MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Detailed explanation-1: -Normal ECG values for waves and intervals are as follows: RR interval: 0.6-1.2 seconds. P wave: 80 milliseconds. PR interval: 120-200 milliseconds.
Detailed explanation-2: -Long R-R interval is a common electrocardiographic phenomenon among the elderly with nonvalvular atrial fibrillation. The long R-R interval mostly occurs in nonsleeping time. The average ventricular rate, slowest ventricular rate, and fastest ventricular rate of sleep time are higher than nonsleeping time.
Detailed explanation-3: -Look at your collected lab data, what happens to the heart rate as the R-R interval decreases? The heart rate increases.
Detailed explanation-4: -An increase in heart rate corresponds to a shortening of the cardiac cycle (RR interval decreases). Exercise increases heart rate when corresponds to a shortening of a cardiac cycle. Thus the RR interval decreases after exercise.