Abnormal glucose and lipid control in non-ischemic left ventricular dysfunction

Background: Cardiovascular risk factors are classically associated with coronary atherosclerosis. We sought to investigate whether risk factors are also associated with left ventricular (LV) dilatation, contractile impairment and reduced myocardial blood flow (MBF) in patients with non-ischemic LV dysfunction. Methods: We studied 81 patients (59 males, age 60 ± 9 years) with mild-to-severe LV dysfunction (mean ejection fraction 37%, range 19%-50%), no history of diabetes and normal coronary arteries. Absolute MBF was measured by positron emission tomography and 13N-ammonia at rest and after dipyridamole (0.56 mg/kg I.V. over 4 min). Results: Overt LV dysfunction (LV end-diastolic diameter >60 mm associated with LV ejection fraction <45%) was present in 42 patients (52%); severely depressed hyperemic MBF (<1.09 mL·min-1·g-1) was present in 41 patients (51%). Using multivariate logistic regression analysis, low high-density lipoprotein cholesterol (HDL-C, P <.036), newly diagnosed non-insulin-dependent diabetes or insulin-resistance (NIDD/IR, P <.019) and the use of diuretics (P =.001) were independently associated with overt LV dysfunction. Low HDL-C (P =.015) and NIDD/IR (P =.048) were also independently associated with severely depressed hyperemic MBF. Conclusions: Low HDL-C and NIDD/IR are associated with more severe LV impairment and reduced hyperemic MBF in non-ischemic LV dysfunction. © 2012 American Society of Nuclear Cardiology