外科感染病人胰岛素抵抗的临床意义

目的研究外科脓毒症病人胰岛素抵抗的临床意义。方法40例外科脓毒症病人入实验组,20例同期相似APACHEⅡ评分但无脓毒症的外科病人入实验对照组。实验组再分别根据病情严重度分为sepsis组和septicshock＆MODS（SM）组,根据原发病分为SAP组、肠瘘组和其他组。检测病人入组后不同时间点的空腹血糖、空腹胰岛素、临床代谢指标和血浆TNF-α浓度,并评价APACHEⅡ、SOFA和SS评分。胰岛素抵抗指数通过稳态模式评估法计算。结果脓毒症状态下胰岛素抵抗存在占84%,所有脓毒症病人lgHOMA-IR检测峰值均显著大于正常值。实验组lgHOMA-IR从24h（P〈0.01）到第7天（P〈0.01）均显著高于对照组。SAP组、肠瘘组和其他组之间lgHOMA-IR在各时间点无显著差异（P〉0.05）。SM组lgHOMA-IR在各时间点显著高于sepsis组,相关分析显示lgHOMA-IR与APACHEⅡ（r=0.591,P〈0.01）、SOFA（r=0.496,P〈0.01）、SS评分（r=0.553,P〈0.01）和血浆TNF-α（r=0.658,P〈0.01）呈显著正相关。lgHOMA-IR独立相关于LDL、前白蛋白、胆固醇和甘油三酯。R2为0.188。结论外科危重病人普遍存在胰岛素抵抗,与导致感染的原发病无关,可以作为代谢紊乱和病情严重度的预警指标。

The clinical significance of acute insulin resistance during surgical sepsis

Objective To investigate the clinical significance of acute insulin resistance during surgical sepsis. Methods Forty surgical patients with sepsis in experimental group and twenty patients with similar APACHEⅡ but without sepsis in experimental control group were enrolled in our study. In the experimental group, the patients were categorized to sepsis group and septic shock and MODS(SM)group according to clinical manifestations, and were also grouped according to different causes of sepsis, i.e.severe acute pancreatitis(SAP)group, intestinal fistula group and other diseases group. Determinations of fasting blood glucose, fasting plasma insulin, clinical nutritional parameters, plasma TNF-α, APACHEⅡ, sepsis-related organ failure assessment(SOFA)and severe scores were simultaneously performed at designated time points. Insulin resistance index was calculated using homeostasis model assessment(HOMA)to assess insulin sensitivity of surgical patients with sepsis. Results (1)A significant elevation of lgHOMA-IR levels was found in 84% of tests in sepsis. Peak lgHOMA-IR values increased in all patients.(2)LgHOMA-IR was significantly higher in patients with sepsis than those without sepsis from the first 24 hours(1.22±0.23 vs 0.73±0.21, P＜0.01)to the 7th day(0.46±0.32 vs 0.30±0.13, P＜0.01).(3)There was no significant difference in lgHOMA-IR among SAP, intestinal fistula and other groups at different times(P＞0.05).(4)There was significant difference in lgHOMA-IR between sepsis group and SM group during the whole septic episode(P＜0.01).During the septic episode, there were significant correlation between lgHOMA-IR and APACHEⅡ(r=0.591, P＜0.01), lgHOMA-IR and SOFA(r=0.496, P＜0.01), lgHOMA-IR and SS(r=0.553, P＜0.01), and lgHOMA-IR and TNF-α(r=0.658, P＜0.01).(5)lgHOMA-IR was independently directly correlated with LDL, prealbumin, cholesterol and triglyceride. R2 of the equation was 0.188. Conclusion There usually is insulin resistance in surgical sepsis, regardless the primary diseases. Insulin resistance may simply be a marker reflecting an underlying physiological derangement, implying indicates higher mortality. Among several clinical nutrition parameters, LDL, prealbumin, cholesterol, and triglyceride showed closer relationship with insulin resistance in patients with sepsis.