1Berbari EJ, Lazzara R,Samet P, et al.Noninvasive techniques for detection of electrical activity during the P-R segment. Circulation,1973,48:1005.
2Sherif N, Mehra R, Restivo M. Beat-to-beat high-resolution electrocardiogram: technical and clinical aspects. Prog Cardiovasc Dis, 1993,35:407.
3Flowers NC, Horan LG, Yang WQ. Application of beat to beat techniques. Pacing Clin Electrophysiol, 1990,13:2148.
4Kepski R, Plucinski Z, walczak F. Noninvasive recording of His-Purkinje system [HPS] activity in man on beat to beat basis.Pacing Clin Electrophysiol, 1982, 5:506.
5Ushiyama Y, Okajima H, Sasaki Y, at el. Noninvasive recording of His bundle activity with an analog delay device in normal subjects and patients with atrioventricular block. Heart Vessels,1995,10:241.
2Damate AN, Lau SH, Helfant R et al. Study of heart block in man using His bundle recordings. Circulation, 1969;39(3):297 - 305.
3Berbari EJ, Lazzara R, Samet P et al. Noninvasive technique for detection of electrical activity during the P-R segment Circulation, 1973;48(5): 1005 - 13.