A third-degree AV block associated with an anterior MI is usually preceded by:

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Third-degree AV block associated with an inferior MI is thought to be the result of a block above the bundle of His. It often occurs after progression from first-degree AV block or second-degree AV block type I. The resulting rhythm is usually stable because the escape pacemaker is usually junctional (narrow QRS complexes) with a ventricular rate of more than 40 beats/min.Third-degree AV block associated with an anterior MI is usually preceded by second-degree AV block type II or an intraventricular conduction delay (right or left bundle branch block). The resulting rhythm is usually unstable because the escape pacemaker is usually ventricular (wide QRS complexes) with a ventricular rate of less than 40 beats/min.

A Third-Degree AV Block Associated with an Anterior MI Is