Insulin resistance and inflammatory activation in older patients with systolic and diastolic heart failure

Abstract

Objective: To evaluate insulin resistance and systemic inflammation in older patients with systolic (SHF) or diastolic heart failure (DHF). Patients: 52 non-diabetic patients (> 70 and < 90 years old) with chronic heart failure (CHF) and hospitalised within the previous six months for heart failure were studied, together with a control group of older healthy volunteers (n = 26). On the basis of Doppler echocardiographic criteria patients were classed as having SHF (n = 27) or DHF (n = 25). Main outcome measures: Fasting glucose, insulin, C reactive protein, interleukin 6, and tumour necrosis factor a soluble receptor II (TNF-αSRII) concentrations were determined. Insulin resistance was estimated by the homeostasis model assessment (HOMA). Results: HOMA index (median, interquartile range) was higher in patients with DHF (1.77, 1.06-2.20) than in patients with SHF (0.97, 0.81-1.85) or healthy volunteers (1.04, 0.76-1.44; p = 0.01). After adjustment for body mass index, age, and use of angiotensin converting enzyme inhibitors, both groups of patients with CHF were more insulin resistant than were healthy volunteers (p = 0.02). C reactive protein, interleukin 6, and TNF-αSRII were all significantly (p < 0.001) higher in patients with DHF and SHF than in healthy volunteers. All markers of systemic inflammation were independently associated with the presence of clinical CHF. Conclusion: Insulin resistance and inflammatory activation are present in older patients with SHF and DHF.