Fructosamine and Triglycerides - Developing an Index for Assessing Insulin Resistance

IntroductionInsulin resistance (IR) is a metabolic condition where cells become less responsive to insulin, affecting glucose absorption and leading to diseases like type 2 diabetes. Factors like obesity and high triglycerides worsen IR. Fructosamine is a key marker for short-term glycemic control and can indicate IR. Various methods, like the euglycemic clamp and HOMA-IR index, assess IR, with the TyG index emerging as a simple and reliable tool due to its strong correlation with IR. ObjectiveTo develop and evaluate a novel IR index that incorporates both fructosamine and triglyceride levels, aiming to improve the accuracy of IR assessment compared to existing methods. MethodsThis study investigated IR using established methods and proposed a novel TrigFruc index incorporating fructosamine. Data from 200 individuals was analyzed to assess the TrigFruc indexs performance compared to existing methods (HOMA-IR and TyG index). Descriptive statistics summarized participant demographics, and Pearsons correlation evaluated the relationship between TrigFruc and HOMA-IR and between TrigFruc and TyG index. A receiver operating characteristic (ROC) analysis identified the optimal TrigFruc cut-off point for IR detection, comparing its sensitivity and specificity to HOMA-IR and TyG index. ResultsStudy with 200 participants (63% female, avg. age 46.6 years), the established HOMA-IR index identified IR in 32% (64 individuals) while the TyG index found it in 66% (132). The new TrigFruc index showed a weaker correlation with HOMA-IR (r=0.28) compared to the TyG index (r=0.44). For detecting IR based on HOMA-IR, the optimal TrigFruc cut-off (Ln 4.57) had just 50% sensitivity (correctly identifying half of true IR cases) but low specificity (23%, high misclassification of non-IR cases). When compared to the TyG index, the optimal TrigFruc cut-off (Ln 4.74) showed excellent performance with high sensitivity (85%, strong ability to identify true IR) and specificity (95%, low misclassification of non-IR). ConclusionThe TrigFruc index, incorporating fructosamine, shows promise for IR assessment. Compared to HOMA-IR, it exhibits better correlation with the TyG index and superior sensitivity and specificity for IR detection when using the TyG index as a reference.