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Anatol J Cardiol. 2019 Feb;21(2):60-67. doi: 10.14744/AnatolJCardiol.2018.38228.

Low free triiodothyronine is associated with contrast-induced acute kidney injury and long-term outcome in elderly patients who underwent percutaneous coronary intervention.

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Department of Geriatric Medicine, Fujian Provincial Hospital, Fujian Key Laboratory of Geriatrics, Fujian Provincial Center for Geriatrics, Fujian Medical University; Fuzhou-China.



Low free triiodothyronine (fT3) is common in elderly patients with cardiovascular disease. The purpose of this study was to evaluate the relationship between low fT3 and contrast-induced acute kidney injury (CI-AKI), including the long-term outcomes, in elderly patients after a percutaneous coronary intervention (PCI).


A total of 350 patients aged ≥75 years who underwent PCI between January 2012 and December 2015 were consecutively enrolled. The perioperative thyroid function, including fT3, was measured before PCI. A low fT3 was defined as fT3<3.1 pmol/L with normal thyrotropin and free thyroxine. CI-AKI was defined as an absolute serum creatinine (SCr) increase ≥0.30 mg/dL or a relative increase in SCr ≥50% from the baseline value within 48 hours after contrast media exposure. A multivariate logistic regression analysis was applied to analyze whether low fT3 was an independent risk factor for CI-AKI. The Cox regression analysis was used to evaluate the relationship between low fT3 and long-term prognosis.


A total of 46 (13.1%) patients developed CI-AKI. The incidence of CI-AKI was significantly higher in the low fT3 group than in the normal group (26.5% vs. 9.9%, p<0.01). A multivariable logistic analysis demonstrated that a low fT3 level was significantly related to CI-AKI [odds ratio (OR)=2.41; 95% confidence interval (CI), 1.11-5.27; p=0.027]. The Cox regression analysis showed that a low fT3 was associated with long-term mortality [adjusted hazard ratio (HR)=2.00; 95% CI, 1.04-3.83; p=0.037] during the follow-up of mean 1.67 years.


A low fT3 concentration was independently associated with CI-AKI and poor prognosis in elderly patients who had undergone PCI.

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