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Nuclear Medicine |
1 From the Departments of RadiologyNuclear Medicine (S.B.N., M.W.H., R.A.P., G.R., R.E.C.) and MedicineCardiology (S.B.N., A.J., L.K.S., D.F.K., M.W.H.), Duke University Medical Center and Health Systems, Duke North Rm 1410, PO Box 3949, Durham, NC 27710. Received May 3, 1999; revision requested June 16; final revision received October 18; accepted October 20. Address correspondence to S.B.N. (e-mail: borge001@mc.duke.edu.)
PURPOSE: To investigate the relationship between the development of ischemia during stress testing and the changes in left ventricular ejection fraction (LVEF) measurements obtained after stress and at rest with a same-day perfusion-function imaging protocol.
MATERIALS AND METHODS: One hundred twenty-six patients underwent a same-day rest-stress (61%) or stress-rest (39%) protocol and gated single photon emission computed tomography (SPECT). Perfusion analysis was performed with a 12-segment model. Defects were scored (0 = no defect, 1 = mild defect, 2 = moderate defect, and 3 = severe defect); differences between the summed stress and resting scores of greater than three indicated substantial ischemia.
RESULTS: Resting and poststress LVEFs correlated significantly (r = 0.97, P < .001); however, patients with and patients without ischemia had significant differences in poststress versus resting LVEFs (-4.0 vs 1.0, respectively; P < .01). In patients with ischemia versus patients without ischemia, subgroup analysis stress-rest (-2.5 vs 1.0, P = .047) and rest-stress (-4.0 vs 1.0, P = .006) protocols yielded similar results.
CONCLUSION: In patients with clinically important stress-induced perfusion abnormalities, the LVEF after stress was significantly lower than the LVEF at rest with same-day rest-stress and stress-rest imaging protocols. In the clinical setting, poststress LVEFs may be lower than true resting measurements, particularly in patients with moderate to severe stress-induced ischemia.
Index terms: Heart, ejection fraction Heart, function Myocardium, ischemia, 511.1939 Myocardium, radionuclide studies, 511.1939, 511.12171 Myocardium, SPECT, 511.1939, 511.12162 Receiver operating characteristic (ROC) curve Single photon emission computed tomography (SPECT), 511.12162
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