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Mobitz type I 2nd-degree atrioventricular block.

Mobitz type I 2nd-degree atrioventricular block.
Mobitz type I 2nd-degree atrioventricular block.

The PR interval progressively lengthens with each beat until the atrial impulse is not conducted and the QRS complex is dropped (Wenckebach phenomenon); AV nodal conduction resumes with the next beat, and the sequence is repeated.