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J Am Coll Cardiol. 2010 Jan 19;55(3):221-30. doi: 10.1016/j.jacc.2009.09.022. Epub 2009 Nov 13.

Normal stress-only versus standard stress/rest myocardial perfusion imaging: similar patient mortality with reduced radiation exposure.

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  • 1Methodist DeBakey Heart and Vascular Center, Houston, Texas 77030, USA.

Abstract

OBJECTIVES:

The aim of this study was to determine whether a normal stress-only single-photon emission computed tomographic myocardial perfusion tomography (SPECT) study confers the same prognosis as a normal SPECT on the basis of evaluation of stress and rest images.

BACKGROUND:

Current guidelines recommend stress and rest imaging to confirm that a SPECT study is normal.

METHODS:

We determined all-cause mortality in 16,854 consecutive patients who had a normal gated stress SPECT. Median follow-up was 4.5 years. A stress-only protocol was used in 8,034 patients (47.6%), whereas 8,820 (52.4%) had both stress and rest imaging.

RESULTS:

The overall unadjusted annual mortality rate in patients who had a normal SPECT with a stress-only protocol was lower than in those who required additional rest imaging (2.57% vs. 2.92%, p = 0.02). After adjustment for baseline clinical characteristics no significant differences in patient mortality were seen between the 2 imaging protocols, but the stress-only group received a 61% lower radiopharmaceutical dosage. Independent predictors of worse survival included increasing age, male sex, diabetes, history of coronary artery disease, and inability to exercise (all p < 0.001) but not the type of SPECT protocol used to image patients.

CONCLUSIONS:

Patients determined to have a normal SPECT on the basis of stress imaging alone have a similar mortality rate as those who have a normal SPECT on the basis of evaluation of both stress and rest images. Our results support that additional rest imaging is not required in patients who have a normally appearing initial stress study. A significant reduction in radiation exposure can be achieved with such an approach.

Copyright 2010 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

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PMID:
19913381
[PubMed - indexed for MEDLINE]
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