Russian Heart Failure Journal 2009year Effect of renin-angiotensin system blockers on left ventricular hypertrophy and biochemical markers of collagen balance in patients with hypertensive hypertrophy


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2009/

Effect of renin-angiotensin system blockers on left ventricular hypertrophy and biochemical markers of collagen balance in patients with hypertensive hypertrophy

Ovchinnikov A. G., Serbul V. M., Ageev F. T.

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Urgency. Left ventricular hypertrophy (LVH) is an important risk factor of cardiovascular complications in patients with AH; hypertrophy regression is associated with reduced risk of these complications and improved prognosis. Aim. Evaluating the effect of the ACEI enalapril, the angiotensin receptor antagonist (ARA) candesartan and their combination on LVH and levels of biochemical markers for collagen balance in patients with hypertensive LVH. Materials and methods. 66 patients with LVH were allocated to the ARA candesartan 8-16 mg/day treatment group (n=33) or the ACEI enalapril 10–20 mg/day treatment group (n=33). In case of effective intial hypotensive response to the therapy, the therapy was administered for 6 months. Otherwise the other study drug was added to the existing therapy with the renin-angiotensin system (RAS) antagonist 2 months after the onset of original treatment (candesartan 8-16 mg/day to enalapril and enalapril 10-20 mg/day to candesartan). Myocardial mass index (MMI, by two-dimentional echoCG) and blood levels of matrix metalloproteinase-1 (MMP-1) and tissue inhibitor of matrix metalloproteinases-1 (TIMP-1) were measured at baseline and at 6 months. Results. By the end of study, the decrease in LV MMI reached 13.9% (p<0.05 vs. baseline) in the group of effective candesartan therapy, while in the group of effective enalapril therapy, the decrease was only 1.5% (р<0.01 vs. effective candesartan therapy). In the group of failed hypotensive therapy, the decrease in LV MMI was minimal at 2 months (1.8%); however addition of the second RAS antagonist allowed subsequent achievement of a significant decrease in LV MMI (5.1%). Groups of effective initial therapy showed only a tendency to increase in MMP-1, while the group of combination therapy had a significant increase in MMP-1. Levels of TIMP-1 remained unchanged in all groups throughout the study. Therefore candesartan exerted a more pronounced effect on LVH than enalapril in patients with hypertensive LVH. When a RAS antagonist does not exert a sufficient hypotensive effect, addition of another RAS antagonist results in a significant decrease in LV MMI. Furthermore a significant antifibrotic effect is only possible in a combination treatment with two RAS antagonists.
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