5Brat A, Franchi F, Padeletti L, et al. An unusual PR interval alternans during 2 : 1 atrio-ventricular block. Pacing Cliu Electrophysiol, 1983,6 : 161-165.
6Yamada T, Tabereaux PB, McElderry HT, et al. QRS ahernans with 2 : 1 atriovenreicular conduction block : what is the mechanism ? Ann Noninvasive Electrocaidiol, 2008,13 : 314-316.
7Morady F, Dicarlo LA Jr, de Buitlelr M, et al. Observations on QRS alternans in a patient with two types of nanow QRS tachyeardia. Am Heart J,1986,112:615-618.
9Subramanian A, Selvaraj RJ, Nair K, et al. Wide complex tachycardia with RR and QRS alternans:what is the mechanism? Pacing Clin Electrophysio1,2009,32 : 1329-1332.
10Csapo G. Parcxysmal nonreentrat tachycardias due to simultaneous conduction in dual atrioventriculr nodal pathways. Am J Cardiol, 1979,43 (8) : 1033.
