Anderson G J, Greenspan M, Kimbiris D
J Electrocardiol. 1981;14(1):91-6. doi: 10.1016/s0022-0736(81)80035-0.
This case report describes the electrocardiographic features of concealed junctional premature beats. When the junctional premature beats occurred in a bigeminal fashion, pseudo 2:1 AV block occurred. The presence of 2:1 AV block was related to the prematurity (H1-H2) of the junctional extrasystoles, in which coupling intervals less than 425 msec were concealed and those greater than 425 msec were manifest. This report is unusual in that persistent long runs of pseudo 2:1 AV conduction were established. In addition, the extrasystolic beats demonstrated exit block and the interectopic sinus beats (n) followed the formula 2n-1.
本病例报告描述了隐匿性交界性早搏的心电图特征。当交界性早搏呈二联律出现时，可发生假性2:1房室传导阻滞。2:1房室传导阻滞的存在与交界性期前收缩的提前程度（H1-H2）有关，其中联律间期小于425毫秒的为隐匿性，大于425毫秒的为显性。本报告的不同寻常之处在于确立了持续长时间的假性2:1房室传导。此外，期前收缩表现为传出阻滞，异位性窦性搏动（n）遵循2n-1公式。
