Tachycardia- and bradycardia-dependent bundle-branch block after acute myocardial ischaemia.
نویسنده
چکیده
Critical observation of the onset and course of transient bundle-branch block after acute myocardial ischaemia in 5 patients showed that the block was initially demonstrated both on increasing heart rate (tachycardia-dependent block) and on slowing (bradycardia-dependent block), with normal intraventricular conduction at intermediate heart rates. In some patients normal conduction disappeared within 2 to 12 hours with bundle-branch block present at all heart rates, to reappear again within 24 hours with block occurring at both higher and lower rates. Three patients werefollowedfor 3 to 7 months and showed that the critical rates for both tachycardiaand bradycardia-dependent block altered in such a way that the range of heart rates associated with normal conduction gradually increased until the block could no longer be elicited at the heart rates studied. It is suggested that tachycardiaand bradycardia-dependent bundle-branch block after acute myocardial ischaemia can be explained by characteristic changes in the electrophysiological properties of two
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ورودعنوان ژورنال:
- British heart journal
دوره 36 3 شماره
صفحات -
تاریخ انتشار 1974