MSD Manual

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ECG, atrial flutter, dog
ECG, atrial flutter, dog

    This ECG shows atrial flutter in a dog. The atrial rate is steady at 440 bpm. Every 4th to 7th atrial depolarization (P wave) gets through the AV node to generate ventricular depolarization (QRS complex).

Courtesy of Dr. Mark D. Kittleson.