Prognostic stratification using dobutamine stress 99mTc-tetrofosmin myocardial perfusion SPECT in elderly patients unable to perform exercise testing.
Information on the prognostic value of noninvasive stress imaging techniques in the elderly is relatively scarce. This study assessed the prognostic value of dobutamine stress (99m)Tc-tetrofosmin SPECT for the prediction of mortality and cardiac events in elderly patients.


METHODS
Clinical information and SPECT results were analyzed for 272 consecutive patients > or = 65 y old (mean age, 71 +/- 5 y; range, 65-87 y) with limited exercise capacity. Follow-up was complete in 270 patients (99.3%); 23 underwent revascularization within 60 d of the scintigraphy and were excluded. Abnormal findings were defined as the presence of a fixed or reversible perfusion defect. A summed stress score was obtained to estimate the extent and severity of perfusion defects. The incremental prognostic value of SPECT over clinical data was evaluated according to 3 multivariate models, which included any SPECT abnormality, the presence of a fixed or reversible defect, and the summed stress score.


RESULTS
During the follow-up (3.3 +/- 1.4 y), 59 patients died (29 cardiac deaths), 16 had a nonfatal infarction, and 49 underwent late revascularization. Abnormal scan findings were present for 140 patients (57%). The annual event rates for total mortality, cardiac death, and cardiac death or nonfatal infarction were, respectively, 3.2%, 0.2%, and 0.7% when scan findings were normal and, respectively, 9.5%, 4.3%, and 8% when scan findings were abnormal (all P < 0.0001). Multivariate analysis showed that abnormal scan findings, the presence of a fixed or reversible defect, and the summed stress score provided incremental prognostic information over clinical data. The presence of abnormal scan findings was independently associated with an increased risk for total mortality, cardiac death, and cardiac death or nonfatal infarction (respectively, hazard ratio 3.4 [95% CI, 1.8-6.5], 12.1 [95% CI, 2.9-51.5], and 9.0 [95% CI, 2.8-29.6]).


CONCLUSIONS
Dobutamine stress (99m)Tc-tetrofosmin SPECT provides incremental prognostic information for the prediction of total mortality and cardiac events in elderly patients.
Schinkel
Arend F L
AF
Department of Cardiology, Thoraxcenter Room Ba 302, Erasmus Medical Center, Dr. Molewaterplein 40, 3015 GD Rotterdam, The Netherlands.
Elhendy
Abdou
A
Biagini
Elena
E
van Domburg
Ron T
RT
Valkema
Roelf
R
Rizello
Vittoria
V
Pedone
Chiara
C
Simoons
Maarten
M
Bax
Jeroen J
JJ
Poldermans
Don
D
D000368:Aged; D000369:Aged, 80 and over; D015984:Causality; D015897:Comorbidity; D003324:Coronary Artery Disease / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000401:mortality*; D004280:Dobutamine; D005080:Exercise Test; D005260:Female; D015577:Geriatric Assessment / Q000379:methods / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000401:mortality; D009426:Netherlands / Q000453:epidemiology; D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D011379:Prognosis; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D012680:Sensitivity and Specificity; D016019:Survival Analysis; D015899:Tomography, Emission-Computed, Single-Photon / Q000706:statistics & numerical data*
D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; D004280:Dobutamine; C078700:technetium tc-99m tetrofosmin