An elevated apolipoprotein B/AI ratio is independently associated with microalbuminuria in male subjects with impaired fasting glucose

Avaliação dos níveis de albuminúria em adultos obesos e sua associação com marcadores de risco cardiovascular

Introdução: A obesidade é um dos fatores mais importantes para explicar o aumento incidência das Doenças Cardiovasculares (DCV). Dentre os múltiplos fatores de risco para estas doenças, a albuminúria é dos mais importantes.  Objetivos: Avaliar os níveis de albuminúria e correlacionar com outros marcadores de risco cardiovascular em pacientes obesos que procuraram tratamento para obesidade. Materiais e métodos: Estudo transversal, retrospectivo, através dos prontuários de 183 pacientes de ambos os sexos, entre 18 e 65 anos, com índice de massa corpórea (IMC) ≥ 30 Kg/m². Todos os pacientes foram submetidos a exame físico e receberam um pedido de rotina laboratorial, incluindo de albuminúria em amostra isolada de urina. Resultados: Dados de albuminúria estavam disponíveis em 81 prontuários. Destes, 15 pacientes (18,5%) tinham valores acima de 17 mg/L de albuminúria. Nenhuma correlação foi encontrada entre os níveis de albuminúria e os parâmetros antropométricos (IMC, r=0,08; p=0,47; Cintura, r=0,17; p=0.11; Quadril, r=0,11; p=0,35; RCQ, r=0,03; p=0,75), Pressão Arterial (PA) sistólica (r=0,013; p=0,21) ou diastólica (r=0,11; p=0,32). Nenhuma diferença foi encontrada entre os pacientes que já usavam anti-hipertensivos ou não (p=0,25). Foi encontrada correlação entre os níveis de albuminúria e o high-density lipoprotein cholesterol (HDLc), (r=-0,27; p=0,012), além de uma tendência a significância com os níveis de Proteína C Reativa Ultrassensível (PCR-us; r=0,21; p= 0,081). Conclusão: Apesar da alta frequência (18,5%) de albuminúria em pacientes obesos, não foi encontrada correlação entre este marcador e os parâmetros antropométricos. Foi encontrado uma relação inversa da albuminúria com HDLc e uma tendência a significância com a PCR-us, sugerindo uma associação limitada entre a albuminúria e alguns marcadores específicos de risco cardiovascular.

Is the ratio of apoB/apoA-1 the best predictor for the severity of coronary artery lesions in Chinese diabetics with stable angina pectoris? An assessment based on Gensini scores

Background

There is a paucity of data about the best lipid ratio predicting the severity of coronary artery disease (CAD) in patients with diabetes mellitus. We determined the relationship between five conventional lipid ratios and the extent of coronary artery lesions in Chinese Type 2 diabetics with stable angina pectoris (SAP).

Methods

A prospective cohort study within 373 type 2 diabetic patients diagnosed with stable CAD by coronary angiography was performed. All patients were classified into three groups according to the tertiles of Gensini scores (GS, low group < 8 points n = 143; intermediate group 8–28 points, n = 109; high group > 28 points, n = 121). Association between the ratios of apolipoprotein (apo) B and apoA-1, total cholesterol and high density lipoprotein cholesterol (TC/HDL-C), triglycerides and HDL-C (TG/HDL-C), low density lipoprotein cholesterol and HDL-C (LDL-C/HDL-C), Non-HDL-C/HDL-C and GS were evaluated using the receivers operating characteristic (ROC) curves and multivariate logistic regression models.

Results

The ratio of apoB/apoA-1, TC/HDL-C, LDL-C/HDL-C, and Non-HDL-C/HDL-C were correlated with Gensini scores. Area under the ROC curves for predicting high Gensini scores in the ratios of apoB/apoA-1, TC/HDL-C, LDL-C/HDL-C and Non-HDL-C/HDL-C were 0.62, 0.60, 0.59 and 0.60, respectively (P < 0.005 for all). According to multivariate logistic regression analysis after adjusted with demographic characteristic and other lipid parameters, the ratio of apoB/apoA-1 is qualified as an independent discriminator for the severity of CAD. However, after further adjusting different baseline variables, such as left ventricular ejective fraction, hemoglobin A1c, leukocytes count and serum creatinine, none of the above lipid ratios remained.

Conclusions

Compared with other lipid parameters, the ratio of apoB/apoA-1 appears to be more significantly correlated with the extent of coronary artery lesions in Chinese diabetics, but it was not an independent predictor in these settings.

Apolipoprotein B attenuates albuminuria-associated cardiovascular disease in prevention of renal and vascular endstage disease (PREVEND) participants

Whether urinary albumin excretion relates to higher levels of atherogenic apolipoprotein B fractions in the nondiabetic population is uncertain. Such a relationship could explain, in part, the association of elevated urinary albumin excretion with cardiovascular disease risk. We assessed the relationship of urinary albumin excretion with apolipoprotein B fractions and determined whether the association of elevated urinary albumin excretion with incident cardiovascular events is modified by high apolipoprotein B fraction levels. We performed a prospective study on 8286 nondiabetic participants (580 participants with cardiovascular disease; 4.9 years median follow-up time) with fasting lipids, apolipoprotein B, and urinary albumin excretion determined at baseline. With adjustment for sex and age, micro- and macroalbuminuria were associated with increased apolipoprotein B fractions (non-HDL cholesterol, LDL cholesterol, triglycerides, and apolipoprotein B). All four apolipoprotein B fractions modified associations of urinary albumin excretion with incident cardiovascular disease (hazard ratios for interaction terms ranged from 0.89 to 0.94 with 95% confidence intervals ranging from 0.84 to 0.99 and P values ranging from 0.001 to 0.02 by Cox proportional hazards modeling). These interactions remained present after additional adjustment for conventional risk factors, eGFR, cardiovascular history, and lipid-lowering and antihypertensive drug treatments. Such modification was also observed when urinary albumin excretion was stratified into normo-, micro-, and macroalbuminuria. We conclude that there is an association between elevated urinary albumin excretion and apolipoprotein B fraction levels and a negative interaction between these variables in their associations with incident cardiovascular events. Elevated urinary albumin excretion may share common causal pathways with high apolipoprotein B fractions in the pathogenesis of cardiovascular disease.