WHAT IS ACUPUNCTURE FOR PAIN MANAGEMENT?
Acupuncture is a complementary therapy that is being increasingly used in the day-to-day management of pain. It originated in China, over 3000 yr ago and is practised worldwide. While acupuncture does indeed have an ancient history, it has become both accepted and prescribed as an effective treatment for many painful conditions.
Both the National Institutes of Health and the World Health Organization has acknowledged acupuncture as an effective treatment modality for conditions involving pain and nausea.
The principle behind acupuncture involves a type of energy called qi. The qi flows along acupuncture channels or meridians of the body. There are 12 meridians on the body that are divided into two groups—yin and yang, representing masculine and feminine. There are three yang meridians of the upper extremities, three yang meridians of the lower extremities, three yin meridians of the lower extremities, and three yin meridians of the upper extremities. There are eight additional meridians that are not designated yin or yang. Block ages and imbalances in the flow of qi result in disease and symptoms. The flow of qi can be corrected by inserting fine needles at specified points along the meridians.
Acupuncture was first in the spotlight of the U.S. public in 1971. A New York Times reporter named James Reston was covering Henry Kissinger on a trip to China in 1971 and fell ill to acute appendicitis. His appendix was removed in a modern Chinese hospital using general anesthesia. However for his post-surgical pain he was offered and accepted acupuncture to help alleviate his symptoms. He wrote an article in the NY Times July 25th 1971 detailing his experience.
Types of Acupuncture for Pain Management
Single use, sterilized, disposable needles are used which are then inserted to a depth of 4–25 mm and left in place for a period of time (approx. 30 minutes). There are often 6–12 needles (and sometimes more) inserted at different acupoints at the same time. The sensation is often described as a tingling or dull ache at the entry point. It is important to note acupuncture needles are solid and very thin which allows them to slide into the skin without pulling epidermis or foreign material into the body. The process of the treatment is typically not painful; most patients do not even feel the hair-thin needles as they are inserted or tapped in. Once the needles are inserted, the patient must be comfortable enough to fall asleep, in fact, most people say they feel very relaxed or sleepy, and some report increased energy levels afterwards.
Electro acupuncture (EA)
A tiny focused electric current is applied to the skin at the acupoints or can be applied to the needle itself. There are various modalities to consider.
Frequency of stimulation
Specific endogenous opiate responses have been reported:
- low-frequency stimulation (1–2 Hz) causes the release of endorphins and enkephalins (Aδ mediated). Less than 1 Hz is ineffectual;
- mid-range (12–15 Hz) stimulation results in the production of all three opioid classes;
- high-frequency (100 Hz) results in dynorphin release and has no effect on endorphins or enkephalins (Aβ-mediated). There is no further gain in opioid peptide release beyond 200 Hz.
Amplitude of stimulation
One to three milliampere is the range used most commonly in clinical practice. This intensity produces a non-painful fasciculation of the muscle in which the needle is embedded. Higher amplitudes cause pain and give rise to a stress response. Stress-induced analgesia depends in part on diffuse noxious inhibitory control and does not usually form a part of acupuncture analgesia.
Duration of stimulation
At least 10 min is required for the production of the endorphins, with maximal release after 20 min. When stimulation is prolonged beyond 1 h, or if the stimulation is repeated (e.g. 30 min bursts repeated after a 1 h interval), the analgesic effect is attenuated.
A stimulating heat may be applied onto the needle over the acupoints. Traditionally, this was a smouldering herb.
Here, pressure is used to stimulate the acupoints. This can be in the form of a bracelet or strap. This method is commonly used to alleviate motion sickness.
Mechanisms of action
How can unmedicated needles, inserted at sites so distant from their desired application, work? Why does placing a needle on the lower leg, for example, affect gastric function? Many maintain that this is a placebo effect, as these meridians and their Qi cannot be measured, dissected, or observed using standard anatomical or physiological techniques. The acupoints are located at sites that have a high density of neurovascular structures and are generally between or at the edges of muscle groups.
A study demonstrating the map of a meridian pathway, involved the injection of technetium 99 into both true and sham (minimal-depth needle insertion at sites away from traditional acupuncture points) acupoints. The scans demonstrated random diffusion of the tracer around sham points, but rapid progression of the tracer along the meridian at a rate that was inconsistent with either lymphatic/vascular flow or nerve conduction at the true acupoint.1Another demonstrated that needling a point on the lower leg traditionally associated with the eye, activated the occipital cortex of the brain, as detected by the detected by functional magnetic resonance imaging.
There are several postulated mechanisms of action.
Natural opioid substances
Needling affects the cerebrospinal fluid (CSF) concentrations of the naturally occurring opiate substances: dynorphin (acting at spinal level), endorphin (acting within the brain), and encephalin (acting both in the brain and at a spinal level). Endorphins and enkephalins are potent blockers or modulators of pain arising from the musculoskeletal system. Dynorphin is a powerful modulator of visceral pain; it has a weaker effect on musculoskeletal pain modulation.
The above notions were supported by cross-perfusion experiments in which an acupuncture-induced analgesic effect was transferred from the donor rabbit to the recipient rabbit when the CSF was transferred. The prevention of acupuncture-induced analgesia by naloxone and by antiserum against endorphins offers further support the involvement of endorphins.
The neurogate theory
Similar to the mechanism of the action of widely used trans-cutaneous electrical nerve stimulation (TENS), the neurogate theory has also been offered as an explanation to the blockade of pain. The close correlation between local acupuncture points for pain and trigger points as noted by Melzack, co-author of the gate theory of pain, represents a major convergence of Western and Eastern knowledge.
Endogenous corticosteroid release
The presence of a foreign body (needle) may act to stimulate vascular and immuno-modulatory factors, including those of local inflammation. Adrenocorticotrophic hormone has been shown to be elevated after acupuncture treatments, suggesting that adrenal activation and the release of endogenous corticosteroids may also result.
Acupuncture may induce relaxation of ‘stuck’ myofibrils within tissue planes. This is thought to have a similar effect to the injection of painful trigger points (a common procedure undertaken in pain clinics).
Local blood flow
In causing minor trauma to an area of the body, it is postulated that acupuncture may increase local blood flow to the surrounding area. This may initiate or catalyze the healing process.
Mesolimbic loop of analgesia
The mesolimbic pathway is one of the neural pathways the brain that link the ventral tegmentum area in the midbrain to the nucleus accumbens in the limbic system. It is one of the four major pathways where the neurotransmitter dopamine is found and produces a pleasurable feeling when stimulated.
It is postulated that, in chronic-pain patients, the mesolimbic loop is in a state of imbalance. After a relatively brief (30 min) period of stimulation with TENS or EA, a self-sustaining reverberation is set up, causing a re-setting of the pain-modulation pathways. This theory may well account for the long-term analgesic effects seen frequently in clinical practice.
The NIH Consensus Conference on acupuncture in 1997 concluded: “There is sufficient evidence of acupuncture’s value to expand its use into conventional medicine and encourage further studies of its physiology and clinical value.”
If you are experiencing chronic pain, you may want to consider adding acupuncture to your pain management treatment program.
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