What is implied by an abnormally prolonged PR interval?

a. Atrioventricular block
b. Bundle-branch block
c. Myocardial infarction
d. Valvular detachment


ANS: A
PR intervals longer than 0.20 sec suggest that the impulse is abnormally delayed at the AV node and a "block" is present.

Health Professions

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Health Professions