Wellens H J, Wesdorp J C, Düren D R, Lie K I
Circulation. 1976 Apr;53(4):595-9. doi: 10.1161/01.cir.53.4.595.
Of 67 patients with reciprocal atrioventricular (A-V) nodal tachycardia consecutively studied by programmed electrical stimulation of the heart, nine patients showed second degree block toward the ventricle and one patient toward the atrium during tachycardia. In four patients the occurrence of block was critically related to the prematurity of the test stimulus initiating the tachycardia. In three patients block developed following increase in rate of tachycardia. In two patients block could be elicited by introducing premature ventricular stimuli during tachycardia. Our observations indicate that different mechanisms may be responsible for second degree block during reciprocal supraventricular tachycardia. The finding of second degree block during reciprocal supraventricular tachycardia excludes a tachycardia with A-V conduction over the A-V node - His pathway and V-A conduction over an accessory A-V pathway.
在通过心脏程控电刺激连续研究的67例房室折返性心动过速患者中，9例在心动过速时出现向心室的二度阻滞，1例出现向心房的二度阻滞。4例患者阻滞的发生与引发心动过速的试验刺激的提前程度密切相关。3例患者在心动过速心率增加后出现阻滞。2例患者在心动过速时引入室性早搏刺激可诱发阻滞。我们的观察表明，房室折返性室上性心动过速期间二度阻滞可能由不同机制引起。房室折返性室上性心动过速期间二度阻滞的发现排除了通过房室结-希氏束途径进行房室传导以及通过附加房室途径进行室房传导的心动过速。
