Because the value measured by the oscillometric method fluctuates, there is no regularity, and there may be several maximum values, so the calculated data cannot truly reflect the value of blood pressure. Therefore, the oscillometric method of measuring blood pressure is also based on assumptions. First, the test subject’s waveform is standardized; second, the formulas and coefficients (0.45 and 0.75) used to calculate the blood pressure value are the same as those of the test subject. In general, healthy people can roughly conform to this coefficient. Unhealthy People often do not meet, but only unhealthy people need a blood pressure monitor more. The judgment basis of the oscillometric method is given by statistical methods through a large number of population experiments, so this measurement method will inevitably cause measurement errors for some populations, and sometimes the error can reach tens of millimeters of mercury. According to statistics, the oscillometric method is only suitable for 70% of the population, and for the other 30%, the error is large. For the same person, the oscillometric method is sometimes accurate, sometimes the error is large.

Use a mineral water bottle to fill 3/4 of the water, fix the cuff of the oscillometric sphygmomanometer to the outside of the mineral water bottle, shake the mineral water bottle rhythmically, the oscilloscope sphygmomanometer will give corresponding readings to prove the oscillometric method The reading of the sphygmomanometer is unreliable under certain conditions. Using the same method, it is absolutely impossible for a pulse wave sphygmomanometer to give a reading.

The oscillometric sphygmomanometer uses empirical data to determine blood pressure readings, but it is only suitable for blood pressure measurement in a calm state, and cannot be used for post-exercise blood pressure measurement. When performing exercise blood pressure measurement, the pulse wave sphygmomanometer and the oscilloscope sphygmomanometer are used to measure the blood pressure of both arms at the same time, and the blood pressure value is recorded.