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Incidence of coronary heart disease in type 2 diabetic men and women: impact of microvascular complications, treatment and geographic location.

¹Division of Metabolic Diseases, University of Padua
²Metabolism and Diabetes Unit, ASL 8, Regione Piemonte, Chieri
³National Institute of Health, Rome
⁴University of Florence and Azienda Ospedaliera Careggi, Florence
⁵Federico II University, Naples
⁶Casa di Cura Pineta del Carso, Aurisina, Trieste
⁷Department of Internal Medicine and C.N.R. Institute of Clinical Physiology, University of Pisa School of Medicine, Pisa, Italy

ferranni{at}ifc.cnr.it

ABSTRACT

OBJECTIVE: Cardiovascular disease (CVD) is the main cause of morbidity/mortality in diabetes. We set forth to determine incidence and identify predictors (including microvascular complications and treatment) of first coronary heart disease (CHD) event in CVD-free type 2 diabetic patients.

RESEARCH DESIGN AND METHODS: A cohort of 6,032 women and 5,612 men, sampled from the nationwide network of hospital-based diabetes clinics, was followed up for 4 years. Baseline assessment included retinopathy, nephropathy, and foot ulcers. First CHD events (myocardial infarction, CABG, PTCA, and ECG-proven angina) were analyzed for 29,069 person-years.

RESULTS: The age-standardized incidence rate (per 1,000 person-years) of first CHD event (n=881) was 28.8[95%CI:25.4-32.2] in men and 23.3[20.2-26.4] in women. Major CHD (myocardial infarction, CABG, PTCA) was less frequent in women (5.8[4.3-7.2]) than in men (13.1[10.9-15.4]), a gender ratio of 0.5[0.4-0.6]. Incidence rates of all outcomes were higher in patients with microvascular complications (for major CHD, age-adjusted rate-ratios were 1.6[1.2-2.21] in men and 1.5[1.0-2.2] in women). By multivariate Cox analysis, age and diabetes duration were risk predictors common to both genders. In men, glycemic control and treated hypertension were additional independent risk factors but residing in the south was associated with a significant, 29% risk reduction; in women, higher triglycerides/lower HDL-cholesterol and microvascular complications were independent risk factors.

CONCLUSIONS: In CVD-free patients with type 2 diabetes, risk of first CHD depends on gender, geographic location, and presence of microvascular disease. Hyperglycemia and hypertension, particularly in men, and diabetic dyslipidemia, especially in women, are risk factors amenable to more aggressive treatment.

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