A method of an incomplete ischemia of the lateral wall of the left ventricle pro-duced by pulling the ventricular branch of the left coronary artery of rabbits was employed in thisstudy and the dispersion of the effective refractoriness used as an index.It was noted that the effectiverefractory periods at the different sites in AMI region were mainly shortened and the dispersion of re-fractoriness increased obviously.Nevertheless

EA at Neiguan acupoint could inhibit reduction of theeffective refractory of ischemic myocardium and improve the disperion of refractoriness markedly

which would be beneficial to synchronization of the myocardial excitatory state.It suggests that EAhave some effect of anti—arrhythmia.