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Exercise Induced Atrioventricular Block with Gap Phenomenon in Atrioventricular Conduction |
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| Authors: | TETSURO TOEDA SHYUJI SUETAKE KEIICHI TSUCHIDA KAZUYOSHI TAKAHASHI TSUTOMU MIIDA HIROTAKA ODA NORIO HIGUMA |
| Affiliation: | Department of Cardiology, Niigata City General Hospital, Niigata, Japan |
| Abstract: | A 54-year-old man with normal atrioventricuiar (AV) conduction at rest gave a 4-year history of presyncope during exercise. Treadmill testing showed exercise induced AV block. Electrophysiological study demonstrated rate dependent infranodal AV block and abnormal refractory period of the His-Purkinje system. The gap phenomenon in AV conduction occurred during the programmed stimulation. Supernormal conduction could be considered as the mechanism of the gap phenomenon in this patient. |
| Keywords: | exercise induced atrioventricuiar block infranodal block gap phenomenon electrophysiological study |