HPI
A 71-year-old man presents with shortness of breath, and his ECG is initially read as a junctional rhythm. On later review, it is even mistaken for atrial fibrillation. But the rhythm is actually regular, and closer inspection reveals subtle atrial activity. The diagnosis depends on recognizing what is and is not a true P wave, and on not mistaking buried atrial activity for part of the T wave.
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