Ejection-period-impedance-index-based adaptive method of pacing rate of cardiac pacemaker

Abstract

The invention provides an ejection-period-impedance-index-based adaptive method of a pacing rate of a cardiac pacemaker. The method comprises: step one, collecting a heart chamber impedance waveform; step two, carrying out peak point and valley point detection on the collected waveform; step three, determining whether a wrong waveform occurs at each cardiac cycle measurement result obtained by the step 2; if so, abandoning the data and collecting an intracardiac impedance waveform again; and if not, carrying out a step four; step four, according to the detected peak point and the valley point, carrying out base line adjustment on the impedance waveform value measured in the cardiac cycle; step five, carrying out integration processing on the impedance waveform after base line adjustment and solving an ejection period impedance index; step six, determining whether counted continuous working hours reach 24 hours; if so, carrying out a step seven and adjusting an upper limit and a lower limit of the ejection period impedance index and an automatic reaction coefficient; and if not, skipping over the step seven and carryint out a step eight to determine a current pacing frequency.

Description

technical field [0001] The invention belongs to the field of biomedical engineering, and relates to a frequency adaptive method of a cardiac pacemaker, in particular to a cardiac pacemaker pacing frequency adaptive method based on an impedance index during ejection period. Background technique [0002] Since the advent of artificial cardiac pacing, cardiac pacemakers have made great progress in physiological pacing and pacing frequency adaptation. A series of pacing frequency adaptive sensing parameters such as volume and intraventricular impedance can mimic the function of the normal heart sinoatrial node as naturally as possible when facing different intensities of exercise and other metabolic needs such as anxiety, mental stress, and fever. Provide timely and appropriate blood supply. [0003] Compared with the open-loop system that senses body motion acceleration and other parameters, the frequency-adaptive system that senses intraventricular impedance parameters uses t...

AI Technical Summary

Problems solved by technology

However, in practical applications, because the window of the region of interest is very short, the sampling rate of the impedance waveform is high, which is inevitably limited by the power consumption of the pacemaker.

[0007] In summary, limited by the power consumption of cardiac pacemakers, the sampling rate of the frequency adaptive algorithm for sensing intraventricular impedance parameters should be as low as possible, and it can still maintain high accuracy at low sampling rates. It becomes an irreconcilable contradiction in the application, which limits the further application of the frequency adaptive algorithm in clinical practice.

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