How to use mercury sphygmomanometer in four steps?

1, use mercury column, and rest quietly before measuring blood pressure 15 minutes or more. You can take a sitting or supine position to measure your right hand. The sphygmomanometer is roughly at the same level as the heart.

2. Stick the cuff of the sphygmomanometer on the right upper arm. Don't tie the cuff too tightly, it can accommodate two fingers. The lower edge of the cuff is about two centimeters above the elbow. Put the stethoscope where the cubital fossa artery pulsates, and quickly inflate the sphygmomanometer.

3. When the pulse of radial artery disappears, pressurize it for about 20mm Hg, and then deflate it slowly. When you deflate, you will hear the first regular fluctuation, which will be systolic blood pressure. Continue to deflate slowly.

4. When the beating sound disappears, it is diastolic pressure. The measurement needs to be repeated twice, and the difference between the two measurements is five minutes. Take the average of the two readings. After measuring, you should tilt the sphygmomanometer and turn off the mercury.