ABSTRACT
Objective To study the correlation between fractional excretion of uric acid (FEUA) and blood uric acid,body mass index (BMI),blood pressure,blood glucose,blood lipid and other metabolic factors in patients with primary gout.Methods Sixty-two patients with primary gout (gout group) and 32 healthy people (control group) were selected in this study.Gout group was divided into uric acid excretion decreasing group (FEUA ＜ 7％,29 cases),mixed group (7％ ≤FEUA ≤ 12％,25 cases) and uric acid production increasing group (FEUA ＞ 12％,8 cases) according to the level of FEUA.The fasting blood glucose (FPG),2-hour postprandial blood glucose (2 h PBG),blood lipid,serum creatinine,blood uric acid,glycosylated hemoglobin were tested.24 hours urine was collected and urinary uric acid and urinary creatinine was measured,FEUA was calculated and analyzed.Results BMI,mean arterial pressure,blood uric acid,glycosylated hemoglobin,total cholesterol,2 h PBG in gout group was higher than that in control group,and high density lipoprotein cholesterol,FEUA was lower than that in control group,and there was significant difference (P ＜ 0.05).There was no significant difference in age,FPG,low density lipoprotein cholesterol,triacylglycerol between two groups (P＞ 0.05).There was no significant difference in age,blood uric acid,FPG,2 h PBG,glycosylated hemoglobin,total cholesterol,low density lipoprotein cholesterol,high density hpoprotein cholesterol among uric acid excretion decreasing group,mixed group and uric acid production increasing group (P ＞ 0.05),and there was significant difference in BMI,mean arterial pressure,triacylglycerol,FEUA among three groups(P＜ 0.05).FEUA was negatively correlated with blood uric acid in control group and gout group (r =-3.900,-0.476,P ＜0.05).FEUA was positively correlated with 24 h urinary uric acid in gout group (r =0.465,P =0.001),and nagatively correlated with triacylglycerol (r =-0.304,P ＜ 0.05).Pearson analysis showed that FEUA was negatively correlated with blood uric acid in uric acid excretion decreasing group (FEUA ＜ 7％) (r =-0.392,P ＜ 0.05),FEUA was positively correlated with blood uric acid in non uric acid excretion decreasing group (FEUA ≥7％)(r =0.437,P ＜ 0.05),but 24 h urinary uric acid was not correlated with blood uric acid(P ＞ 0.05).Multi-stepwise regression analysis showed that blood uric acid,glycosylated hemoglobin,FEUA was significantly correlated with the onset of the gout (P ＜ 0.05).Conclusions Besides blood uric acid level,there are significant changes in primary gout in blood pressure,serum glucose and lipid levels.FEUA could be used to estimate the ability of renal excrete the uric acid.Mean arterial pressure,glycosylated hemoglobin and FEUA are the risk factors for gout.