PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the full cardiac cycle takes around 0.8 seconds, what would be the resulting heart rate (in beats per minute)?
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75
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48
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112
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80
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Explanation:
Detailed explanation-1: -A cardiac cycle is made up of atrial systole and diastole and ventricular systole and diastole. In humans, the heart beats for about 72 times per minute. Hence the time of a cardiac cycle is 60/72=0.860/72=0.8 sec approx.
Detailed explanation-2: -For regular heart rhythms, heart rate can easily be estimated using the large squares (0.2s) on an ECG. Simply identify two consecutive R waves and count the number of large squares between them. By dividing this number into 300 (remember, this number represents 1 minute) we are able to calculate a person’s heart rate.
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