Needling of the Extra 1 Point Decreases BIS Values and Preoperative Anxiety

Abstract

Acupuncture has anxiolytic effects. We investigated the effect of acupuncture on the Bispectral Index (BIS) values and anxiety. Fifty patients were randomly assigned to group A to receive acupuncture for 15 minutes on the extra 1 point (yintang) or to group C, where they received the same treatment on a control point located 2 cm lateral to the end of the right eyebrow. BIS values were recorded before acupuncture; during acupuncture every 30 seconds for 15 minutes and every 30 seconds for 90 seconds when the acupuncture treatment was accomplished. Anxiety level was assessed before and after acupuncture by a verbal score scale (VSS) (0 = no anxiety, 10 = worst anxiety). BIS values were significantly decreased during acupuncture when applied on the extra 1 point (p = 0.0001) but not on the control point. Acupuncture application significantly decreased the VSS values within the A group (p = 0.027) and in the C group (p = 0.0001), when compared to the baseline (pre-acupuncture) VSS values. However, no differences were found between the two groups regarding BIS or VSS values. In conclusion, needling the extra 1 point preoperatively significantly decreases the BIS values and the VSS for anxiety but needling of a control point decrease only VSS values.