[Gradual evaluation of repolarization disorders with ECG mapping].

Area of Science:

• Cardiology
• Medical Diagnostics
• Electrocardiography

Context:

• Chronic coronary heart disease (CHD) diagnosis and severity assessment remain critical clinical challenges.
• Non-invasive diagnostic tools are essential for monitoring myocardial function and guiding treatment.
• Electrocardiography (ECG) is a foundational diagnostic tool in cardiology.

Purpose:

• To evaluate the efficacy of mapping electrocardiography (mECG) in assessing the severity of chronic coronary heart disease (CHD).
• To determine the significance of individual mECG parameters in quantifying repolarization disturbances and myocardial ischemia.
• To establish correlations between mECG findings and the graded severity of CHD.

Summary:

• A study involving 143 participants (31 healthy, 30 borderline, 82 with CHD) utilized a 72-electrode mECG at rest and during submaximal exertion.
• Key mECG parameters, including relative surfaces and ST-segment changes, were correlated with CHD severity.
• Relative surfaces demonstrated significant utility in assessing mild to moderate CHD at rest and all severities during exertion, while total ST-segment depression indicated ischemia extent.

Impact:

• Mapping ECG parameters, particularly relative surfaces, offer a quantitative method for gradual estimation of CHD severity.
• The findings highlight the potential of mECG for comprehensive evaluation, considering extension, intensity, localization, and type of myocardial disturbance.
• This research contributes to refining ECG-based diagnostics for improved management of coronary heart disease.