Maimonides Medical Center in New York, 25 emergency room patients with acute musculoskeletal pain were given the ketamine-aspirin pill – called VTS-85. After an hour, their pain level scores were reduced an average of 3.8 points, pain relief similar to that of oxycodone-acetaminophen (Percocet) formulations, which reduced pain levels by 4.0 points in previous studies.

Researchers say the pain relief from VTS-85 lasted for two hours, with pain scores dropping an average of 4.4 points. Notably, only 4-8% of patients experienced the dissociation and sedation that is usually experienced when ketamine is administered intravenously.

“The results of this pilot study are highly encouraging, with pain reduction similar to studies using IV ketamine formulations but lasting longer and with lower side effects, and it’s oral,” said Habboushe.

The study findings are published in The Journal of Emergency Medicine.

“If proven in larger controlled trials, this could represent a breakthrough in the treatment of acute pain and a range of other indications,” said lead investigator Sergey Motov, MD, Department of Emergency Medicine, Maimonides Medical Center.

Vitalis has completed a second larger trial on the use of VTS-85 in emergency room patients, but the results have not yet been released. The company is also studying VTS-85 as a treatment for acute headache and postoperative pain. The ketamine-aspirin pill will require a prescription if approved by the FDA.

Can ‘Medical Food’ Treat Chronic Pain?

By Pat Anson, PNN Editor

Do you keep a supply of gamma-aminobutyric acid in your medicine cabinet? What about hydroxytryptophan? Or the ominous sounding devil’s claw root?

They’re not exactly household names to the average person, but to Fabio Lanzieri they are essential ingredients in a new “medical food” product called Proleeva, a dietary supplement he developed that contains a blend of a dozen natural herbs, enzymes and amino acids.

“I fervently believe that prescription medications are very beneficial to man, but I also believe that nature does offer us the ability to find solutions to natural diseases. Because of this, I was always interested and read a lot about vitamins, supplements and bioflavonoids,” says Lanzieri, who spent nearly four decades in the pharmaceutical industry. “I believe that supplementing prescription medications with natural substances is the best way of treating chronic pain or any disease state.”

Several years ago, Lanzieri’s wife Maria began experiencing joint pain as a side effect of taking a hormone suppressant to help her recover from breast cancer.     

“I did start feeling the pain in my joints, particularly my fingers. I was having a really hard time sometimes just opening a bottle or doing simple things,” Maria told PNN.

To help his wife, Lanzieri began experimenting with different blends of herbs and other natural substances. Some, like ginseng and curcumin, have been used for centuries as natural remedies for pain and inflammation. Others, like choline bitartrate and L-arginine, have only recently been recognized as essential nutrients that help restore amino acids and neurotransmitters to healthy levels.

You can buy all of these supplements individually, but Lanzieri combined them all into one proprietary formula and gave it to Maria. Her joint pain slowly began to improve.

“After about a month, month and a half, I started having relief of those symptoms.  I didn’t have the joint pain. I felt like I could do a lot of those tasks that I couldn’t do before,” Maria said. “At one point I stopped taking it and it then was all coming back. It was weird. I didn’t think it was the Proleeva. I didn’t associate it with that. But then I went back on it and suddenly I was not feeling it again.”

The Lanzieri’s began sharing Proleeva with family and friends, who also reported positive results.

Only recently have they begun selling Proleeva to the general public on their website and through Amazon, marketing it as “the ultimate comfort food” that “helps bring your nervous system back into balance.”

A Proleeva bottle contains 120 capsules – about a month’s supply – and costs $40.

“I’ve been taking Proleeva for the last seven years and I don’t have any inflammation. I take it because it balances the body with the right ingredients that it needs to fight to heal itself,” says Lanzieri. “Your body needs amino acids and they are not reproduced naturally in the body. And over time, the older we get, the less we have of those amino acids. And therefore, we have to supplement them.”

For now, there is only anecdotal evidence to support these health claims, although a small clinical trial of Proleeva is underway.  Unlike pharmaceuticals, dietary supplements are only loosely regulated by the Food and Drug Administration, allowing supplement makers to introduce new products and make health claims without substantial evidence that they work.

‘One Formulation Makes a Lot of Sense’

Dr. Forest Tennant is intrigued by Proleeva. An expert in treating intractable pain, Tennant recommends that pain patients take gamma-aminobutyric acid (GABA), herbs and other supplements as part of their medical treatment to restore damaged nerve tissue and relieve pain.

“Having a lot of different supplements in one formulation actually makes a lot of sense, because we’re not certain which ones are going to work,” says Tennant. “But I do think there is some urgency or necessity in people with pain taking a variety of these supplements. They can’t hurt themselves and they probably are going to benefit themselves.

“And this particular product is doing something else. It recognizes that it’s got stuff in there like GABA that stimulates the nerve receptors that provide pain relief.”  

Tennant says the supplement industry has become more innovative than the pharmaceutical industry – particularly in an age when opioids and some other medications are harder to get.

“I think the innovation is really great,” Tennant said. “I really think that anyone who has chronic pain, particularly constant pain, really needs to be on a number of supplements right now. We’ll figure out exactly which ones work the best later, but right now I think taking a combination of these things is worthwhile.”

People who try Proleeva or other supplements should not expect instant results. It may take up to a month to feel any benefits.

“The biggest problem is making them stay with this for 30 days. We’re a society of instant gratification. Prescription drugs do that. But unfortunately, natural substances take time,” says Lanzieri.

Lipofilling Improved Pain and Function in Patients with Finger Osteoarthritis

By Pat Anson, PNN Editor

People who suffer from painful arthritic fingers have few treatment options to choose from. They can wrap their hand in a splint, take anti-inflammatory drugs or get steroid injections into their finger joints – all of which provide only temporary relief. More invasive surgical treatments include joint fusions or reconstruction, which can impair hand motion and take weeks to recover from.

German researchers have found that a less invasive treatment commonly used in plastic surgery – injecting fat tissue from one part of the body into another -- can provide lasting improvements in pain and function for patients with finger osteoarthritis. The technique – called lipofilling – resulted in “highly significant clear improvement" with no complications in a small pilot study of 15 patients.     

"We believe that for our patients the reduction of pain represents the most striking and important result, which also has the most pronounced and highly significant effect," said co-author Max Meyer-Marcotty, MD, Clinic for Plastic, Reconstructive, and Aesthetic Surgery/Hand Surgery in Lüdenscheid, Germany.

"Even over a long-term follow-up, the transfer of fatty tissue to arthritic fingers joints appears to provide a safe and minimally invasive alternative to conventional surgery for patients with osteoarthritis.”

In the lipofilling procedure, Meyer-Marcotty and his colleagues used liposuction to take a small sample of each patient's fatty tissue from their upper thigh or hip area. The autologous fat was then injected into their arthritic finger joints. Patients wore a splint around the treated fingers and took pain relievers for a week. There were no infections or other complications reported.

The researchers followed outcomes in 25 finger joints for an average of 44 months after treatment, and found that pain scores fell from a median of 6 (on a 10-point scale) before treatment to just 0.5 points at follow-up. Grip strength of the treated fingers approximately doubled, while fist closure and hand function performing everyday tasks also improved.

“Even after a follow-up examination period of 44 months, the transfer of fatty tissue to arthritic finger joints has shown itself to be a minimally invasive, safe, and promising alternative to conventional surgical techniques aimed at alleviating arthritic complaints, and one that among other things entails a highly significant improvement in postsurgical pain levels,” researchers reported in the journal Plastic and Reconstructive Surgery. “Further long-term follow-up studies of even larger patient cohorts would be needed to further corroborate these initial positive findings.”

In recent years, lipofilling procedures have been increasingly used in plastic and reconstructive surgery, as well as stem cell therapy.

When injected into patients, mesenchymal stromal cells (MSCs) in fat tissue can regenerate damaged or diseased tissue, including cartilage in arthritic joints. A small 2019 study found that MSCs collected from a patient’s bone marrow can significantly reduce pain from knee osteoarthritis for up to a year.

Osteoarthritis is a progressive joint disorder caused by the inflammation of soft tissue, which leads to thinning of cartilage and joint damage in the knees, hips, fingers and spine.

"The chance to preserve the joint with a minimally invasive procedure is of particular interest in the early, albeit painful, phases of finger osteoarthritis," said Meyer-Marcotty. "Since the lipofilling procedure is nondestructive, conventional joint surgery can still be performed later, if needed."

High-Frequency Spinal Cord Stimulators Provide More Pain Relief

By Pat Anson, PNN Editor

Spinal cord stimulators are often considered the treatment of last resort for patients with intractable or severe chronic pain. The surgically implanted devices emit low levels of electricity that reduce pain signals, but have high failure rates and often have to be removed because they’re ineffective, cause infections or need new batteries.

Two new studies suggest there are ways to improve the success rate of spinal cord stimulators (SCS) through improved patient selection and the use of high-frequency devices.

Low-frequency SCS (50 Hz) was first approved by the Food and Drug Administration for intractable back and leg pain in 1989. Six years later, the FDA approved high-frequency devices (10,000 Hz), that deliver pulses of electrical stimulation that are shorter in duration, lower in amplitude and do not cause paresthesia, an irritating sensation of tingling or prickling.

In a retrospective study of 237 patients who received stimulators between 2004 and 2020, researchers at the University of California San Diego School of Medicine reported that high-frequency devices were more effective at reducing pain and opioid use than low-frequency ones.

The study findings, published in the journal Bioelectronic Medicine, also show that male patients benefit more than women from high-frequency neuromodulation.

"Our work was sparked by a growing literature that demonstrate sex specific immune pathways differentially contribute to chronic pain processes," said senior author Imanuel Lerman, MD, an associate professor of anesthesiology at UC San Diego Health. "The observed parameter-specific (high versus low frequency) sex-based differences in spinal cord stimulation efficacy and opiate use are definitely intriguing.”

It’s not clear why men benefit more than women, but researchers believe it may be due to the male hormone testosterone having a modulating effect on pain signals. The sex differences may also be due to males and females processing chronic pain differently.

"Clearly more work needs to be done to carefully characterize sex specific pain regulatory pathways that may prove responsive to specific types of neuromodulation and or pharmaceutical therapies," said Lerman.

Improved Patient Selection  

Although most patients are required to undergo psychological testing and a trial treatment before getting a SCS, failure rates for the devices remain high at around 25 to 30 percent. With about 50,000 stimulators implanted in the U.S. every year, that means thousands of patients are getting poor results.

To improve patient outcomes, researchers at Florida Atlantic University developed machine-learning algorithms to help predict which patients may benefit from SCS. Working with a cohort of 151 SCS patients, they evaluated 31 features or characteristics in each patient.  

Researchers found two distinct clusters of patients which differ significantly in age, duration of chronic pain, preoperative pain levels and pain catastrophizing scores. They used computers to fine-tune the results, identifying the 10 most influential features that contribute the most to a successful SCS implant.

Results of the study, published in the journal Neurosurgery, demonstrate for the first time the ability of machine-learning algorithms to predict long-term patient response to SCS placement. The next step is to validate the data in future patients to ensure that the algorithm is useful in real-world situations, not just computer models.

"Our study resulted in the development of a model to predict which patients would benefit from spinal cord stimulation," said lead author Julie Pilitsis, MD, dean and vice president of medical affairs at Florida Atlantic University's Schmidt College of Medicine.  "After we validate this work, our hope is that this machine-learning model can inform a clinical decision support tool to help physicians better choose which patients may be most appropriate."

SCS is no longer limited to patients with intractable back and neck pain. Last year the FDA expanded the use of SCS to include lower limb pain from diabetic neuropathy.  Stimulators are also being used on patients with Complex Regional Pain Syndrome (CRPS).

A decision to get a SCS shouldn’t be taken lightly. A 2018 study by a team of investigative journalists found that stimulators have some of the worst safety records of medical devices tracked by the FDA. A 2020 FDA review of adverse events involving SCS found that nearly a third were reports of unsatisfactory pain relief. The review also identified nearly 500 deaths linked to the devices, along with nearly 78,000 injuries and 30,000 device malfunctions.

Low Fat Vegan Diet Reduces Rheumatoid Arthritis Pain

By Pat Anson, PNN Editor

A small new study found that a low-fat vegan diet can help improve joint pain in patients with rheumatoid arthritis – the latest research to show that healthier diets can significantly reduce pain levels. Study participants also lost weight and lowered their cholesterol levels by eliminating their consumption of animal fats and inflammatory foods.

Rheumatoid arthritis (RA) is a progressive and incurable disease in which the body’s immune system attacks joint tissues, causing pain, inflammation and bone erosion.

“A plant-based diet could be the prescription to alleviate joint pain for millions of people suffering from rheumatoid arthritis,” says lead author Neal Barnard, MD, president of the Committee for Responsible Medicine. “And all of the side effects, including weight loss and lower cholesterol, are only beneficial.”

Thirty-two people diagnosed with RA from the Washington DC area completed the study after being assigned to one of two groups for 16 weeks.

The first group followed a vegan diet for four weeks, eliminating their consumption of meat, dairy products and eggs. During weeks 5 through 7, the diet was further restricted to eliminate gluten-containing grains, as well as potatoes, chocolate, nuts, citrus, onions, tomatoes, bananas, apples and coffee.

Vegan foods that participants were encouraged to eat included rice, oats, quinoa, broccoli, kale, collards, Brussels sprouts, squash,  carrots, apricots, blueberries, plums, lentils and beans. There were no restrictions on calories or how often they ate.

After week 7, the excluded foods were reintroduced, one at a time, every 2 days. Any food that was associated with pain or other symptoms upon reintroduction was eliminated

The second group followed an unrestricted diet but were asked to take a daily placebo capsule.  After 16 weeks, the groups switched diets.

The study findings, published in the American Journal of Lifestyle Medicine, showed a significant reduction in pain and inflammation during the vegan stage of the study. Participants lost an average of two points in their Disease Activity Score-28 (DAS28), which measures swollen joints, joint tenderness and C-reactive protein levels – a marker for inflammation. DAS28 levels typically increase with rheumatoid arthritis severity.

The average number of swollen joints decreased from 7.0 to 3.3 in the vegan phase, while increasing slightly for participants in the placebo phase.

In addition to reductions in pain and swelling, participants lost an average of 14 pounds on the vegan diet, compared with a gain of about 2 pounds on the placebo diet. There were also greater reductions in total, LDL, and HDL cholesterol during the vegan phase.

Notably, although participants were asked not to alter or reduce their use of medication during the study, several of them did so – in most cases because they felt less need for them.

“In conclusion, the current study suggests that a low-fat vegan diet eliminating specific foods, without fasting and without caloric restriction, may improve joint pain. Additional studies are needed in which the diagnosis is confirmed by independent observers and medications remain stable in a larger sample,” said Barnard.

Many previous studies have shown an association between healthy diets and lower pain levels. Gluten-free diets have been shown to improve symptoms of fibromyalgia and neuropathy, while Mediterranean diets rich in anti-inflammatory foods lower the risk developing chronic pain. And diets that include lots of fatty fish and less processed food reduce the frequency and severity of migraines.

One of the strictest diets of all – a very low energy diet (VLED) that limits people to just 800 calories a day – was recently found to significantly reduce fibromyalgia pain after just three weeks.

Tiny Experimental Implant Could Treat Neuropathic Pain

By Pat Anson, PNN Editor

A tiny wireless implant that stimulates peripheral nerves from within blood vessels shows potential as a treatment for neuropathic pain, according to a proof-of-concept study by a team of Texas researchers published in the journal Nature Biomedical Engineering.

The implants have only been tested in laboratory animals, but researchers say they could replace larger and more invasive devices currently used to treat Parkinson’s disease, epilepsy, chronic pain, hearing loss and paralysis.

The MagnetoElectric Bio ImplanT -- ME-BIT for short -- is slightly larger than a grain of rice. It’s designed to be placed in a blood vessel near the nerve targeted for stimulation. The implant requires no surgery or batteries, and draws its power and programming from an electromagnetic transmitter worn outside the body.

“Because the devices are so small, we can use blood vessels as a highway system to reach targets that are difficult to get to with traditional surgery,” said lead author Jacob Robinson, PhD, Associate Professor of Electrical and Computer Engineering at Rice University.

RICE UNIVERSITY

“We’re delivering them using the same catheters you would use for an endovascular procedure, but we would leave the device outside the vessel and place a guidewire into the bloodstream as the stimulating electrode, which could be held in place with a stent.”

The ability to power the implant remotely eliminates the need for electrical leads through the skin and other tissues. Leads used for devices like pacemakers can cause inflammation and sometimes need to be replaced. Battery-powered implants may also require additional surgery to replace the batteries.

Researchers say ME-BIT’s wearable charger could even be misaligned by several inches and still provide sufficient power and programming to the implant, without irritating surrounding tissues.

“We’re getting more and more data showing that neuromodulation, or technology that acts directly upon nerves, is effective for a huge range of disorders – depression, migraine, Parkinson’s disease, epilepsy, dementia, etc. – but there’s a barrier to using these techniques because of the risks associated with doing surgery to implant the device, such as the risk of infection,” said co-author Sunil Sheth, MD, Associate Professor of Neurology and director of the Vascular Neurology Program for McGovern Medical School at UTHealth Houston.

“If you can lower that bar and dramatically reduce those risks by using a wireless, endovascular method, there are a lot of people who could benefit from neuromodulation.”

Electrical stimulation can reduce pain when doctors target the spinal cord and dorsal root ganglia (DRG), a bundle of nerves that carry sensory information to the spinal cord. But existing DRG stimulators require invasive surgery to implant a battery pack and pulse generator.

By using blood vessels, researchers say they can place the ME-BIT implant strategically in a minimally invasive way and have more predictable outcomes.

“One of the nice things is that all the nerves in our bodies require oxygen and nutrients, so that means there’s a blood vessel within a few hundred microns of all the nerves,” Robinson explained. “With a combination of imaging and anatomy, we can be pretty confident about where we place the electrodes.

In a previous study, Robinson and his colleagues demonstrated the viability of the implants by placing them beneath the skin of laboratory rodents that were fully awake and free to roam about their enclosures. The rodents preferred to be in parts of the enclosures where a magnetic field activated the implant, which provided a small voltage to the reward center of their brains.

Researchers need to conduct more animal studies and eventually human trials before seeking FDA approval for the implants.

“We’re doing some longer-term studies to ensure this approach is safe and that the device can stay in the body for a long time without causing problems,” said Sheth, who estimates the process will take a few years.