Microlife BP AG1-40 Instruction Manual download pdf (Page 11)

4.5. Measuring procedure

4.5.1. Put the chestpiece under the cuff

The chestpiece shall not be placed ON or INTO the cuff, it shall be

placed either under the cuff, or 1 - 2 cm below it. The chestpiece

is then placed correctly , when the Korrotkoff’s sound appears

strongest («loudest»). Make sure the chestpiece is in contact with

skin and above the brachial artery. Wear the binaural (earpieces)

properly to check the Korotkoff’s sound during measurement.

Before using the stethoscope, be sure there is no crack on the

diaphragm, earpieces, and tubing. Any improper setup or damage of the stethoscope will cause

distorted sound or poor sound transmission to make inaccurate reading.

4.5.2. Inflating the cuff

Close the air valve by turning the screw clockwise. Do not over-

tighten. Squeeze the inflation bulb with the hand at a steady rate

until the pointer on the gauge is 30 mmHg above your normal systolic

pressure value. If you are not sure the value, inflate to 200 mmHg first.

4.5.3. Systolic blood pressure reading

Slightly and repeatedly push button of the valve and hold stetho-

scope chestpiece over brachial artery. Proper deflation rate is

essential for an accurate reading, so you should practice and

master a recommended deflation rate of 2 - 3 mmHg per second or

a drop of one to two marks on the pressure gauge each heartbeat.

You should not keep the cuff inflated any longer than necessary.

As the cuff begins to deflate, you must listen carefully with the stethoscope. Note the reading on

the gauge as soon as you hear a faint, rhythmic tapping or thumping sounds. This is the systolic

blood pressure reading. Listen carefully and familiarize yourself with pulse (Korotkoff’s) sound.

4.5.4. Diastolic blood pressure reading

Allow the pressure to continue dropping at the same deflation rate. When your diastolic blood

pressure value reached, the thumping sound stops. Deflate the cuff valve completely. Remove

the cuff from arm and stethoscope from ears.

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Microlife BP AG1-40 Instruction Manual Page 11