Question

Why sphygmomanometer is kept at the level of heart?

Answer 1

If it is below your heart then the reading could be falsely high; if it is too high, falsely low. This is due to the hydrostatic component of the blood pressure, which is due to gravity and varies only with the height of the point being measured (in a standing position lowest at the head, highest at the feet). When measuring blood pressure it is desirable to have the same hydrostatic component as at the heart. Therefore, by convention, the "right" blood pressure is the one taken at the heart level. Please note that a 10 cm difference in level between the point of measure and the heart would introduce an error of 7.6 mmHg.

Answer 2

If it is below your heart then the reading could be falsely high; if it is too high, falsely low. This is due to the hydrostatic component of the blood pressure, which is due to gravity and varies only with the height of the point being measured (in a standing position lowest at the head, highest at the feet). When measuring blood pressure it is desirable to have the same hydrostatic component as at the heart. Therefore, by convention, the "right" blood pressure is the one taken at the heart level. Please note that a 10 cm difference in level between the point of measure and the heart would introduce an error of 7.6 mmHg....

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