Study population and data extraction
comorbidity, TG, Comorbidity
AMI, DISEASES
Adult patients with the diagnosis of insertion of coronary artery stents based on the International Classification of Diseases (ICD)-9 code were selected (ICD-9 codes were 3606 and 3607). We excluded patients who were younger than 18 years old. If a patient had information from more than one admission, we only considered the first ICU information.We used Structured Query Language and PostgreSQL software (version 10.0) to obtain data from MIMIC III. These data included demographic characteristics (including age and sex), SOFA score, Elixhauser Comorbidity Index, SAPS II score, body mass index (BMI), mean value of vital signs during the first 24 hours of ICU stay (including heart rate, systolic pressure, diastolic pressure, and respiration rate), treatment (ventilation treatment type and the use of vasoactive drugs), laboratory results (including hemoglobin, platelets, sodium, potassium, PT, WBC, CKMB, anion gap, bicarbonate, chloride, troponin T (TnT), troponin I (TnI), low-density lipoprotein (LDL), triglyceride (TG), and lactate (Lac)), the type of coronary artery stent (drug eluting stent or non-drug eluting stent), with or without the diagnosis of AMI. We extracted vital signs and laboratory results within 24 hours after admission, and if patients had multiple results in the first 24 hours, we took their average.Elixhauser Comorbidity Index is a method of categorizing comorbidities of patients based on the ICD diagnosis codes found in administrative data, such as hospital abstracts data. Each comorbidity category is dichotomous (the comorbidity either present or it is not). The Index can be used to predict hospital resource use and in-hospital mortality [In our study, the endpoint was died in hospital. All variables with more than 20% missing values were deleted (including BMI, TnT, TnI, LDL, TG, and Lac). If the missing value of a continuous variable was less than 10%, the missing value was filled by multiple interpolation.