By Dr. Forest Tennant, PNN Columnist

Unexpected and sudden death commonly occur in persons who have poorly controlled pain caused by Intractable Pain Syndrome (IPS). Many persons with IPS who have died unexpectedly have been falsely accused of an “overdose” because drugs were found in their body fluids at autopsy. In reality, the cause was almost always cardiac arrest, hypoglycemia or adrenal failure.

Cardiac Arrest

Pain flares during cardiac arrest may cause the adrenal glands to pump out so much adrenalin that their blood pressure and pulse rate jump up dramatically. This causes blood vessels, including the coronary arteries and those in the brain, to constrict and shut off blood flow. The result may be a heart attack, stroke or arrhythmia.

Chronic, recurrent coronary constriction may cause heart pain called “angina.” A person with IPS who has their medications, usually opioids or benzodiazepines, reduced too rapidly is very prone to cardiac arrhythmia and cardiac arrest.

Hypoglycemia

Insulin is normally made and secreted by the pancreas to lower blood sugar in order to digest food and stabilize metabolism. In times of pain, cortisol and blood sugar are raised. When this occurs, insulin is pumped out by the pancreas to heal injured or damaged tissues. Too much insulin caused by a pain flare can force blood sugar to drop to such a low level – a condition known as hypoglycemia -- that death may occur.

The long-term effect of constant pain on the pancreas is an insulin deficiency, so high blood sugar levels (diabetes) are regularly found in persons with IPS.

Adrenal Failure

Uncontrolled constant pain may exhaust the adrenal glands to a point that the hormone cortisol drops too low, causing Addison’s disease or adrenal insufficiency. Symptoms such as darkened skin, abdominal pain and weakness usually appear slowly, but if there’s rapid onset of symptoms it could lead to adrenal failure and death.

Addison’s Disease is named after Dr. Thomas Addison, who described 11 cases of adrenal failure in 1855. About half his cases had histories of severe pain. Persons who die of adrenal failure often do so in their sleep.

Many persons with IPS have unexpectedly and suddenly died and have been falsely accused of drug overdose. To prevent sudden death, persons with IPS must be in a pain treatment program that is balanced and doesn’t rely just on just one or two medications.

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 Intractable Pain Syndrome Research and Education Project.

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