Improper use
1. Improper measurement posture: When measuring, the arm position is too high or too low, and it is not kept at the same level as the heart, which will cause deviations in the measurement results. For example, if the arm is higher than the heart level, it may cause the blood pressure value to be low; if the arm is lower than the heart level, it may cause the blood pressure value to be high. In addition, if the body is not relaxed during measurement, such as bending over, hunching over or crossing the legs, it will also affect the accuracy of blood pressure measurement.
2. Incorrect use of the cuff: The cuff size is not appropriate. If it is too wide or too tight, the measurement value will be low, and if it is too narrow or too loose, the measurement value will be high. If the cuff is not wrapped in the correct position, such as not wrapping it flat on the upper arm, or the lower edge is too far or too close to the elbow, it will also affect the measurement results.
3. Impact of the measurement environment: Measuring in a noisy environment, too low or too high temperature may make the subject nervous or produce a stress response, resulting in blood pressure fluctuations and affecting the accuracy of the measurement.
Equipment problems
1. Not calibrated regularly: Electronic blood pressure monitors need to be calibrated regularly to ensure accuracy. It is generally recommended to calibrate once a year. If it is not calibrated for a long time, it may cause a large deviation in the measurement results.
2. Low battery power: When the battery power is low, the electronic components of the blood pressure monitor may not work properly, resulting in inaccurate measurements, fluctuations in values or large deviations.
3. Equipment damage: If the blood pressure monitor is used for too long, the internal sensors, air pumps and other components may age and be damaged, affecting the measurement accuracy. In addition, external forces such as falls and collisions may also damage the internal structure of the blood pressure monitor, resulting in inaccurate measurement results.
Human body factors
1. Changes in physiological state: The physiological state of the human body during measurement has a greater impact on the blood pressure value. If measured after exercise, after drinking, or when emotional, the blood pressure will increase significantly, which is quite different from the blood pressure value in a calm state.
2. Short measurement time interval: Multiple measurements in a short period of time, because the blood vessels need a certain amount of time to recover after each measurement, continuous measurement will put the blood vessels under pressure, resulting in inaccurate measurement results. It is generally recommended to measure 1-2 minutes apart each time.
3. Influence of special diseases: Certain diseases such as arteriosclerosis and arrhythmia will change the elasticity of blood vessels and blood flow status, increase the difficulty of measurement, and affect the accuracy of electronic blood pressure monitor measurement.
