7Albertsen AE, Nielsen JC, Poulsen SH, et al. Biventricular pacing preserves left ventricular performance in patients with high - grade atrio - ventricular block : a randomized comparison with DDD (R) pacing in 50 consecutive pa- tients [ J ]. Europace ,2008,10 ( 3 ) : 314 - 320.
8Miki Y, Ishikawa T, Matsushita K, et al. Optimal program- ming of the atrioventricular delay using the phonocardio- gram[ J ]. Pacing Clin Electrophysiol, 2009,32 ( suppl 1) :81 -85.