[Effect of electro-acupuncture at neiguan P6 on sino-atrial conduction in patients without sick sinus syndrome].

The effects of electro-acupuncture (EA) at Neiguan P6 served as a main point and Jianshi P5 as an adjunct point on sino-atrial conduction were studied in 10 patients with normal sinus nodal function. The results were as follows: During EA and in period of intrinsic heart rate (IHR0) the sinoatrial conduction times (SACT) from sinus node electrogram were significantly shortened than that in control, (P < 0.01 and P < 0.001, respectively). But the SACT could not be further shortened by stimulating the acupoints during IHR0 (P < 0.05). It is suggested that EA at Neiguan P6 as a main point could improve sino-atrial conductivity in most patients with normal sinus node function, which seems to be mediated by autonomic nerve system. The normal value of SACT after autonomic nerve blockade needs to be established.