Several possible causes of heart block exist. It may stem from aging of the conduction system, a prior heart attack, heart ...

Upon review of this body and the described ECG findings, certain common patterns ... widened QRS complexes were most commonly attributed to RBBB or an unspecific intraventricular conduction ...

Classification of QRS morphology on ECG followed pre-defined criteria (22). The LBBB was defined as follows: QRS duration ≥120 ms, QS or rS in V1, and monophasic R wave without Q waves in I and V6.

Eleven studies describing sinoatrial (SA) nodal, atrioventricular (AV) nodal or infra-Hisian conduction parameters in the setting of cocaine use were found. Fourteen studies and two case series ...

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