Research Article: Association of the single point insulin sensitivity estimator index with functional outcomes and hemorrhagic transformation in patients with acute ischemic stroke
Abstract:
Insulin resistance is an important risk factor for adverse prognosis in acute ischemic stroke (AIS). The single point insulin sensitivity estimator (SPISE) index, a novel insulin resistance surrogate independent of fasting plasma glucose, offers a potential advantage for assessing insulin resistance in AIS due to its lower susceptibility to stress-induced hyperglycemia in the acute phase. However, its associations with functional outcomes and intracranial hemorrhagic transformation (HT) in AIS remain unclear.
This multicenter retrospective cohort study consecutively enrolled patients with AIS who received intravenous thrombolysis between January 2019 and December 2023. We calculated five insulin resistance surrogates (SPISE index, TyG index, TyG-BMI, TG/HDL-C ratio, and METS-IR) and employed multivariable logistic regression models to analyze their associations with an unfavorable 90-day functional outcome (modified Rankin Scale score 3–6) and post-thrombolysis HT. The predictive performance of each index was compared using the area under the receiver operating characteristic curve (AUC).
Among the 862 patients ultimately included, the levels of the SPISE index, TyG index, TyG-BMI, and METS-IR were all independently associated with the risk of unfavorable functional outcomes (all P < 0.05). Specifically, the SPISE index showed a linear inverse association with this risk [odds ratio (OR) 0.83, 95% confidence interval (CI) 0.74–0.92, P for nonlinearity = 0.83]. Regarding predictive performance, METS-IR showed the highest discriminatory ability (AUC = 0.580), followed by TyG-BMI (AUC = 0.576). The SPISE index (AUC = 0.557) and the TyG index (AUC = 0.555) demonstrated comparable performance. For HT, only the TG/HDL-C ratio was independently associated with an increased risk (OR 1.09, 95% CI 1.01–1.18), while no significant associations were observed for the other surrogate indices.
In patients with AIS receiving intravenous thrombolysis, several insulin resistance surrogates are independently associated with unfavorable functional outcomes. However, all surrogate indices showed limited standalone discrimination, indicating they are not suitable as individual prognostic tools in clinical practice.
Introduction:
Insulin resistance is an important risk factor for adverse prognosis in acute ischemic stroke (AIS). The single point insulin sensitivity estimator (SPISE) index, a novel insulin resistance surrogate independent of fasting plasma glucose, offers a potential advantage for assessing insulin resistance in AIS due to its lower susceptibility to stress-induced hyperglycemia in the acute phase. However, its associations with functional outcomes and intracranial hemorrhagic transformation (HT) in AIS remain unclear.
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