Precautions 1. Blood pressure should be measured in a quiet environment. Because human blood pressure changes throughout the day, the measurement should be taken at the same time of day. 2.The person to be measured should remain quiet in a relaxed state, preferably without talking or moving around, and wearing loose clothing is appropriate. 3.Beginners should use a blood pressure monitor or a blood pressure meter under the guidance of a doctor. Judgment of the blood pressure level and treatment plan should be determined by the doctor’s examination. Preparation 1.Open the upper cover of the sphygmomanometer and the switch of the mercury storage bottle, check whether the sphygmomanometer is placed on a relatively horizontal surface, check that it is correct and can be used. 2.Please ask the subject to sit on a chair at the table and maintain a comfortable posture. Place the arm gently on the table and abduct it at 45°. 3.Before wrapping the arm band, leave the arm bare up to the shoulder blade to avoid squeezing of the clothing. Spread the sphygmomanometer arm band flat so that the middle of the air bag is facing the brachial artery and the lower edge of the arm band reaches 3 cm above the elbow socket and is tied to the upper arm. 4, the arm band should not be tied too loose or too tight, generally should be able to insert 1-2 fingers under the arm band as appropriate. 5.Insert 1/3 of the stethoscope probe under the arm band and place it on the brachial artery at the elbow. Adjust the arm sleeve to make it consistent with the level of the heart. If the height is not high enough, add soft padding under the arm. Measure blood pressure 1. Tighten the valve cap and slowly inflate the arm band with a rubber compression balloon and monitor. 2.Pressure until the brachial artery pulsation sound disappears, continue to increase the pressure by 2.5-4kPa (20-30mmHg) and stop pumping. 3.After the pressure is stopped, loosen the valve cap and slowly release the air in the arm band at a rate of 0.5kPa (3-4mmHg) per second, so that the mercury column gradually decreases. 4, pay attention to the monitoring. During the descent, when the first clear “pop” sound pulsation sound is heard through the stethoscope, the mercury column, the pressure value reflected, that is, the systolic pressure. 5, the mercury column continues to fall, the stethoscope in the pulsating sound after gradually enhanced to a soft murmur, followed by a sudden muffled tone, and finally disappeared, at this time the mercury column reflects the pressure value, that is, diastolic blood pressure. 6, measurement of blood pressure should generally be repeated 2-3 times, the resulting value will be averaged as blood pressure to be recorded. 7, the measured blood pressure should be compared with the normal blood pressure. If the blood pressure is too high or too low, it is not normal and should be further checked by a doctor at the hospital.