ECG Waveform Analysis for Myocardial Ischemia Detection
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Solution Overview
Problem
Current methods struggle to accurately monitor myocardial ischemia using electrocardiogram waveforms from ventricular pacing or left bundle branch block due to interference from pacing pulses, making it difficult to distinguish ST values effectively.
Innovation Solution
A physiological information processing instrument and method that employs a processor to judge electrocardiogram waveforms for ventricular pacing or left bundle branch block beats, applies Smith and Sgarbossa criteria for ST measurement, and analyzes results to output myocardial ischemia information audibly or visually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ST value measurement is applied to ventricular pacing or left bundle branch block electrocardiogram waveforms, then myocardial ischemia monitoring is attempted, but the measurement precision deteriorates due to the different waveform shapes and pacing pulse interference
Solution Approach 1:
The patent applies different evaluation criteria (Smith criteria and Sgarbossa criteria) instead of conventional ST value measurement to account for the different waveform characteristics in ventricular pacing and left bundle branch block. This changes the measurement parameters and evaluation thresholds to match the specific conditions, thereby maintaining measurement precision while enabling myocardial ischemia monitoring.
2Measurement precision
If ST value measurement is performed on ventricular pacing beats, then myocardial ischemia evaluation is attempted, but the reliability deteriorates due to confusion caused by pacing pulse interference
Solution Approach 1:
The patent segments the electrocardiogram waveform analysis by specifically identifying and separately evaluating ventricular pacing beats and left bundle branch block beats using characteristic waveform features. This segmentation allows application of appropriate evaluation criteria (Smith or Sgarbossa) to each segment, preventing confusion from pacing pulse interference and improving evaluation reliability.
3Ease of operation
If conventional myocardial ischemia monitoring methods are used, then simple ST value measurement is performed, but the adaptability deteriorates when applied to ventricular pacing or left bundle branch block cases
Solution Approach 1:
The patent creates a universal evaluation system that can handle multiple types of electrocardiogram waveforms (normal sinus rhythm, ventricular pacing, and left bundle branch block) through a single integrated approach. The system automatically identifies the waveform type and applies the appropriate evaluation criteria (conventional ST measurement or Smith/Sgarbossa criteria), thereby achieving both operational simplicity and broad adaptability.
Data Source
AI summary
A physiological information processing instrument according to the presently disclosed subject matter can include a memory that stores instructions, a processor that executes the instructions stored in the memory to judge whether an electrocardiogram waveform of a subject person is of at least one of a ventricular pacing beat and a left bundle branch block beat, to perform an ST measurement by applying myocardial ischemia evaluation criteria to the electrocardiogram waveform that has been judged of at least one of a ventricular pacing beat and a left bundle branch block beat, and to analyze results of the ST measurement and outputs an analysis result and information relating to myocardial ischemia in the form of audible or visible information.