Descending Pain: A New Way to Control Severe Chronic Pain
/By Dr. Forest Tennant and Ingrid Hollis
The control of severe chronic pain in medical practice today is almost exclusively based on “ascending” or “neuropathic” pain:
Ascending pain occurs when a pain signal is transmitted from the site of injury or disease up the spinal cord to the brain. Neuropathic pain is the pain that results when there is damage or dysfunction of nerve tissue in the brain, spinal cord or peripheral nerves.
In recent years, researchers discovered that when chronic pain centralizes, it creates a third type of pain called “descending” pain. This is a critical issue for persons with adhesive arachnoiditis and other diseases that cause severe chronic pain, because descending pain requires different medications than those used for ascending and neuropathic pain.
A person with constant pain will produce excess bioelectricity (central sensitization or centralized pain) in the glial cell matrix of the brain. This bioelectricity “descends” or travels down the spinal cord and vagus nerve. It not only produces pain, but over-stimulates the cardiovascular system.
Descending pain is controlled by the noradrenergic receptor. The neurotransmitter to this receptor is called noradrenalin or norepinephrine.
Symptoms of Descending Pain
Descending pain will be present in persons who have constant, unremitting pain. Here are the symptoms:
Pulse rate elevates
Periodic hot flashes
Cold hands/feet
Excess sweating
Allodynia (pain upon light touch)
Over-Reliance on Opioids and Neuropathic Agents
The lack of awareness about descending pain is one reason why high doses of opioids and neuropathic agents (i.e., gabapentin, diazepam) may be over-prescribed. Physicians may simply raise the opioid or gabapentin dosage if they are not aware that the cause is descending pain. What’s more, the increase in dosage may be ineffective or even harmful.
This also applies to opioids in implanted pumps. Countless persons have been treated with an implanted device or “pain pump” with the erroneous belief that no medication, except intrathecal opioids, are needed. Patients with these devices soon learn that their pain is poorly controlled by opioids alone.
Opioids and neuropathic agents have little effect on descending pain. It must be treated separately.
Pain treatment and relief are based on a medicinal that activates or stimulates a specific receptor (think “action point”) that is present in nerve cells in the brain, spinal cord or peripheral nervous system. Here is how the three types of pain and their receptors can be treated:
Ascending pain needs to be treated with medications that activate the endorphin or opioid receptor.
Neuropathic pain control depends on activation of a receptor called gamma amino butyric acid (GABA).
Descending pain control must activate the norepinephrine (noradrenalin) receptor.
To achieve good control of severe, chronic or intractable pain, all three of these receptors must be simultaneously activated. Severe chronic pain is commonly undertreated, because all three receptors are not simultaneously activated.
Medication Classes for Descending Pain
Three medication classes are used to treat descending pain. Medical practitioners and patients have choices, and can experiment to help decide which medications and supplements bring the most comfort.
Bioelectric Blockers: Tizanidine, propanolol, clonidine, tapentadol (Nucynta).
Receptor Activators: Modafanil (Provigil), methylphenidate (Ritalin), dextroamphetamine, amphetamine salts (Adderall), phentermine, lisdexamfetamine (Vynanse). Non-prescription activators: lion’s mane, mushroom extract, St. John’s wort, rhodiola, mucuna, whole adrenal gland.
Precursor (Amino Acids) of Noradrenaline: Phenylalanine at 1,000 to 2,000mg a day. Tyrosine at 1,000 to 2,000mg a day.
When not controlled, chronic pain, inflammation and autoimmunity will deplete a number of neurotransmitters and hormones. When that happens, noradenaline (norepinephrine) will often be depleted.
Supplements of either amino acids (phenylalanine or tyrosine) and daily protein intake may help reduce both background and flare pains. Phenylalanine and/or tyrosine need not be taken every day, but they are highly recommended at least two days a week. They can and should be taken with a bioelectric blocker or receptor activator.
Noradrenergic receptor activators do not raise pulse rate or blood pressure in a constant pain patient like they do in a normal person. They may actually lower blood pressure and pulse rate. That’s because chronic pain, inflammation and autoimmunity deplete noradrenalin.
One medication, tapentadol (Nucynta), is both an opioid and norandrenergic blocker. It is highly recommended.
Descending pain is a new discovery that must be recognized and controlled to achieve relief from severe chronic pain. A sole reliance on opioid and neuropathic agents may often provide inadequate pain relief.
To learn more about descending, ascending and neuropathic pain, you can watch a recent episode of DocToks with Dr. Forest Tennant and Friends.
Forest Tennant, MD, DrPH, is retired from clinical practice but continues his research on the treatment of intractable pain and arachnoiditis. Readers interested in learning more about his research should visit the Tennant Foundation’s website, Arachnoiditis Hope. You can subscribe to its bulletins here.
Ingrid Hollis is a person in pain, patient advocate, and advisor to the Tennant Foundation.
The Tennant Foundation gives financial support to Pain News Network and sponsors PNN’s Patient Resources section.