Abstract:Objective To observe the features and cause of thyroid hormones changes in acute myocardial infarction(AMI) patients, and evaluate their value in the short-term prognosis the patients. Methods Totally 172 patients diagnosed as AMI patients without previows thyroid disorder in our hospital from October 2010 to October 2012 were enrolled, and 92 unstable angina pectoris patients were included as control group. The levels of free tri-iodothyronine (FT3), free tetra-iodothyronine (FT4), thyroid stimulating hormone (TSH), high sensitivity C-reactive protein (hs-CRP) and blood lipids were determined in all patients on the next day of admission. Cardiovascular mortality events of these patients in hospital were also recorded. Results Serum FT3, FT4 and TSH in the AMI group were (2.33±0.47)ng/L, (12.5±2.4)ng/L and (1.32±0.99)μU/L, respectively. While in the angina group, serum FT3, FT4 and TSH were (2.80±0.54)ng/L, (11.5±1.4)ng/L and (2.19±1.07)μU/L, respectively. The levels of FT3 and TSH were significantly lower in the AMI group than in the angina group (P<0.05). No significant difference was observed in the level of FT4 between the two groups (P>0.05). The levels of total cholesterol (TC), low density lipoprotein cholesterol (LDL-C) and hs-CRP were obviously higher in the AMI group than in the angina group (P<0.05, P<0.01). There was a linear correlation of FT3 with age, TC, and hs-CRP in the AMI group. When receiver operating characteristics (ROC) analysis was used to evaluate the prognostic value of FT3 for cardiovascular mortality events in the AMI group during hospitalization, the area under the ROC curve was 0.852, suggesting well prognosis value of FT3. There was no significant difference no matter in lipids and thyroid hormone levels in the AMI group between those with and without ST elevation (P>0.05). Conclusion AMI patients have decreased levels of FT3 and TSH. Serum change of FT3 is a predictor for in-hospital cardiovascular mortality events.