CLINICAL STUDIES
Risk assessment using single-photon emission computed tomographic technetium-99m sestamibi imaging
Sherif Iskander, MDa and
Ami E. Iskandrian, MD, FACCa
a Division of Cardiology, Department of Medicine, MCPHahnemann School of Medicine, Allegheny University of the Health Sciences, Philadelphia, Pennsylvania, USA
Manuscript received December 24, 1997;
revised manuscript received March 16, 1998,
accepted March 20, 1998.
Address for correspondence: Ami E. Iskandrian, Cardiovascular Research Center, Allegheny University of the Health Sciences, 230 North Broad Street, Mail Stop 471, Philadelphia, Pennsylvania 19102 iskandrian{at}auhs.edu
Objectives. This review summarizes the results of single-photon emission computed tomographic (SPECT) technetium-99m (Tc-99m) tracer imaging in patients with stable symptoms, patients with acute coronary syndromes, patients undergoing major noncardiac surgery and patients with chest pain in the emergency department.
Background. Previous studies have examined the prognostic value of stress thallium imaging in several subsets of patients with ischemic heart disease. At present, >50% of myocardial perfusion studies are performed with technetium-labeled tracers in the United States. Furthermore, there is a shift from diagnostic to the prognostic utility of stress testing. There are important differences between technetium-labeled tracers and thallium-201. It is therefore important to review the prognostic value of technetium-labeled tracers.
Methods. We analyzed published reports in English on risk assessment using Tc-99m perfusion tracers.
Results. The largest experience is in patients with stable symptoms, comprising >12,000 patients in 14 studies. In these patients, normal stress SPECT sestamibi images were associated with an average annual hard event rate of 0.6% (death or nonfatal myocardial infarction [MI]). In contrast, patients with abnormal images had a 12-fold higher event rate (7.4% annually). Both fixed and reversible defects are prognostically important, and quantitative analysis shows increased risk in relation to the severity of the abnormality. These results are similar to those obtained with thallium-201.
Conclusions. Patients with stable chest pain syndromes and normal stress SPECT sestamibi images have a very low risk of death or nonfatal MI. It is highly unlikely that coronary revascularization can improve survival in such patients. Patients with abnormal images have an intermediate to high risk for future cardiac events, depending on the degree of the abnormality. Further prospective studies comparing aggressive medical therapy with coronary revascularization in these patients are warranted.
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Abbreviations and Acronyms
| | CABG | = coronary artery bypass graft surgery | | CAD | = coronary artery disease | | LV | = left ventricular | | LVEF | = left ventricular ejection fraction | | MI | = myocardial infarction | | PTCA | = percutaneous transluminal coronary angioplasty | | SPECT | = single-photon emission computed tomography (tomographic) | | Tc-99m | = technetium-99m | | Tl-201 | = thallium-201 |
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