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Question

A patient went to see a cardiologist complaining about being tachycardic. Upon examination, his heart rate was found to be 90 beats per minute; his end-diastolic volume was found to be 140 mL per minute whereas his end-systolic volume was 60 mL per minute. What was his calculated cardiac output per minute?

एक रोगी टेकीकार्डिएक की शिकायत लेकर हृदयरोगविशेषज्ञ के पास गया। जाँच करने पर उसकी हृदय दर 90 स्पंद प्रति मिनट पायी गई थी, उसका अंत्य अनुशिथिलन आयतन 140 मिली. प्रति मिनट जबकि उसका अंत्य प्रकुंचन आयतन 60 मिली. प्रति मिनट पाया गया था। उसका प्रति मिनट परिकलित हृदय निकास क्या था?

A
4.4 litres

4.4 लीटर
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B
5.8 litres

5.8 लीटर
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C
6.6 litres

6.6 लीटर
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D
7.2 litres

7.2 लीटर
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Solution

Cardiac output stroke volume x Heart rate

⇒ Heart rate = 90 beats per minute

⇒ Blood volume in ventricles at the end of diastole =140 ml

⇒ Blood volume in ventricles at the end of systole =60ml

Stroke volume=140-80mL

⇒ 480ml.

So, Cardiac output = stroke volume x Heart rate

⇒ Cardiac output = 80ml x 90 beats per minute

⇒ Cardiac output=7.2 Litres

So, the correct answer is 72 Litres.


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