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Chapter 10: Q21Q (page 260)

When blood pressure is measured, why must the arm cuff be held at the level of the heart?

Short Answer

Expert verified

The arm cuff must be held at the level of the heart to get an accurate reading.

Step by step solution

01

Understanding the hydrostatic pressure

Whenever a specific liquid fills in a container, and if the measurement of liquid pressure starts from the free liquid's surface and goes down into the container, then the value of pressure would be increasing.

If the measurement of pressure starts at a specific datum point and goes upward into the container, the pressure would decrease.

02

Determining the reason behind holding the arm cuff at the level of the heart.

Generally, blood pressure measures the pressure of the blood coming out of the heart. Whenever the position of the cuff is below the heart level, then the blood pressure will not be the actual one; it shows the addition of the pressure from the pumping of the heart and the pressure due to the height of blood above the cuff. Due to this reading will be high. Likewise, if the cuff is positioned above heart level, the pressure will be too high because the measured pressure will be the sum of the pressure from the heart pumping and the pressure due to the blood's height above the cuff. Due to this, the reading will be too low.

So, the arm cuff must be held at the level of the heart to get the accurate reading.

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Most popular questions from this chapter

Four lawn sprinkler heads are fed by a 1.9-cm-diameter pipe. The water comes out of the heads at an angle of 35掳 above the horizontal and covers a radius of 6.0 m. (a) What is the velocity of the water coming out of each sprinkler head? (Assume zero air resistance.) (b) If the output diameter of each head is 3.0 mm, how many liters of water do the four heads deliver per second? (c) How fast is the water flowing inside the 1.9-cm-diameter pipe?

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