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[Prognostic value of exercise gamma-angiography in coronary insufficiency]
S Witchitz1, J N Talbot, A Boubaker
1Service de cardiologie, hôpital de Bicêtre, Le Kremlin-Bicêtre.
Insights
Exercise ejection fraction and exercise-induced chest pain are key predictors of cardiac events in stable coronary artery disease patients. These factors help identify patients at higher risk for cardiac complications or revascularization procedures.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Stable coronary artery disease (CAD) management relies on predicting cardiac events.
- Risk stratification is crucial for optimizing medical therapy and interventions.
Purpose of the Study:
- To analyze the predictive value of radionuclide angiography and exercise stress testing for cardiac events in stable CAD patients.
- To identify independent prognostic factors for cardiac complications and myocardial revascularization.
Main Methods:
- Retrospective analysis of 105 stable CAD patients (93 men, 12 women) followed for 1-8 years.
- Utilized resting and exercise radionuclide angiography and conventional exercise stress testing.
- Patients categorized into groups based on cardiac events (spontaneous complications, revascularizations).
Main Results:
- Exercise ejection fraction (EF) and exercise-induced chest pain were independent prognostic factors.
- Significant differences between groups at 2 years and end-of-follow-up included exercise EF, resting EF, EF difference, and exercise duration.
- Exercise EF best predicted cardiac death; chest pain and ST depression best predicted myocardial revascularization.
Conclusions:
- Exercise EF and exercise-induced chest pain are valuable predictors of cardiac events in stable CAD.
- Radionuclide angiography parameters, particularly exercise EF, offer significant predictive value.
- These findings aid in refining risk assessment and guiding treatment strategies for stable CAD.
Abstract:
The predictive value for cardiac events in stable coronary artery disease was analysed with resting and exercise radionuclide angiography and conventional exercise stress testing under medical therapy. The population comprised 93 men and 12 women, followed up for 1 to 8 years (mean 51 months). The patients were divided into two groups. Group I without cardiac events; Group II including spontaneous complications and myocardial revascularisations. The analysis was performed at 2 years and at the end of follow-up. At 2 years, 30 events (15 spontaneous complications, 15 revascularisations) were observed, and at the end of follow-up, there were 61 uncomplicated outcomes and 44 cardiac events (22 spontaneous complications, 22 revascularisations). Two independent prognostic factors distinguishing patients in Group I from those in Group II were identified at 2 years and at the end of the study: exercise EF and occurrence of exercise (on: chest pain on exercise) chest pain. Four parameters were significantly different between the two groups at 2 years: exercise EF, resting EF, difference between exercise-resting EF (all p < 0.005) and duration of exercise testing (p = 0.04). The 3 radionuclide parameters remained different between the 2 groups as well as chest pain on exercise stress testing (p = 0.03) throughout the study. The predictive value of these parameters depended on the type of cardiac event. The exercise EF was the best predictive factor of cardiac death. Pain and ST depression on exercise ECG were the best predictive factors for myocardial revascularisation. In 12 patients undergoing myocardial revascularisation, the clearest improvement was observed in exercise EF (p = 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)