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[Information value of the changes in the ECG elements during graded physical loading in the diagnosis of ischemic
Insights
This study found that the QRS complex area is a valuable integrated index for diagnosing coronary heart disease (CHD) during bicycle ergometry. Analyzing ECGs from 30 men, researchers identified this metric as most significant for CHD detection.
Area of Science:
- Cardiology
- Diagnostic Electrocardiography
Background:
- Coronary heart disease (CHD) diagnosis relies on various clinical and imaging methods.
- Bicycle ergometry is a common stress test for evaluating cardiac function.
- Electrocardiography (ECG) provides crucial data during stress testing.
Purpose of the Study:
- To evaluate the diagnostic value of specific ECG parameters during bicycle ergometry in men with confirmed coronary heart disease.
- To identify the most significant ECG metric for diagnosing CHD during stress testing.
Main Methods:
- Retrospective analysis of 30 ECGs from 30 men with confirmed coronary heart disease (CHD).
- Analysis included R wave amplitude in V5 and V3-V6 leads.
- Calculation of QRS complex area using a geometric method, considering S wave and T wave parameters.
Main Results:
- The area of the QRS complex emerged as the most valuable integrated index for diagnosing CHD during bicycle ergometry.
- Specific measurements of R wave amplitude and T wave characteristics were also considered.
Conclusions:
- The QRS complex area provides a comprehensive assessment of ventricular complex changes.
- This integrated index demonstrates significant diagnostic utility for coronary heart disease in the context of bicycle ergometry.
Abstract:
The authors provide the data obtained on retrospective analysis of 30 ECG recorded in 30 men with coronary heart disease (CHD), confirmed by the clinical and coronarography data, during bicycle ergometry. The amplitude of the R wave in the V5 lead and the total amplitude of the R wave in the V3-V6 leads were analyzed. The area of the QRS complex was calculated as a sum of three triangles. While drawing up a triangle according to the S wave one of the sides went over from the S wave top across the J point till crossing the isoline. The amplitude and duration of the T wave were also taken into consideration. It was established that evaluation of the area of the QRS complex, whose magnitude is an integrated index of changes in all the elements of the ventricular complex, is of the greatest value in the diagnosis of CHD during bicycle ergometry.