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Revista chilena de cardiología

On-line version ISSN 0718-8560

Abstract

MASSARDO, Teresa et al. FIVE YEAR FOLLOW-UP IN DIABETICS WITHOUT ARTERY DISEASE SYMPTOMS UNDERGOING EXERCISE STRESS AND SPECT MYOCARDIAL PERFUSION IMAGING. Rev Chil Cardiol [online]. 2013, vol.32, n.3, pp.187-195. ISSN 0718-8560.  http://dx.doi.org/10.4067/S0718-85602013000300002.

The clinical value of myocardial perfusion studies in cardiac asymptomatic patients with Diabetes Mellitus (DM) is controversial. Aim: To conduct a 5 year follow-up study to detect major adverse cardiac events in asymptomatic DM patients using exercise stress and SPECT myocardial perfusion imaging. Methods: 40 patients with known DM for at least 5 years and without evidence of coronary artery disease, older than 45 years of age with >2 cardiovascular risk factors (CVRF) and either normal or minimally altered ECG underwent adequate exercise testing (ET) and 99mTc Sestamibi, repeated 3 years later in 32 cases. We also assessed 36 non-diabetic control patients, with >2 CVRF. Mean follow up was 64±11 months. Results: 48% of DM patients had HbA1c >7.5%; in them, the SPECT showed silent ischemia (SI) in 30% and positive ET in 18%. There were no significant variations in SPECT at 3 years. There was 1 non-cardiac death in the 2nd year and 2 deaths, one from acute myocardial infarction associated to minimal septal ischemia and another associated with cardiomyopathy and heart failure, with a fixed perfusion defect. Both patients had a negative ET. In the control group, 11% had abnormal SPECT and 8% positive ET and no cardiac deaths were observed. The Odds ratio for ischemia between DM and controls was 3.42 [CI=0.99-11.85 ] and the Hazard Ratio for cardiac events was 6.746 [CI=0.4205-108.2]. Conclusions: In asymptomatic coronary DM patients, the presence of SPECT ischemia detect was higher than in non-DM controls with CVRF. The incidence of major cardiac events was higher, although not significantly, in DM than control patients. This finding should be re-evaluated in the multicenter study.

Keywords : Diabetes Mellitus; Silent Ischemia; Myocardial Perfusion; SPECT.

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