MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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P waves present and normal
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P wave followed by a QRS
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The PR interval is constantly less than 0.12 s
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The PR interval measures between 0.12 and 0.20 s
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Detailed explanation-1: -This represents the time that it takes for the electrical impulse generated in the sinus node to travel through the atria and across the atrioventricular node to the ventricles. The normal PR interval is 0.12 to 0.20 seconds, or 120 to 200 milliseconds.
Detailed explanation-2: -The P-R Interval The first measurement is known as the “P-R interval” and is measured from the beginning of the upslope of the P wave to the beginning of the QRS wave. This measurement should be 0.12-0.20 seconds, or 3-5 small squares in duration.
Detailed explanation-3: -First-degree atrioventricular (AV) block is a condition of abnormally slow conduction through the AV node. It is defined by ECG changes that include a PR interval of greater than 0.20 without disruption of atrial to ventricular conduction. This condition is generally asymptomatic and discovered only on routine ECG.