Blood pressure is measured at the brachial artery in the

Blood pressure is measured at the brachial artery in the upper arm (Fig. P10.89). An inflatable strap is pumped with air until the artery is collapsed, stopping all flow. The pressure in the cuff is then slowly reduced while the operator listens with a stethoscope for a pulse downstream of the cuff. The pressure at which the pulse resumes is the systolic (maximum) pressure. The brachial artery has a radius of 0.50 cm, and the cuff is usually applied at a point 0.30 m away from the aorta at the heart. If the flow rate though the brachial artery is 1.5 × 10–5 m3/s, what is the pressure drop between the point of measurement and the aorta? Is a measurement from the brachial artery in the arm a good representation of the pressure in the aorta at the heart? (Assume the heart and arm are at the same height.)


Figure P10.89

 Sphygmomanometer Cuff - Artery Stethoscope

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