Mobitz II second-degree AV block can progress to third-degree AV block if left untreated.

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Mobitz II second-degree AV block is characterized by a consistent dropped beat due to a conduction disturbance in the His-Purkinje system. The condition can progress to third-degree AV block, where there is complete AV dissociation, meaning that atrial and ventricular activity occurs independently of each other. If left untreated, Mobitz II second-degree AV block can lead to complete heart block, which may be fatal.

Mobitz II Second-Degree AV Block Can Progress to Third-Degree AV