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[R wave amplitude and left ventricular contractile function in ischemic heart disease]
Insights
Changes in R wave summation (sigma R) during exercise effectively detect coronary artery lesions. Increased sigma R indicates severe atherosclerosis and impaired heart function, while uniform decreases suggest minimal issues.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Ischaemic heart disease diagnosis relies on invasive and non-invasive methods.
- Assessing coronary artery status and myocardial function post-exercise is crucial.
Purpose of the Study:
- To evaluate the diagnostic utility of R wave summation (sigma R) changes during exercise for detecting coronary artery lesions.
- To correlate sigma R changes with myocardial contractile function and exercise tolerance.
Main Methods:
- Compared coronarography and bicycle ergometry data in patients with and without ischaemic heart disease.
- Utilized echocardiography to assess intracardiac hemodynamics after exercise in study groups.
Main Results:
- A sensitive (70%) and specific (88.6%) criterion for detecting coronary artery lesions was identified through sigma R wave changes.
- Increased sigma R post-exercise correlated with significant atherosclerosis, impaired myocardial function, and reduced exercise tolerance.
- Uniform sigma R decrease indicated normal or mild left ventricular changes, observed in single-vessel disease or healthy individuals.
Conclusions:
- Exercise-induced sigma R wave changes are a valuable non-invasive marker for coronary artery disease.
- Sigma R patterns can differentiate between significant coronary artery disease and milder forms or healthy states.
Abstract:
Coronarography and bicycle ergometry data in 70 patients with ischaemic heart disease and in 35 patients with the intact cardiac arteries have been compared. In 42 patients with ischaemic heart disease and in 28 healthy individuals the state of intracardiac haemodynamics after exercise have been studied with echocardiography. It was shown that the changes in the total of R (sigma R) waves in multiple leads serve as a sensitive (70%) and specific (88.6%) criterion to detect lesions of the coronary arteries. The increase of sigma R after exercise is, as a rule, combined with marked atherosclerosis, upset contractile function of the myocardium and decreased tolerance to exercise. Uniform decrease of sigma R in multiple leads points to normal or insignificant changes in the function of the left ventricle and is seen in patients with lesion of one vessel or with intact coronaries.