Clinical study
Functional class in patients with heart failure is associated with the development of diabetes

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Abstract

Purpose

Recent reports suggest that decreased functional capacity in patients with heart failure may be associated with abnormalities in glucose metabolism. We followed patients with coronary artery disease who participated in the Bezafibrate Infarction Prevention study to determine the incidence of diabetes by baseline functional status during a 7.7-year follow-up.

Methods

The sample comprised 2616 nondiabetic patients aged 45 to 74 years with a fasting blood glucose level <7 mmol/L (126 mg/dL). They were divided into three groups by New York Heart Association (NYHA) criteria: class I (n = 1986 patients), class II (n = 518), and class III (n = 112). The detection of a fasting blood glucose level ≥7 mmol/L during follow-up was defined as the criterion for the development of diabetes.

Results

The study groups had similar demographic and clinical characteristics, except that patients with symptomatic heart failure (NYHA class II or III) were more likely to have angina. During follow-up, diabetes developed in 259 patients (13%) in NYHA class I, 76 (15%) in class II, and 22 (20%) in class III (P for trend = 0.05). At the last visit, patients in NYHA class III were twice as likely (17% [n = 19]) to have fasting blood glucose levels ≥7 mmol/L as those in NYHA class I (7.8% [n = 154]) or class II (8.7% [n = 45]) (P = 0.005). In a multivariate analysis, NYHA class III was associated with a 1.7-fold (95% confidence interval [CI]: 1.1 to 2.6) increase in the rate of development of diabetes, but NYHA class II was not (hazard ratio = 1.0; 95% CI: 0.8 to 1.3).

Conclusion

Among patients with coronary artery disease, advanced heart failure (NYHA class III) is associated with a significantly increased risk of developing diabetes during a 6- to 9-year follow-up.

Section snippets

Subjects

Initially, 15,524 coronary patients were screened for participation in the Bezafibrate Infarction Prevention study, a randomized trial of bezafibrate versus placebo for the treatment of lipid abnormalities, which was performed at 18 university-affiliated hospitals (19). In brief, the inclusion criteria for men and women were age 45 to 74 years; and either a history of myocardial infarction no less than 6 months and not more than 5 years before enrollment, or stable angina pectoris confirmed by

Results

The sample included 1986 patients (76%) in NYHA class I, 518 patients (20%) in class II, and 112 patients (4%) in class III. The three groups were similar in age, sex, and most clinical characteristics (Table 1). The majority of the patients in all groups were men and had sustained a myocardial infarction in the past. A significantly higher proportion of patients in class II or III had angina. Fasting glucose and HDL cholesterol levels were somewhat higher among patients with advanced heart

Discussion

Diabetes, and even relatively mild glucose abnormalities, are strongly associated with cardiovascular morbidity and mortality 3, 23, 24, 25, 26, and diabetes is an independent risk factor for heart failure 12, 13, 14. However, only one previous study, in a group of elderly subjects, reported that heart failure was associated with the subsequent development of diabetes (17). Our results support that observation.

Advanced heart failure leads to increased insulin resistance, characterized by

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