Method for dividing arterial pressure signal beat by beat

Abstract

The invention provides a method for dividing an arterial pressure signal beat by beat. The method identifies a starting point of the beat of the arterial pressure signal through waveform characteristic extracting and template matching; takes error vectors among points as the basic characteristic, wherein the basic characteristic has a translation and rotation invariance property, thereby being capable of overcoming the influence caused by the baseline drift of the arterial pressure signal; performs the log polar transformation to the error vectors, and divides regions of the error vectors to measure the similarity of the waveform, wherein the measurement is sensitive to the morphological characteristics of adjoining waveforms; and can acquire the global outline information of the waveformand has robustness to the shaking of the waveform, so that the method which transforms the measurement of the similarity among the points into the measurement of the waveform of the points can exactly identify and detect the starting point of the beat of the arterial pressure signal. The method is applied to the relevant arterial pressure analyzing equipment, can exactly divide the arterial pressure signal beat by beat, and is good for improving the detecting and analyzing capability of the arterial pressure analyzing equipment.

Description

technical field [0001] The invention relates to the technical field of automatic detection and analysis of arterial pressure, in particular to a beat-by-beat segmentation method of arterial pressure signal based on waveform feature extraction and template matching. Background technique [0002] The arterial pressure signal carries important physiological and pathological information, such as the incidence and reflection of blood flow, cardiac stroke function, and the elasticity and stiffness of the arterial wall. The arterial pressure signal fluctuates with the beating of the heart. It is a quasi-periodic beat-by-beat signal that propagates in a continuous fluctuating manner. The starting point of each beat in the continuous beat-by-beat represents the arrival of a pulse wave. The interval is a complete beat of the arterial pressure signal, which provides important blood pressure information and heart beat information, and the patient's current blood pressure and heart param...

AI Technical Summary

Problems solved by technology

For example, if figure 2 The arterial pressure signal shown, where the point p 2 is the beat starting point of the actual signal beat, point p 1 It is only the variability interference point of the wave tail part of the beat before the start of the beat; but whether the method of calculating the amplitude or the method of calculating the local minimum point is used, the interference point p 1 Misjudged as the beat starting point of the arterial pressure signal, resulting in inaccurate beat-by-beat segmentation of the arterial pressure signal, which will affect to a certain extent the detection accuracy of the arterial pressure analysis equipment for heart rate, systolic blood pressure, and diastolic blood pressure in the subsequent process

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