Firstdegree atrioventricular block

First-degree atrioventricular block occurs when the PR interval is prolonged (0.20 s or longer, or 0.18 s or longer if the heart rate exceeds 90 beats/min). If the QRS interval is normal, the delay in conduction is in the atrioventricular node. With a prolonged QRS, the conduction delay may be in the His-Purkinje system. It is usually asymptomatic, and may be due to drugs (e.g. digoxin, b-blockers, calcium-channel blockers), intrinsic conduction system disease, and hypertension. It can be ominous if it is due to endocarditis with abscess formation involving the conduction system.

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