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Patient
68-year-old man, hypertensive, treated by beta-blocker, dyspnea;
Trace
Sinus rhythm with a rate of 62 bpm; fixed and very prolonged (480 ms) PR-interval: first-degree AV block;
Exergue
A first-degree atrioventricular block corresponds to a simple prolongation of the PR-interval which exceeds physiological values; there are an equal number of P-waves and QRS-complexes as well as a fixed, constant PR-interval exceeding 200 ms in adults; a first-degree atrioventricular block most often reflects a conduction delay located at the atrioventricular node; the longer the PR-interval, the greater the probability of an intra-nodal slowdown.
The term first degree atrioventricular (AV) block corresponds to a prolongation of the PR-interval beyond physiological values (180 ms in children, 200 ms in adults).