Systemic blood pressure is expressed as the ratio of the systolic pressure (when

Question

Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries) to the diastolic pressure (when the heart is relaxed):systemicbloodpressure=systolicpressurediastolicpressure Both pressures are measured at the level of the heart and are expressed in millimeters of mercury (or torr), although the units are not written. Normal systemic blood pressure is 12080.

As pointed out in the text, blood pressure is normally measured on the upper arm at the same height as the heart. Due to therapy for an injury, a patient's upper arm is extended 31.0cm above his heart. In that position, what should be his systemic blood pressure reading, if he has normal blood pressure? The density of blood is 1060kg/m3 .

Give your answer as a pair of values for systolic and diastolic pressure, separated with a comma.

Explanation / Answer

Here ,

as change in Pressure = -density * g*h

change in Pressure = -1060*9.8 * 0.31

change in Pressure = -3220.3 Pa

Now 1 Pa = 0.0075 torr

change in Pressure = -24.15 torr

hence, for normal blood pressure ,

reading = 12080 - 24.15 torr

reading = 12055.85 torr

for normal blood pressure , the systemic blood pressure reading is 12055.85 torr

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