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Noninvasive recording of the his-purkinje system electrical activity by a digital system design
Insights
This study presents a noninvasive technique to record the heart's His-Purkinje system (HPS) electrical activity. This method offers a safer alternative to cardiac catheterization for diagnosing HPS abnormalities.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- The heart's atrioventricular conduction pathways, including the atrioventricular node and His-Purkinje system (HPS), regulate ventricular conduction.
- Diagnosing His-Purkinje system abnormalities typically requires invasive cardiac catheterization, which carries risks and limitations.
Purpose of the Study:
- To outline a novel noninvasive technique for recording the His-Purkinje system's electrical activity from the body surface.
- To introduce a portable instrument designed for this noninvasive His-Purkinje system recording.
Main Methods:
- Utilizing high gain, wide band filtering, and coherent signal averaging to extract faint HPS electrical signals.
- Developing a portable instrument featuring a low-noise differential amplifier, a digital QRS detector for accurate triggering, and a digital memory averager.
Main Results:
- Successfully extracted the electrical activity of the His-Purkinje system at the body surface using the developed noninvasive technique.
- The designed instrument integrates key components for signal amplification, detection, and averaging.
Conclusions:
- The developed noninvasive technique and instrument provide a viable, safer alternative to cardiac catheterization for HPS assessment.
- This technology can serve as an automatic clinical tool or a data acquisition system for various low-level electrophysiological signals.
Abstract:
The atrioventricular conduction pathways which are composed of the atrioventricular node and the His-Purkinje system (HPS) form a specialized conduction system in the heart that participates in the control of the ventricular conduction. His bundle recordings require cardiac catheterization in the diagnosis of abnormalities within the HPS. These recordings have limitations that include discomfort, a slight morbidity risk, and limited recording area within the heart. This report outlines a noninvasive technique that utilizes high gain, wide band filtering and coherent signals averaging to extract the electrical activity of the HPS at the body surface. We have designed a portable instrument which enables: (i) a high gain, very low noise, optically isolated differential amplifier, (ii) an online digital QRS detector based on the principle of contour limiting which detects the desired QRS complexes and generates a very accurate trigger for the coherent signal averaging; (iii) a digital memory averager. This instrument can be used as an automatic clinical tool or as a data acquisition and preprocessing system for high frequency ECG and many other low level electrophysiological signals.