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Surrogate estimates of insulin sensitivity in subjects with hypertension

Abstract

The purpose of the study is to compare surrogate estimates of insulin sensitivity with a directly measured insulin sensitivity index, steady-state plasma glucose (SSPG) from insulin suppression test (IST), in subjects with hypertension. Two hundred and twenty-eight hypertensive patients who received IST for SSPG were included for analysis. Estimates from fasting measurements alone, homeostasis model assessment for insulin resistance (HOMA-IR) and quantitative insulin sensitivity check index (QUICKI)), and indices from fasting and/or 2 h samples (ISI0,120 and ISITX) were calculated. In addition to Pearson and partial correlations, variance-component models were used to test the relationship between surrogate estimates of insulin sensitivity and SSPG. A large proportion of variance owing to covariates in the variance-component models indicated the goodness of model fit, irrespective of the independence among variables. SSPG was positively correlated with logarithmic transformation (Log) (HOMA-IR) and negatively correlated with QUICKI, Log (ISI0,120) and ISITX (all P<0.0001). Log (ISI0,120) seemed to have a better correlation with SSPG (r=−0.72) than other measures in partial correlation. The proportion of variance owing to all covariates of Log (ISI0,120) and ISITX were larger than those of Log (HOMA-IR) and QUICKI in the variance-component models. After adjustments for demographic and obesity covariates, the proportion of variance explained by Log (ISI0,120) were largest among the surrogate measures in the variance-component models. Our results showed that ISI0,120 and ISITX correlated better with SSPG than those used fasting measures alone (HOMA-IR and QUICKI). Log (ISI0,120) currently showing the strongest association with SSPG than other estimates is adaptable for use in large studies of hypertension.

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Acknowledgements

The study was supported by grants from the National Science Council ROC (NSC85-2331-B075-109Y, NSC86-2314-B075-099, NSC87-2312-B075-003Y), the National Health Research Institute ROC (DD01-86IX-MG-608S) and the National Heart, Lung and Blood Institute (U01HL54527-0151). Dr Chii-Min Hwu was also supported by the Taipei Veterans General Hospital (VGH-91-15A) and the Shih-Yuan Foundation for the Development of Internal Medicine (Grant No. 93008).

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Hwu, C., Hsiao, C., Grove, J. et al. Surrogate estimates of insulin sensitivity in subjects with hypertension. J Hum Hypertens 21, 246–252 (2007). https://doi.org/10.1038/sj.jhh.1002137

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