Overview of cardiac arrhythmias (Cardiac arrhythmias) practice

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Any stageFoundations71Mechanisms of disease35Clinical rotations832Pre-internship488

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Acute Carecommon
A 74-year-old man on a surgical ward reports palpitations on the second day after a right hemicolectomy. He is alert and comfortable, with a blood pressure of 128/76 mmHg and no chest pain. The pulse is 148/min and regular. The electrocardiogram shows narrow QRS complexes at a constant rate of 150/min with no discernible P waves in lead I, and between the QRS complexes in leads II, III and aVF the baseline carries regular deflections of uniform shape at about 300/min. Which one of the following does this tracing show?