Laney’s blood pressure is 147/84. 17 L of blood exits his right ventricle each m

Question

Laney’s blood pressure is 147/84. 17 L of blood exits his right ventricle each minute. His mitral valve closes 189 times each minute. His PR interval is 148 msec; RT is 243 msec. Pulse pressure is 63 mm Hg.

A.        How much blood enters Laney’s aorta with each heartbeat? Include units. (1)

B.        Identify all of the following that are reasonable conclusions based on this data: (2)

A) Laney is a normal man, at rest.

B) Laney is a normal man, exercising with some vigor.

C) Laney is at rest, but has a heart condition that reduces the strength of his heart.

D) Laney is a normal three-year old.

Explanation / Answer

A) The amount of blood exiting right ventricle per minute is 17 liters. Mitral valve closes 189 times each minute. So, heart rate is 189 per minute.

So, the amount of blood entering aorta per minute is,

= 17000/189

= 89.95 ml

B) Laney's stroke volume is normal. So, he does not have heart disease. He is not at rest because cardiac output is high. The blood pressure of a normal three year old is 110/80 mm Hg. Therefore, the possible logical conclusion is that Laney is a normal man exercising with some vigor (option B).

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