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  • Title: Tachycardia-dependent second degree AV-block in a patient with right bundle branch block.
    Author: Kalusche D, Roskamm H.
    Journal: J Electrocardiol; 1987 Apr; 20(2):169-75. PubMed ID: 3598458.
    Abstract:
    A 55-year old male patient, with dizzy spells during everyday activity and a complete right bundle branch block as the sole electrocardiographic abnormality, reproducibly demonstrated tachycardia-dependent Mobitz Type II- and 2:1 second degree atrioventricular block. An electrophysiologic study revealed a provocable block within the distal portion of the bundle of His without evidence of a split His potential. Because of the truly tachycardia-dependent AV-block, beta-blocker medication was initiated to prevent high sinus rates during everyday activity. This therapy abolished symptoms totally.
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