CVA Neurophysiology & Mechanisms of Acupuncture Action 2 β Questions and Answers
Question 1: Acupuncture's net effect on the autonomic nervous system in chronic pain states typically results in:
- Exclusive stimulation of sympathetic fight-or-flight responses
- Complete blockade of both sympathetic and parasympathetic activity
- Increased parasympathetic tone and normalization of sympathetic hyperactivity (Correct answer)
- Stimulation of only the enteric nervous system with no central effects
Correct answer: Increased parasympathetic tone and normalization of sympathetic hyperactivity
Acupuncture generally restores autonomic balance by enhancing parasympathetic (rest-and-digest) tone and dampening chronic sympathetic hyperactivity associated with pain and stress states.
Question 2: How does acupuncture modulate Substance P in the context of chronic pain management?
- It permanently increases Substance P production to enhance tissue healing
- Substance P is unrelated to acupuncture's analgesic mechanisms
- It selectively destroys Substance P-producing neurons in the dorsal root ganglia
- It can reduce elevated Substance P levels, thereby decreasing neurogenic inflammation and central sensitization (Correct answer)
Correct answer: It can reduce elevated Substance P levels, thereby decreasing neurogenic inflammation and central sensitization
Acupuncture has been shown to reduce elevated Substance P concentrations in chronic pain states, attenuating its pro-inflammatory and pro-nociceptive effects in peripheral tissues and the spinal cord.
Question 3: Stimulation of acupuncture point ST-36 (Zusanli) in dogs activates which specific anti-inflammatory mechanism?
- Reduction in gastrointestinal motility to decrease intestinal inflammation
- Direct mast cell suppression at the needle insertion site only
- The cholinergic anti-inflammatory pathway via vagus nerve activation (Correct answer)
- Increased cortisol secretion from the adrenal cortex
Correct answer: The cholinergic anti-inflammatory pathway via vagus nerve activation
ST-36 stimulation activates the vagus nerve's cholinergic anti-inflammatory pathway, which inhibits macrophage release of pro-inflammatory cytokines (TNF-Ξ±, IL-1Ξ², IL-6) systemically.
Question 4: What role do mast cells play in the neurophysiology of acupuncture point stimulation?
- Mast cells are absent from acupuncture point locations and play no role
- Mast cells degranulate upon needle insertion, releasing histamine and heparin that activate local afferent nerve fibers (Correct answer)
- Mast cells exclusively suppress local inflammatory responses immediately upon needle contact
- Mast cells only respond to pharmacological injection, not mechanical needle stimulation
Correct answer: Mast cells degranulate upon needle insertion, releasing histamine and heparin that activate local afferent nerve fibers
Mast cells, concentrated at acupuncture point locations, degranulate in response to needle insertion, releasing bioactive mediators that activate local afferent C and A-delta fibers to initiate acupuncture signaling.
Question 5: Calcitonin Gene-Related Peptide (CGRP) is significant in veterinary acupuncture neurophysiology primarily because:
- It is the main endogenous opioid released during acupuncture treatment
- It is only relevant in equine acupuncture and not applicable to small animal patients
- It mediates local vasodilation and participates in neurogenic inflammation modulation at acupuncture sites (Correct answer)
- It permanently blocks all pain pathways when released during needling
Correct answer: It mediates local vasodilation and participates in neurogenic inflammation modulation at acupuncture sites
CGRP released from sensory nerve terminals at acupuncture sites promotes local vasodilation and modulates the neurogenic inflammatory response, influencing both local tissue effects and afferent signaling.
Question 6: Acupuncture's modulation of the hypothalamic-pituitary-adrenal (HPA) axis results in which clinically relevant effect?
- Normalization of stress hormone levels and reduction of chronic HPA axis hyperactivation (Correct answer)
- Permanent suppression of all cortisol production in treated animals
- Acute dangerous elevation of ACTH and cortisol immediately after treatment
- Complete blockade of CRH release from the hypothalamus
Correct answer: Normalization of stress hormone levels and reduction of chronic HPA axis hyperactivation
Acupuncture helps normalize HPA axis dysregulation by reducing excessive cortisol and ACTH secretion in chronically stressed or pain-sensitized animals, restoring homeostatic stress responses.
Question 7: Central sensitization, which veterinary acupuncture aims to reverse, is best defined as:
- Increased sensitivity of peripheral nociceptors at the site of injury only
- Heightened excitability of dorsal horn neurons resulting in amplified and expanded pain signaling (Correct answer)
- Sensitization of the cerebral cortex specifically to auditory stimuli
- Increased sensitivity of alpha motor neurons to voluntary movement commands
Correct answer: Heightened excitability of dorsal horn neurons resulting in amplified and expanded pain signaling
Central sensitization involves increased excitability of spinal cord dorsal horn neurons, manifesting as hyperalgesia, allodynia, and expanded receptive fields, which acupuncture can help reverse through neuroplastic mechanisms.
CVA Neurophysiology & Mechanisms of Acupuncture Action 2
Acupuncture's net effect on the autonomic nervous system in chronic pain states typically results in: