Research methods
systemic disease, fracture, anemia, diabetes, cerebrovascular disease, femoral neck fracture, intertrochanteric fracture
SYSTEMIC DISEASE, DYSFUNCTION, ANEMIA, HYPERTENSION, COMPLICATIONS
Two researchers collected 34 variables from demographic variables, operation-related variables, and laboratory parameters. Demographic variables included the gender of the patients, age, body mass index (BMI), fracture site (intertrochanteric fracture or femoral neck fracture), injury mechanism (low-energy or high-energy), the time from injury to admission, number of complications, comorbidities (anemia, hypertension, diabetes, cerebrovascular disease, etc.). Operation-related variables included the American Society of Anesthesiologists (ASA) classification, anaesthesia type, operation time, etc. Laboratory parameters included hemoglobin (HB), serum potassium concentrations, BNP, cTn I, etc. BMI was calculated by dividing the weight by height squared. According to the patient’s physical condition and the risk of surgery, the ASA classification divides patients into grades 1–5 (grade I: patients could tolerate the procedure well; grade II: patients had the mild systemic disease but no dysfunction; grade III: The patient had the severe systemic disease and certain dysfunction; grade IV: patients had the severe systemic disease and high anesthesia risk; grade V: dying patients).To guarantee the homogeneity of the research objects, the researchers strictly implemented the inclusion and exclusion criteria. After two researchers inputted data, all data were cross-checked by a consultant researcher, also a researcher of this study. For suspicious or inconsistent data, the researchers corrected it by again referring to the medical records.