Neurophysiology & Mechanisms of Acupuncture Action Flashcards

When treating a dog with chronic osteoarthritis using acupuncture, which neurophysiological mechanism is MOST important for achieving long-term pain relief beyond the treatment session?

Answer: Neuroplasticity and long-term modulation of central pain processing circuits

Long-term pain relief in chronic conditions requires neuroplastic changes in central pain processing, as repeated acupuncture treatments progressively reset sensitized spinal and supraspinal pain circuits.

Electroacupuncture (EA) at low frequency (2-4 Hz) versus high frequency (80-100 Hz) differs in its opioid peptide release profile. Which statement is correct?

Answer: Low frequency preferentially releases beta-endorphin and enkephalins; high frequency preferentially releases dynorphins

Low-frequency EA (2-4 Hz) preferentially stimulates supraspinal release of beta-endorphin and spinal enkephalins, while high-frequency EA (80-100 Hz) drives spinal dynorphin release.

For a horse presenting with cervical pain, segmental acupuncture principles would direct treatment to which spinal levels?

Answer: Cervical segments C1-C8 and upper thoracic segments T1-T2

Segmental acupuncture for cervical pain targets the cervical spinal cord segments (C1-C8) and adjacent upper thoracic levels (T1-T2) that innervate the cervical musculature, joints, and associated structures.

'Wind-up' in the context of veterinary acupuncture treatment planning refers to:

Answer: The progressive amplification of dorsal horn neuron responses to repeated C-fiber stimulation

Wind-up is the progressive increase in dorsal horn neuron excitability with repetitive C-fiber stimulation, driving central sensitization and chronic pain amplification that acupuncture treatment aims to reverse.

Acupuncture's neurophysiological effect on myofascial trigger points is primarily explained by:

Answer: Normalization of dysfunctional motor endplate activity and dispersal of sensitizing neuropeptides at the trigger point locus

Trigger point needling normalizes abnormal acetylcholine release at dysfunctional motor endplates and promotes dispersal of sensitizing neuropeptides (Substance P, CGRP), resolving the local twitch response and pain cycle.

An 'analgesic ceiling effect' sometimes encountered when treating severe chronic pain with acupuncture may be explained by which neurophysiological phenomenon?

Answer: Downregulation of opioid receptors due to prolonged exposure to high levels of endogenous opioid peptides

When acupuncture maximally stimulates endogenous opioid release, sustained receptor activation can trigger opioid receptor downregulation, reducing subsequent analgesic responsiveness and creating a ceiling effect.

In small animal patients receiving acupuncture for intervertebral disc disease (IVDD), the most clinically significant neurophysiological benefit is:

Answer: Reduction of spinal cord inflammation, promotion of neuroplasticity, and restoration of inhibitory interneuron function

In IVDD, acupuncture's primary neurophysiological contributions are reducing local spinal cord inflammation, promoting neuroplastic recovery, and restoring spinal inhibitory interneuron function to normalize sensorimotor signaling.