Acupuncture has been used to treat patients with carpal
tunnel syndrome (CTS) for improving symptoms such pain, numbness, preventing
local muscle atrophy and regaining the function. Advantages of acupuncture over
other treatments such as nonsteroidal anti-inflammatory drugs, local
corticosteroid injection and surgical procedures have been gradually
recognized. Here is the summary of recent reports of acupuncture treatments for
CTS.
Recently Maeda et al., (2017) conducted a blinded;
placebo controlled and randomized clinical study to assess changes in symptoms,
neurophysiologic and brain neuronal activities between verum acupuncture and
sham acupuncture treatments.
It was found that while both verum and sham acupuncture
reduced CTS symptoms, verum was superior to sham in producing improvements in
both peripheral and brain neurophysiological outcomes, i.e. median sensory
nerve conduction latency and digits 2 and 3 cortical separation distance in the
brain primary somatosensory cortex. Further, improvement in functional primary
somatosensory cortical plasticity soon following acupuncture predicated the
long-term symptom relief. Diffusion tensor imaging analysis of white matter
microstructure found that acupuncture at local versus distal acupuncture sites
may improve median nerve function at the wrist by mediating somatosensory
neuroplasticity following therapy.
In another study, Ural and Öztürk explored the effect of
acupuncture on cross-sectional area (CSA) of median nerve at the wrist in patients
with CTS in a randomized clinical study. Visual analog scale (VAS), Duruoz Hand
Index (DHI), Quick Disabilities of the Arm, Shoulder and Hand (DASH)
questionnaire scores, electrophysiologic measurements, and median nerve CSAs
were measured before and after the treatment in both acupuncture and splinting
only groups. Although VAS, DHI, Quick Disabilities of the Arm, DASH
questionnaire scores, electrophysiologic measurements were improved in both
groups, only acupuncture reduced CSAs, indicating anti-inflammatory effect by
acupuncture.
Results from the studies indicate that acupuncture may
improve CTS pathophysiology by both local and brain-based mechanisms involving
somatosensory cortical neuroplasticity.
References:
Maeda Y et al., Rewiring
the primary somatosensory cortex in carpal tunnel syndrome with acupuncture. Brain.
2017 Apr 1;140(4):914-927. doi: 10.1093/brain/awx015. https://www.ncbi.nlm.nih.gov/pubmed/28334999Ural FG & Öztürk GT, The Acupuncture Effect on Median Nerve Morphology in Patients with Carpal Tunnel Syndrome: An Ultrasonographic Study. Evidence-Based Complementary and Alternative Medicine, Volume 2017 (2017), Article ID 7420648, 5 pages. https://www.hindawi.com/journals/ecam/2017/7420648/