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Blood pressure is usually measured by wrapping a closed air-filled jacket equipped with a pressure gage around the upper arm of a person at the level of the heart. Using a mercury manometer and a stethoscope, the systolic pressure (the maximum pressure when the heart is pumping) and the diastolic pressure (the minimum pressure when the heart is resting) are measured in mmHg. The systolic and diastolic pressures of a healthy person are about 120 mmHg and 80 mmHg, respectively, and are indicated as 120/80. Express both of these gage pressures in kPa, psi, and meter water column.

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Answer:

For kPa (kilopascal):

The systolic blood pressure is 16 kPa and diastolic is 11 kPa.

For psi (pound-force per square inch):

The systolic blood pressure is 1.5 psi and diastolic is 2.3 psi.

For meter water column:

The systolic blood pressure is 2 mH2O and diastolic is 1 mH2O.

 

Blood pressure is actually measured in millimeters of mercury (mmHg) but it can be expressed in other units as well. The reading is always expressed in upper (systolic) and lower (diastolic) value.

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