1. Measurement environment:
Noise: The noisy surrounding environment may interfere with the measurement person's judgment of the sound.
Temperature: An overly cold or overheated environment may cause the measured person's blood vessels to contract or dilate, affecting the blood pressure value.
2. The state of the measured person:
Emotions: Emotions such as tension, anxiety, and excitement may cause blood pressure to rise.
Posture: When measuring, the arm position is higher or lower than the heart level, which will make the blood pressure measurement result inaccurate.
Activities before measurement: Just after strenuous exercise, smoking, drinking, drinking coffee or strong tea, etc., may temporarily increase blood pressure.
3. The measurement person's operation:
Cuff position and tightness: Incorrect cuff position or too loose or too tight will affect the measurement results.
Inflation and deflation speed: Too fast inflation speed and uneven deflation speed may cause measurement errors.
Auscultation skills: The measurement person's inaccurate judgment of the sound, such as mistaking the Korotkoff sound for the disappearance sound, will lead to diastolic blood pressure measurement errors.
4. Equipment factors:
Blood pressure meter failure: such as mercury column not vertical, air leakage, etc.
Stethoscope failure: earplugs or chest piece conduct sound poorly.
5. Physiological factors of the measured person:
Obesity: Excessive fat in the upper arm may affect the compression effect of the cuff and sound conduction.
Atherosclerosis: Reduced vascular elasticity may cause high blood pressure measurements.
