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Uptodate Reference Title
Normal sinus rhythm with Mobitz I second-degree AV block
Normal sinus rhythm with Mobitz I second-degree AV block
Normal sinus rhythm with Mobitz I second-degree AV block. Lead V1 and lead II rhythm strips show a regularly irregular rhythm with group beat. There are distinct P waves before each QRS as well as during the relative pauses. The P-P interval is constant, consistent with a sinus rhythm at a rate of 80 bpm. There is progressive prolongation of the PR interval followed by a dropped beat (nonconducted sinus P wave), reflective of Mobitz I second-degree AV block.