How is blood pressure measured?

Mercury column sphygmomanometer measurement method

1. The patient sits or lies down, exposing one arm, the cuff should not be too tight, straighten the elbow, palm up

2. Flatten the sphygmomanometer, drive out the air in the cuff, and wrap it around the middle of the upper arm flatly, and the tightness is suitable for being able to put in one finger. The lower edge of the cuff is 2-3 centimeters from the elbow socket.

3. Put on the stethoscope and press it against the brachial artery at the inner side of the elbow socket. With the other hand, close the screw cap on the valve, hold the balloon and pump into the cuff until the brachial artery beat disappears and then rises 20 to 30 mm Hg, and then slowly release the valve, so that the mercury column slowly declines, and pay attention to the scale of the mercury column refers to. When the first beat is heard in the stethoscope, the scale indicated by the mercury column is the systolic blood pressure. When the beat suddenly weakens or disappears, the scale indicated by the mercury column is the diastolic pressure.

4. After the measurement, exhaust the remaining air in the cuff, tighten the screw cap on the valve, untie the cuff, organize it properly, and put it into a box to prevent crushing the glass.

5. Fractional systolic/diastolic blood pressure in millimeters of mercury (mmHg) is used for recording, which has now been changed to KPA, with each KPA = 7.5 mmHg.

Note: When measuring blood pressure, the sphygmomanometer's "0" point should be at the same level as the brachial artery and heart. If the limb is too high, the measured blood pressure is often low, and vice versa. Secondly, for hemiplegic patients, the healthy arm should be taken. For those who need to observe the blood pressure, try to do the four fixed, namely, fixed time, fixed part, fixed position (posture), fixed sphygmomanometer. Here, but also often check the sphygmomanometer to ensure accuracy.

Genesis Medicine

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How to Measure Blood Pressure Accurately

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Measurement of Blood Pressure Methods and Precautions

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What should I pay attention to when measuring blood pressure?

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If you measure it yourself at home, it is recommended to use a traditional sphygmomanometer, which is more accurate than an electronic one. A sphygmomanometer plus a stethoscope is about 100 yuan. Operation: the cuff tied to the left or right upper arm (left and right arm blood pressure will have some differences, always on one side of the measurement can be), in the elbow on the transverse line 1 to 2 centimeters, loose and tight, turn on the sphygmomanometer switch, adjust the stethoscope ear plugs, the stethoscope head on the cuff under the part of the brachial artery, wear a stethoscope, tighten the valve of the sphygmomanometer air bag began to inflate, flat look at the mercury column, at the beginning you will hear "Thump" "thump" similar to the sound of the heartbeat, with the rise of the mercury column, the sound gradually decreases to disappear, then you can stop pumping (the general public may not be good at mastering this scale, there is an easy way to understand the measured person's usual blood pressure value, such as high pressure) 130, then pumping more than this 20, to 150 stop on the line). Slowly release the valve, be sure to slowly deflate, watch the mercury column and listen to the sound, when the beginning of the "thump" "thump" sound, at the same time, the mercury column has some jumps, this time corresponding to the value of high pressure, then the mercury column continues to fall, when the "thump" "thump" sound, when the "thump" "thump" sound, when the mercury column continues to fall, when The mercury column continues to fall, and when the "thumping" and "thumping" sounds become smaller, the corresponding value is the low pressure. After the measurement, squeeze out the air from the cuff, and tilt the sphygmomanometer 15 degrees to the right to turn off the switch. Blood pressure not exceeding 140/90mmHg is normal.