Objective: Our purpose was to determine glucose tolerance in pregnant women with cystic fibrosis (CF) and to relate glucose tolerance to insulin sensitivity, hepatic glucose production, and protein turnover. Methods: ...Objective: Our purpose was to determine glucose tolerance in pregnant women with cystic fibrosis (CF) and to relate glucose tolerance to insulin sensitivity, hepatic glucose production, and protein turnover. Methods: We studied 8 CF women during pregnancy (CFPreg). Results were compared with those from 9 pregnant controls (PregCont) and 8 nonpregnant CF women (CFCont). The following metabolic studies were conducted: oral glucose tolerance test (OGTT), hyperinsulinemic euglycemic clamp, stable isotope infusion of [1- 13C]leucine and [6,6- 2H2]glucose for measurement of whole body protein turnover and hepatic glucose production (HGP), respectively. Indirect calorimetry was used to measure resting energy expenditure (REE), and food intake was measured by 3- day food journals. Fat-free mass was measured by total body potassium 40K scan. Results: All but one CFPreg developed diabetes by the end of the second trimester and had significantly lower insulin secretion and more insulin resistance than PregCont. Hepatic glucose production was significantly higher and suppression by insulin was less in CF subjects, and protein breakdown was significantly igher. Insulin resistance and HGP increased during pregnancy similarly in CFPreg and PregCont groups. Conclusion: Pregnancy in CF is associated with decreased nsulin sensitivity and high HGP, in addition to inherent decreased insulin secretion. Pregnancy in CF is also associated with increased protein turnover and less response to insulin’ s anticatabolic effect. These changes appear to predispose the pregnant CF women to early development of diabetes and poor weight gain.展开更多
目的:通过高胰岛素-正葡萄糖钳夹试验验证腰高比在评估胰岛素抵抗中的临床应用价值。方法:共纳入154例受试者,检测空腹血脂谱及其他重要生化指标。所有受试者均行高胰岛素-正葡萄糖钳夹试验,并计算葡萄糖代谢率、体重指数(body mass ind...目的:通过高胰岛素-正葡萄糖钳夹试验验证腰高比在评估胰岛素抵抗中的临床应用价值。方法:共纳入154例受试者,检测空腹血脂谱及其他重要生化指标。所有受试者均行高胰岛素-正葡萄糖钳夹试验,并计算葡萄糖代谢率、体重指数(body mass index,BMI)、腰围、腰臀比、腰高比及HOMA指数。比较各指数预测评估受试者胰岛素抵抗的能力。结果:相关分析结果显示,腰高比(r=-0.730,P<0.001)、腰臀比(r=-0.651,P<0.001)、BMI指数(r=-0.717,P<0.001)、腰围(r=-0.716,P<0.001)均与高胰岛素-正葡萄糖钳夹试验所得葡萄糖代谢率显著相关。以葡萄糖代谢率为标准绘制ROC曲线,不同指数曲线下面积为HOMA-IR(0.860)>腰高比(0.850)>BMI(0.846)>腰围(0.837)>腰臀比(0.749)。腰高比诊断胰岛素抵抗的最佳值为0.56,此值在ROC曲线中对应了最高的灵敏度(93.9%)和特异度(66.7%)。结论:腰高比与高胰岛素-正葡萄糖钳夹试验所得的葡萄糖代谢率有较好的相关性,相较于BMI、腰围、腰臀比等有较高的敏感度及特异度,是较好评估胰岛素抵抗的简易指数,可广泛应用于流行病学研究或大型临床试验。展开更多
文摘Objective: Our purpose was to determine glucose tolerance in pregnant women with cystic fibrosis (CF) and to relate glucose tolerance to insulin sensitivity, hepatic glucose production, and protein turnover. Methods: We studied 8 CF women during pregnancy (CFPreg). Results were compared with those from 9 pregnant controls (PregCont) and 8 nonpregnant CF women (CFCont). The following metabolic studies were conducted: oral glucose tolerance test (OGTT), hyperinsulinemic euglycemic clamp, stable isotope infusion of [1- 13C]leucine and [6,6- 2H2]glucose for measurement of whole body protein turnover and hepatic glucose production (HGP), respectively. Indirect calorimetry was used to measure resting energy expenditure (REE), and food intake was measured by 3- day food journals. Fat-free mass was measured by total body potassium 40K scan. Results: All but one CFPreg developed diabetes by the end of the second trimester and had significantly lower insulin secretion and more insulin resistance than PregCont. Hepatic glucose production was significantly higher and suppression by insulin was less in CF subjects, and protein breakdown was significantly igher. Insulin resistance and HGP increased during pregnancy similarly in CFPreg and PregCont groups. Conclusion: Pregnancy in CF is associated with decreased nsulin sensitivity and high HGP, in addition to inherent decreased insulin secretion. Pregnancy in CF is also associated with increased protein turnover and less response to insulin’ s anticatabolic effect. These changes appear to predispose the pregnant CF women to early development of diabetes and poor weight gain.
文摘目的:通过高胰岛素-正葡萄糖钳夹试验验证腰高比在评估胰岛素抵抗中的临床应用价值。方法:共纳入154例受试者,检测空腹血脂谱及其他重要生化指标。所有受试者均行高胰岛素-正葡萄糖钳夹试验,并计算葡萄糖代谢率、体重指数(body mass index,BMI)、腰围、腰臀比、腰高比及HOMA指数。比较各指数预测评估受试者胰岛素抵抗的能力。结果:相关分析结果显示,腰高比(r=-0.730,P<0.001)、腰臀比(r=-0.651,P<0.001)、BMI指数(r=-0.717,P<0.001)、腰围(r=-0.716,P<0.001)均与高胰岛素-正葡萄糖钳夹试验所得葡萄糖代谢率显著相关。以葡萄糖代谢率为标准绘制ROC曲线,不同指数曲线下面积为HOMA-IR(0.860)>腰高比(0.850)>BMI(0.846)>腰围(0.837)>腰臀比(0.749)。腰高比诊断胰岛素抵抗的最佳值为0.56,此值在ROC曲线中对应了最高的灵敏度(93.9%)和特异度(66.7%)。结论:腰高比与高胰岛素-正葡萄糖钳夹试验所得的葡萄糖代谢率有较好的相关性,相较于BMI、腰围、腰臀比等有较高的敏感度及特异度,是较好评估胰岛素抵抗的简易指数,可广泛应用于流行病学研究或大型临床试验。
