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Patient
Young woman 23 years of age, asymptomatic, with no prior history and a normal cardiac ultrasound;
Trace
Sinus rhythm with a rate of 56 bpm; fixed PR-interval of normal duration (130 ms); isoelectric PR segment;
Exergue
The PR-interval is considered normal between 120 and 200 ms; a PR segment elevation is significant if greater than 0.5 mm, and a depression if greater than 0.8 mm.
A step by step systematic analysis of an electrocardiogram includes measuring the duration and the polarity of the PR-interval. The PR-interval (or PQ-interval) corresponds to the time frame between the depolarization of the first atrial cell and the depolarization of the first ventricular cell.