Um valor elevado de HDL é o principal fator protetor contra a doença coronária no idoso com doença fibrocalcificante valvular aórtica

Abstract

Resumo: Apesar de apresentarem elevadas prevalências de hipertensão (HT) e hipercolesterolemia – colesterol total (CT) > 190 mg/dl – a maioria dos doentes (dts) idosos internados para cirurgia valvular por doença fibrocalcificante valvular aórtica (DFCVA) não tem doença coronária significativa (DCS). Objetivo: Avaliação do perfil lipidémico (PL) de dts operados por DFCVA e sua correlação com os dados coronariográficos e o perfil de fatores de risco (FR) prévio. Material e métodos: Estudo observacional prospetivo, de coorte, de 264 dts com DFCVA, 126 homens (dts M) e 138 mulheres (dts F), com idade > 59 anos (idade média de 72), consecutivamente internados. PL: determinação (na admissão, em jejum) de CT, HDL, triglicéridos (TG), LDL e lipoproteína (a) (Lp(a)). Conforme a presença angiográfica (irregularidades, lesões moderadas ou graves) ou a ausência (coronárias normais) de DCS, os dts foram respetivamente divididos em 2 grupos (Gr): GrA (127 dts – 48% do total) e GrB (137 dts – 52%). FR clássicos (média): 3,5 nos dts M, 2,6 nos dts F. Resultados: 1) Com exceção do género masculino, diabetes e HDL, os restantes fatores (tabagismo, HT, CT, TG, LDL – tanto nos dts medicados com estatina como nos dts não medicados – e Lp(a)) não permitem discriminar os dts-GrA dos dts-GrB; LDL(mg/dl)- GrA 116 ± 40 versus GrB 123 ± 38, nos dts não medicados com estatina. 2) DCS: 64 dts M versus 26% dts F (p 59 years (mean 72), 126 men (48%) and 138 women (52%). According to the angiographic presence (irregularities, moderate or significant lesions) or absence (normal angiogram) of significant CAD respectively, patients were divided into two groups: A (n = 127, 48%) and B (n = 137, 52%). A mean of 3.5 classical risk factors were identified in men and 2.6 in women. LP (obtained on admission, in the fasting state) included total cholesterol (TC), HDL, triglycerides (TG), LDL, and lipoprotein(a). Results: With the exception of male gender, diabetes and HDL, the other factors studied – smoking, hypertension, TC, TG, LDL (in both statin-treated and non-statin-treated patients) and lipoprotein(a) – did not show significant differences between groups A and B; LDL was 116 ± 40 mg/dl in group A vs. 123 ± 38 mg/dl in group B, in non-statin-treated patients; significant CAD was identified in 64% of men vs. 26% of women (p < 0.001); 43% of group A had diabetes vs. 27% of group B (p < 0.01); HDL was 49 ± 14 mg/dl in group A vs. 59 ± 16 mg/dl in group B (p < 0.001); HDL in group A was 49 ± 14 mg/dl in men vs. 49 ± 13 mg/dl in women (NS) and 45 ± 13 mg/dl in diabetic patients vs. 52 ± 14 mg/dl in non-diabetics (p < 0.02); HDL in group B diabetic patients was 54 ± 17 mg/dl in men vs. 56 ± 18 mg/dl in women (NS), and HDL in group B non-diabetic patients was 55 ± 13 mg/dl in men vs. 63 ± 17 mg/dl in women (p < 0.02). Multivariate analysis showed that only low HDL and diabetes (in women) were independent risk factors for significant CAD. The effect of male gender as a risk factor appears to be exerted mainly through lower HDL levels. Conclusions: Elevated HDL is the main negative risk factor for significant CAD in elderly high-risk but mildly dyslipidemic CAVD patients. HDL does not appear to have any protective effect in the pathophysiology of CAVD. In terms of long-term intervention, primary prevention of significant CAD should in the future be hybrid, focusing mainly on improving HDL function, but also on lowering LDL. Palavras-chave: Colesterol-HDL, Doença coronária, Doença fibrocalcificante valvular aórtica, Estenose aórtica, Fatores de risco, Doentes idosos, Keywords: HDL cholesterol, Coronary artery disease, Calcific aortic valve disease, Aortic stenosis, Risk factors, Elderly patients