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Combined rest and exercise electrocardiographic repolarization findings in relation to structural and functional
Insights
Rest and exercise ECG abnormalities can indicate left ventricular issues in aortic regurgitation patients. Abnormalities on resting ECG and exercise tests are linked to significant cardiac changes.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Electrophysiology
Background:
- Asymptomatic chronic pure aortic regurgitation can lead to left ventricular (LV) abnormalities.
- Electrocardiography (ECG) is a non-invasive tool to assess cardiac health.
Purpose of the Study:
- To examine the relationship between rest and exercise ECG repolarization abnormalities and LV geometry/function in patients with aortic regurgitation.
Main Methods:
- Compared echocardiographic and radionuclide cineangiographic findings in 48 patients.
- Grouped patients based on resting ECG "strain" pattern and exercise ECG response.
- Analyzed LV dimensions, mass, wall stress, and ejection fraction changes.
Main Results:
- Resting ECG "strain" pattern strongly correlated with LV geometric and functional abnormalities.
- Abnormal exercise ECG response independently associated with abnormal LV systolic dimension.
- Patients with abnormal resting and exercise ECGs showed high prevalence of LV dysfunction (50-83%).
Conclusions:
- Rest and exercise ECG abnormalities are associated with left ventricular dysfunction in aortic regurgitation.
- ECG findings may aid in serial evaluation of these patients.
- Further research can refine ECG's role in managing aortic regurgitation.
Abstract:
The relationship of combined rest and exercise electrocardiographic (ECG) repolarization abnormalities to left ventricular geometry and function was examined in 48 patients with asymptomatic chronic pure aortic regurgitation and no recent use of digitalis. Echocardiographic and radionuclide cineangiographic findings were compared in groups defined by the presence or absence of the "strain" pattern of repolarization abnormality on the resting ECG and also by the presence or absence of standard positive repolarization changes during upright treadmill exercise ( > 0.1 mV additional horizontal or downsloping ST depression). These hierarchic groups demonstrated trends toward progressively abnormal left ventricular dimensions, mass, wall stress, and change in ejection fraction with exercise. Although the presence of the strain pattern on the resting ECG alone was most strongly correlated with underlying functional and geometric abnormalities, an abnormal exercise test response was independently associated with abnormal left ventricular systolic dimension. The large group of patients with no symptoms and normal resting repolarization had only 0% to 4% prevalences of markedly increased systolic dimension (> 55 mm), reduced ejection fraction at rest (< 45%), or reduced ejection fraction during exercise (< 40%), whereas the small group of patients with abnormal resting repolarization and a positive exercise test response had 50% to 83% prevalences of these findings. These data suggest a possible role for rest and exercise ECG in the serial evaluation of patients with aortic regurgitation.