Archives of internal medicine . 330 THE ARCHIVES OF INTERXAL MEDICINE ular contractions by respectively , , second are ])rece(ledl)y intermissions slightly shorter than the average. May it not be thatin these instances the normal impnlses reaching the ventricle at a timewhen it was nearly ready to contract from its inherent rhythmicity, haveslightly hastened the contraction? Another tracing (Tracing 13) taken on the same day does not appar-ently show a complete block. There is a bigeminal ventricular rhytbmThe c elevation coiresponding to the first of each pair of ventricularbeat
Archives of internal medicine . 330 THE ARCHIVES OF INTERXAL MEDICINE ular contractions by respectively , , second are ])rece(ledl)y intermissions slightly shorter than the average. May it not be thatin these instances the normal impnlses reaching the ventricle at a timewhen it was nearly ready to contract from its inherent rhythmicity, haveslightly hastened the contraction? Another tracing (Tracing 13) taken on the same day does not appar-ently show a complete block. There is a bigeminal ventricular rhytbmThe c elevation coiresponding to the first of each pair of ventricularbeats follows an a wave after a fairly constant period, varying from , a conduction time similar to that observed in this case at otherperiods during a normal auriculoventricular rhythm. The second of eachpair of contractions is, however, associated with a combined a 4- c waveon the jugular pulse. By comparing the a wave with the brachial tracing,however, it is found that the a-brachial period suggests usually a normal,o
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