In a strictly controlled clinical situation, (postoperative sickness) where variables were reduced to a minimum, it was possible to demonstrate an effective prophylactic
antiemetic action of P6 (Neiguan) acupuncture. Manual and electrical invasive (
needling) stimulation of this point were equally effective. Non-invasive stimulation (transcutaneous electrical or pressure) was effective in the early postoperative period, but the effect did not last as long as for invasive acupuncture--although it was as good as standard
antiemetics. Stimulation of a "dummy"
acupuncture point was ineffective as was administration of the acupuncture after the
emetic stimulus (
opioid). This effect can be blocked by local anaesthesia at the P6 point.
Acupressure (P6) is moderately effective in reducing
morning sickness, but here there is more of a psychological
element as pressure on a "dummy" point gives some alleviation of symptoms. Given in conjunction with standard
antiemetics, P6 acupuncture is a useful adjuvant in reducing sickness after
cancer chemotherapy. This effect can be prolonged for 24 hours by
acupressure.