The use of mechanical sphygmomanometer includes the steps of pre-check preparation, cuff binding, blood pressure measurement and resetting the sphygmomanometer.
1. Pre-examination preparation: Ask the patient to sit quietly or lie down for about 25 minutes, and avoid holding urine, smoking, emotional excitement and other activities that can have a significant impact on blood pressure.
2. Cuff binding: take off the clothes of one side of the upper arm, exhaust the air inside the cuff of the sphygmomanometer, tie the cuff on the upper arm, the lower edge is higher than the elbow joint 2~3 horizontal fingers, the tightness is to accommodate more than two fingers shall prevail, not too loose or too tight.
3. Measurement of blood pressure: touch the inner side of the elbow joint, place the cuff of the stethoscope at the most obvious place of the beat, and fix it with the left hand, close the valve with the right hand and inflate the cuff. After the last beat is heard, continue to pressurize so that the mercury column rises by 20 mmHg, then slowly release the valve and gaze horizontally at the mercury column. The value corresponding to the first tap sound is systolic blood pressure, and the value corresponding to the disappearance of the tap sound is diastolic blood pressure.
4. Reset the sphygmomanometer: After the measurement, remove the cuff, let the air out of the cuff, fold it for storage, turn off the switch under the mercury column, and store the sphygmomanometer.
Blood pressure measurements often need to be taken twice and averaged to obtain more accurate results.