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Case Record of the MGH: A 32-year-old woman presented with fatigue, myalgias, and palpitations. The cardiac rhythm was irregularly irregular, and an electrocardiogram showed findings suggestive of grouped beating. A diagnosis was made. Full case details: nej.md/4lVks2d #MedSky #CardioSky

Top: An ECG obtained on hospital day 1 showing sinus rhythm with first-degree atrioventricular block with a PR interval of 350 msec 

Bottom: An ECG obtained on hospital day 2 showing sinus rhythm with complete atrioventricular block and junctional escape rhythm

A 32-year-old woman presented with fatigue, myalgias, and palpitations. The cardiac rhythm was irregularly irregular, and an electrocardiogram showed findings suggestive of grouped beating. What is the most likely diagnosis in this case? 🗳️ Cast your vote before August 21: nej.md/45CFZrc #MedSky

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Top: An ECG obtained on hospital day 1 showing sinus rhythm with first-degree atrioventricular block with a PR interval of 350 msec.  

Bottom: An ECG obtained on hospital day 2 showing sinus rhythm with complete atrioventricular block and junctional escape rhythm.