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Abstract

A PROPENSITY-MATCHED STUDY OF THE EFFECT OF DIABETES ON THE NATURAL HISTORY OF HEART FAILURE: VARIATIONS BY SEX AND AGE

Laigy George*

ABSTRACT

Poor prognosis in heart failure (HF) patients with diabetes is often attributed to increased comorbidity and advanced disease. Further, this effect may be worse in women. To determine whether the effect of diabetes on outcomes and the sex-related variation persisted in a propensity score-matched HF population, and whether the sex-related variation was a function of age. Of the 7788 HF patients in the Digitalis Investigation Group trial, 2218 had a history of diabetes. Propensity score for diabetes was calculated for each patient using a non-parsimonious logistic regression model incorporating all measured baseline covariates, and was used to match 2056 (93%) diabetic patients with 2056 non-diabetic patients. Allcause mortality occurred in 135 (25%) and 216 (39%) women without and with diabetes (adjusted HR = 1.67; 95% CI = 1.34 to 2.08; p,0.001). Among men, 535 (36%) and 609 (41%) patients without and with diabetes died from all causes (adjusted HR = 1.21; 95% CI = 1.07 to 1.36; p = 0.002). Sex– diabetes interaction (overall adjusted p,0.001) was only significant in patients >65 years (15% absolute risk increase in women; multivariable p for interaction = 0.005), but not in younger patients (2% increase in women; p for interaction = 0.173). Risk-adjusted HR (95% CI) for all-cause hospitalisation for women and men were 1.49 (1.28 to 1.72) and 1.21 (1.11 to 1.32), respectively, also with significant sex–diabetes interaction (p = 0.011). Diabetes-associated increases in morbidity and mortality in chronic HF were more pronounced in women, and theses sex-related differences in outcomes were primarily observed in elderly patients.

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