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Prognostic value of gated SPECT after reperfusion for acute myocardial infarction
Lázaro O Cabrera-Rodríguez1, Amalia T Peix, Kenia M Padrón
1nuclear medicine department, Cardiology and Cardiovascular Surgery Institute, Havana, Cuba. cardiomar@infomed.sld.cu
Insights
Cardiac-gated SPECT effectively predicts major cardiac events in myocardial infarction patients after reperfusion therapy. Left ventricular dilation, specifically end-systolic volume >70 mL, is a key indicator of poor prognosis.
Area of Science:
- Cardiology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Myocardial reperfusion post-acute myocardial infarction improves prognosis but clinical outcomes vary.
- Assessing residual ischemia and viable myocardium is crucial for prognostic stratification.
- Cardiac-gated SPECT offers noninvasive parameters for patient management.
Purpose of the Study:
- To evaluate the prognostic value of myocardial perfusion scintigraphy in predicting major cardiac events.
- To assess perfusion and cardiac function in myocardial infarction patients treated with reperfusion therapies.
- To determine if cardiac-gated SPECT parameters can stratify risk in these patients.
Main Methods:
- Forty myocardial infarction patients treated with primary percutaneous transluminal coronary angioplasty or thrombolysis were included.
- Cardiac-gated SPECT was performed to assess myocardial perfusion and left ventricular function.
- Patients were followed for six months for major cardiac events.
Main Results:
- A nonsignificant increase in perfusion defect extent was observed in patients with major cardiac events.
- Significant increases in end-diastolic and end-systolic volumes, with decreased ejection fraction, were noted.
- Post-stress end-diastolic volume ≥70 mL demonstrated high prognostic value for major cardiac events (AUC 0.835).
Conclusions:
- Cardiac-gated SPECT identifies predictive variables for major cardiac events in reperfused myocardial infarction patients.
- Left ventricular systolic dysfunction and cavity dilation, particularly end-systolic volume >70 mL, are significant predictors.
- These findings are independent of the reperfusion treatment modality used.
Introduction:
Myocardial reperfusion during the course of an acute myocardial infarction improves patients' short- and long-term prognosis; coronary blood flow is successfully re-established while preserving a large amount of at-risk muscle. Clinical evolution, however, varies. Presence of residual ischemia or viable myocardial tissue affects a patient's prognosis. Assessment by noninvasive methods allows better prognostic stratification. Cardiac-gated SPECT provides appropriate parameters to support treatment selection and monitoring of these patients.
Objectives:
Assess the prognostic value--ability to predict occurrence of major cardiac events--of perfusion and cardiac function obtained by myocardial perfusion scintigraphy in myocardial infarction patients treated by any myocardial reperfusion method, whether pharmacological or surgical.
Methods:
Forty patients were included, mean age 58.8 ± 9 years, diagnosed with myocardial infarction. Participants were divided into two groups: primary percutaneous transluminal coronary angioplasty (15) or thrombolysis (25). All received myocardial perfusion scintigraphy with cardiac-gated SPECT to assess perfusion and left ventricular function, and were followed for six months with telephone interviews and review of clinical records.
Results:
In the 11 patients who had major cardiac events within six months of followup, a nonsignificant increase in perfusion defect extent was seen post reperfusion. Six (54.5%) of those with major cardiac events had anterior perfusion defects. In functional parameters, a significant increase in end-diastolic and end-systolic volumes and decrease in left ventricular ejection fraction were observed post stress (p = 0.006) and at rest (p = 0.001). Post-stress end-diastolic volume of ≥70 mL had a higher prognostic value for major cardiac events [sensitivity 100%; specificity 89%, area under ROC curve 0.835 (CI 0.702-0.969), p = 0.001].
Conclusions:
Cardiac-gated SPECT is useful to identify variables (including left ventricular systolic dysfunction and dilation of left cavities, particularly left end-systolic volume of >70 mL) predictive of major cardiac events in reperfused patients, independent of treatment modality.
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