Non-invasive quasi-continuous measurement of systolic blood pressure - by extrapolation from physical calibration into confidence region using e.g. Fourier transform of cardiac second sound

摘要

The blood pressure determination method involves the evaluation of amplitude and frequency information contained in cardiac sounds picked up by a microphone in conjunction with calibration using an inflatable cuff and ECG electrodes for synchronisation of the appts. to the second sound. A specific characteristic vector is worked out in a multidimensional characteristic space marked by e.g. the second relative moment of the short-term acoustic spectrum. USE/ADVANTAGE - For 24-hour patient monitoring. Quasi-continuous measurement can be made on patients with any pulse rate, without subjecting them to any injury or stress.