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All ECG 55

This tracing shows sinus rhythm at about 90 beats per minute. The PR interval is 0.24 sec, consistent with first-degree atrioventricular block. The P wave is also prolonged to greater than 0.12 sec. This is one of the criteria for “left atrial abnormality.” Recent studies have attributed P-wave prolongation to conduction delay between the atria (Bachman’s bundle).

Related Topic Reviews: First Degree AV Block, Left Atrial Enlargement