糖尿病酮症酸中毒患儿氧化应激状况及影响因素分析

目的 探讨糖尿病酮症酸中毒(DKA)患儿血清氧化应激指标的变化及其与代谢参数的相关性.方法 将受试者分为4组:即DKA组22例;血糖控制一般组18例,糖化血红蛋白(HbAlc)＜9%;血糖控制较差组(HbAlc≥9%)22例;健康对照组36例.检测其血清丙二醛(MDA)、一氧化氮(NO)、谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)水平,并常规检测空腹血糖、血气、血清离子(K+,Na+,Cl-,P)、肾功能、尿常规、HbAlc.结果 DKA组血清MDA水平显著高于健康对照组(P＜0.01)及血糖控制一般组(P＜0.01),但与血糖控制较差组差异无显著性(P＞0.05);3组糖尿病患儿血清NO水平均显著高于健康对照组(P＜0.01),且血糖控制较差组NO显著高于血糖控制一般组(P＜0.01);3组糖尿病患儿血清GSH-Px水平均显著低于健康对照组(P＜0.01);4组间SOD水平差异无显著性(P＞0.05).相关分析显示糖尿病患儿血清MDA水平与HbAlc呈极显著正相关(r=0.375,P＜0.01),NO与HbAlc呈显著正相关(r=0.250,P＜0.05),DKA患儿血清SOD水平与HbAlc呈显著负相关(r=-0.507,P＜0.05),其他氧化应激指标与代谢参数问无相关性.结论 DKA患儿氧化应激产物显著增加,抗氧化能力降低,这些改变主要应归因于慢性高血糖而不是急性代谢紊乱.

Oxidative stress state in children with diabetic ketoacidosis and its influencing factors

Objective To investigate the oxidative stress state in children with diabetic ketoacidosis (DKA),and analyze whether any observed abnormalities were related to metabolic disturbances.Methods Four groups of subjects were studied,comprising with 22 patients with DKA(group 1),18 diabetic children with medium metabolic control,whose glycated hemoglobin(HbAlc) below 9%(group 2),22 children with poorly controlled diabetes,whose Hbal c above 9%(group 3),and 36 healthy control children(group 4).Malondialdehyde(MDA),nitrate oxidase(NO),glutathione peroxidase(GSH-Px),superoxide dismutase(SOD),and metabolic parameters such as fasting blood glucose,HbAlc,blood gas analysis,serum ion,renal function of the subjects were measured.Results Mean serum MDA value was significantly higher in group 1 than in group 2(P ＜0.01) and group 4(P ＜0.01),but was not different from that in group 3 (P ＞0.05).Serum levels of NO were significantly higher in group 1,2 and 3 compared with group 4(P＜0.01).Serum levels of GSH-Px were significantly lower in group 1,2 and 3 than in group 4(P＜0.01).There were no significant differences of serum SOD value among the four groups(P＞0.05).Both serum MDA and NO values in the diabetic patients(groups 1 +2 +3) were positively related to HbAlc(r=0.375,P ＜0.01;r=0.250,P ＜0.05),and serum SOD values in the DKA patients were negatively related to HbAlc(r= -0.507,P＜0.05),there were not any significant relationship between the other oxidative markers and metabolic parameters.Conclusion There is an increase of oxidative stress and decrease of antioxygenic ability in DKA children,and these changes tend to correlate more with markers of diabetic imbalance than with parameters of acute metabolic disturbances of DKA.