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Myocardial Perfusion Imaging with Technetium-99m-Sestamibi: Comparative Analysis of Available Imaging Protocols

Departments of Imaging, Medical Imaging Physics and Medicine
Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles
Departments of Medicine and Pharmacology, UCLA School of Medicine, Los Angeles, California

Correspondence: For correspondence or reprints contact: Daniel S. Berman, MD, Department of Imaging, Room 5431, Cedars-Sinai Medical Center, 8700 Beverly Blvd., Los Angeles, CA 90048.

ABSTRACT

Several protocols for rest and stress myocardial perfusion imaging with ^99mTc-sestamibi have been developed, each with distinct advantages and disadvantages. The various approaches have similar sensitivities and specificities for detection of coronary artery disease (CAD), but differ mainly in their ability to identify defect reversibility. The dual-isotope approach, with a rest ²⁰¹Tl study and a stress ^99mTc-sestamibi study, permits optimal evaluation of both stress perfusion and defect reversibility. Gated SPECT may be added to any of the protocols and aids in identifying artifacts, defining regional wall thickening and assessing ventricular function. First-pass ^99mTc-sestamibi radionuclide angiography can add exercise ventricular function data to the study. Clinical trials have shown that the various protocols for ^99mTc-sestamibi provide diagnostic and prognostic information comparable to that derived from traditional ²⁰¹Tl imaging, with the added advantage of higher quality images and increased certainty in interpretation.

Key Words: myocardial perfusion imaging • technetium-99m-sestamibi • ventricular function

FOOTNOTES

This paper was presented in part at the Annual Meeting of the Society of Nuclear Medicine on June 11, 1993, as part of a Continuing Medical Education Seminar organized by the Cardiovascular Council.

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