MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PR interval represents the physiological delay suffered by the stimulus through the atrioventricular node (AV). It is measured from the beginning of the P wave until the beginning of the Q or R wave. What is the normal range of PR interval?
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a. 0.04 0.08 s
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b. 0.09 0.12 s
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c. 0.12 0.2s
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0.44 0.48s
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Explanation:
Detailed explanation-1: -A prolonged PR interval indicates delayed conduction of the sinoatrial, or SA, nodal impulse to the ventricles and is called first-degree AV block.
Detailed explanation-2: -PR Interval It represents the time from the beginning of atrial depolarization to the start of ventricular depolarization and includes the delay at the AV node. The average interval is 3 to 5 small squares (120 to 200 ms). [35] Variations in the PR interval can lead to various disorders.
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