ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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QT interval
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PR segment
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PR interval
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ST segment
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Detailed explanation-1: -The PR interval represents the time between atrial depolarization and ventricular depolarization. Abnormalities in the timing of the PR segment can indicate pathology. A PR interval of under 120 milliseconds (ms) may indicate that electrical impulses are traveling between the atria and ventricles too quickly.
Detailed explanation-2: -The PR interval is the time from the onset of the P wave to the start of the QRS complex. It reflects conduction through the AV node. The normal PR interval is between 120 – 200 ms (0.12-0.20s) in duration (three to five small squares).
Detailed explanation-3: -The PR interval reflects whether impulse conduction from the atria to the ventricles is normal. The PR interval must not be shorter than 120 msec or longer than 220 msec. The PR segment is the flat line between the end of the P-wave and the start of the QRS complex.