A&D TM-2441 Instruction Manual
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Contents
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8911. Appendix11.1. Principle of Blood Pressure MeasurementMeasurement procedure : Wrap the cuff around the upper arm.Inflate the cuff to a pressure exceeding the systolic blood pressure.Then, exhaust the air from the cuff gradually. While the pressure isdetected in the cuff in the air exhaustion stage, the pulse waveformappears in synchronization with the heartbeat. The pulse waveformsuddenly increases near the systolic blood pressure. It increasesfurther with exhaustion until it reaches the highest in amplitude, thendecreases gradually. The changes in the pulse waveform areillustrated at next page. In the oscillometric blood pressuremeasurement, the systolic blood pressure is specified as the pointwhere the amplitude increases suddenly after the pulse in the cuffpressure is detected, the mean blood pressure is specified as thepoint where the amplitude reaches the highest, the diastolic bloodpressure is specified as the point where the amplitude decreasesgradually and becomes small. Actually, the pressure sensor detectsthe subtle changes in the cuff pressure with time, stores the pulsewaveform in memory, and evaluates the systolic and diastolic bloodpressures according to the oscillometric measurement algorithm.The details in the algorithm vary with the blood pressure monitor.Blood pressure values of adults and infants are measured by theoscillometric method and are compared with those measured by theauscultatory method. Diastolic blood pressure is defined to be theend point of phase 4 in the auscultatory method. The pulsewaveform of the cuff pressure depends on the characteristics of thecuff material. Therefore, by using the specified cuff and themeasurement algorithm, the measurement accuracy is maintained.Air hose length is within 3.5 m because of the dampingcharacteristics due to pulse wave propagation. |
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