Abstract
Antihypertensive agents differentially influence the plasma adiponectin concentration and the effects of fixed-dose combination regimens remain unclear. The influence of a combination of an angiotensin-converting enzyme inhibitor (ACEI) and a thiazide-type diuretic or an ACEI alone on plasma adiponectin concentrations in patients with essential hypertension was evaluated in the present study. After a 2-week placebo run-in phase, 30 patients with essential hypertension were randomized to receive preterax (2 mg perindopril/0.625 mg indapamide) or cilazapril (2.5 mg) once daily for 12 weeks. Plasma adiponectin and insulin concentrations were measured before and after treatment. Insulin resistance was measured by homeostasis assessment index (HOMA-IR). Treatment with preterax (P=0.003) and cilazapril (P=0.031) significantly reduced systolic blood pressure (BP), but only preterax reduced diastolic BP (P=0.024). Cilazapril treatment significantly increased the plasma adiponectin concentration (P=0.025) and reduced plasma triglycerides (P=0.041), whereas preterax treatment increased the plasma insulin concentration (P=0.041) and tended to increase HOMA-IR. The combination of an ACEI and indapamide improved BP control, but attenuated the beneficial effects of ACE inhibition on plasma adiponectin in patients with essential hypertension. Such a combination may be best reserved for improved BP control rather than for metabolic protection in clinical hypertension.
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