Method for segmenting arterial pressure signal by beats

Abstract

The invention provides a method for segmenting an arterial pressure signal by beats. The method takes vector differences among points as a base feature. The base feature has translational and rotational invariance and can overcome the influence of baseline drift of the arterial pressure signal; logarithmic polar coordinate conversion is performed on the vector differences to measure the similarity of waveforms; and the measurement is sensitive to morphological characteristics of the adjacent waveforms, can capture global contour information of the waveforms at the same time and has robustnesson waveform swinging; meanwhile, different weightings are given to waveform characteristics before and after points to be measured respectively so as to weaken the influence of beat tail interferencepoints of the arterial pressure signal on beat initial point identification and further improve the rate of the beat initial point identification; and the method further eliminates the interference points in the arterial pressure signal and avoids segmentation chaos by beats by setting appropriate thresholds. The method can precisely segment the arterial pressure signal by beats and contributes to improving capacities of detecting and analyzing arterial pressure analytical 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 for arterial pressure signals 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 blood 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 beginning of each beat in the continuous beat represents the arrival of a pulse wave. The start of two consecutive beats There is a complete beat of the arterial pressure signal, which provides important blood pressure information and heart beat information. The patient's current blood pressure a...

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

In addition, holding your breath and exerting force will also cause corresponding obvious fluctuations in the arterial pressure signal, especially coughing, sneezing and other actions will cause corresponding severe jitter in the arterial pressure signal; if there are such fluctuations or jitter interference in the arterial pressure signal, It is easy to misdetect some of the interference points as the normal beat starting point by using the detection method of the prior art, which leads to the confusion of the beat-by-beat segmentation of the arterial pressure signal

Images