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Usefulness of exercise myocardial scintigraphy in multivessel coronary disease after incomplete revascularization
Alfredo R Galassi1, Carmelo Grasso, Salvatore Azzarelli
1Clinical Division of Cardiology, Department of Internal Medicine and Systemic Disease, Ferrarotto Hospital, University of Catania, Catania, Italy. argalassi@virgilio.it
Insights
Exercise myocardial scintigraphy effectively predicts cardiac events in patients with incomplete revascularization. Normal scans indicate a low annual event rate, offering valuable prognostic information.
Area of Science:
- Cardiology
- Nuclear Medicine
- Cardiovascular Imaging
Background:
- Incomplete revascularization after percutaneous coronary stenting poses risks.
- Accurate risk stratification is crucial for managing these patients.
- Prognostic value of non-invasive imaging post-procedure needs further evaluation.
Purpose of the Study:
- To assess the prognostic capability of exercise myocardial scintigraphy.
- To determine its value in patients with incomplete coronary revascularization.
- To identify subgroups at higher risk for cardiac events.
Main Methods:
- Prospective study of 322 patients undergoing incomplete revascularization.
- Exercise technetium-99m-tetrofosmin single-photon emission computed tomography scintigraphy performed 4-6 months post-procedure.
- Long-term follow-up (median 33 months) for cardiac events.
Main Results:
- Patients with normal scintigraphy had significantly lower cardiac event rates (1.5% yearly) compared to abnormal scans (5.1% and 8.5%).
- Scintigraphy findings significantly predicted hard, soft, and composite cardiac events.
- Nuclear data provided incremental prognostic value beyond clinical, angiographic, and exercise test data.
Conclusions:
- Exercise myocardial scintigraphy is an independent predictor of cardiac events in patients with incomplete revascularization.
- Normal scans identify patients with a low annual event rate (<2%).
- This imaging modality offers crucial prognostic information for guiding patient management.
Abstract:
The aim of this prospective study was to evaluate the prognostic value of exercise myocardial scintigraphy in patients who undergo incomplete revascularization with percutaneous coronary stenting. In 322 consecutive patients (mean age 61 +/- 10 years), exercise technetium-99m-tetrofosmin single-photon emission computed tomography scintigraphy was prospectively performed 4 to 6 months after an incomplete revascularization procedure. Follow-up lasted < or = 84 months (median 33). Patients with normal findings were at low risk of cardiac events compared with patients with mildly abnormal and severely abnormal findings (yearly event rate 1.5% vs 5.1% and 8.5%, respectively, p < 0.01). A significant difference was observed in hard, soft, and composite event-free survival among patients with normal, mildly abnormal, and severely abnormal findings (p < 0.01, p < 0.03, and p < 0.01, respectively). Nuclear data provided significant incremental prognostic value for cardiac events compared with the clinical, angiographic, and exercise test findings. In conclusion, in patients with incomplete revascularization procedures, exercise myocardial scintigraphy provides significant independent information concerning the subsequent risk of cardiac events, with an annualized event rate of < 2% for patients with normal scan findings. Myocardial scintigraphy is able to provide incremental prognostic information after adjusting for clinical, angiographic, and exercise variables.
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