Chronic kidney disease and risk of postoperative cardiovascular events in elderly patients receiving hip fracture surgery

Risk factors and prognosis of postoperative acute myocardial infarction in elderly hip fracture patients combined with coronary heart disease

INTRODUCTION

This article mainly studies the risk factors for postoperative acute myocardial infarction (AMI) in elderly hip fracture patients combined with coronary heart disease (CHD), constructs a prediction model, and evaluates the prognosis of all the patients.

METHODS

This article retrospectively collected elderly patients with hip fracture and CHD who underwent hip fracture surgery at the Third Hospital of Hebei Medical University from January 2019 to December 2021. Demographic data, laboratory indicators, and imaging examination results were collected from the medical case system. The risk factors of postoperative AMI were determined by univariate and multivariate logistic regression, and a nomogram prediction model was established. The ROC curve, calibration curve and DCA decision curve were plotted by R language software. The patients in the training set were followed up for 2 years to evaluate their survival situation.

RESULTS

1094 eligible patients were divided into a training set (n = 824 from January 1, 2019 to September 31, 2021) and a validation set (n = 270 from October 1, 2021 to December 31, 2022). In the training set, women accounted for 58.6%; The average age of the patients was 79.45 years old; The main type of fracture was intertrochanteric fracture. There were 64.7% patients taken B receptor blockers; A total of 166 (20.1%) patients underwent percutaneous coronary intervention (PCI); Hypertension accounted for 55.5%; 520 (63.1%) patients had a preoperative waiting time greater than 3 days; The average hemoglobin value upon admission was 101.36 g/L; The average intraoperative bleeding volume was 212.42 ml; The average surgical time was 2.5 ± 0.3 h; Reginal anesthesia accounted for 29.7%; 63 (68.5%) AMI patients had no obvious clinical symptoms; 68 (73.9%) AMI patients did not show ST-segment elevation in ECG; The risk factors of postoperative AMI were age, hemoglobin at admission, diabetes, chronic kidney disease, intraoperative bleeding, and reginal anesthesia. The AUC of the nomogram prediction model was 0.729. The AUC in the validation set was 0.783. Survival analysis showed a significant statistical difference in 2-year mortality between patients with AMI and without AMI, among all the patients with AMI, patients with ECG ST-segment elevation has higher mortality than patients without ECG ST-segment elevation.

CONCLUSION

Our research results found that the incidence of postoperative AMI in elderly patients with hip fractures and CHD was 11.1%. Age, diabetes, hemoglobin at admission, regional anesthesia, chronic kidney disease, and intraoperative bleeding are risk factors. The AUC of the nomogram in training set is 0.729. The 2-year mortality rate of the patients with AMI is higher than that of patients without AMI.

Development and Internal Validation of a Nomogram for Predicting Postoperative Cardiac Events in Elderly Hip Fracture Patients

Purpose

Postoperative cardiac events (PCEs) are among the main adverse events after hip fracture surgery in the elderly. Existing cardiac risk assessment tools have some limitations and are not specifically designed for elderly patients undergoing hip fracture surgery. This study aimed to develop and internally validate a nomogram for prediction of PCEs in these patients.

Patients and Methods

We performed a retrospective study of 992 patients aged ≥65 years undergoing hip fracture surgery in our hospital from July 2015 to December 2021. Patients' demographics and clinical data were collected. Least Absolute Shrinkage and Selection Operator (LASSO) regression was used to select predictors, and multivariate logistic regression was employed to construct a nomogram. Internal validation was performed by bootstrapping. The discriminatory ability of the model was determined by the area under the receiver operating characteristic curve (AUC). The calibration and clinical utility of the model were assessed. The predictive power and clinical benefit of the nomogram were compared with the Revised Cardiac Risk Index (RCRI).

Results

The nomogram was constructed including seven variables: general anesthesia, the American Society of Anesthesiologists (ASA) classification, history of heart failure, history of severe arrhythmia, history of coronary artery disease, preoperative platelet count, and serum creatinine. The nomogram had an excellent predictive ability (AUC = 0.875, 95% confidence interval [CI]: 0.828-0.918). Satisfactory calibration was shown by calibration plots and the Hosmer-Lemeshow goodness-of-fit test (P = 0.520). Clinical usefulness was confirmed by decision curve analysis and clinical impact curve. The predictive power and clinical utility of the nomogram were superior to RCRI.

Conclusion

We developed an easy-to-use nomogram for prediction of PCEs in elderly hip fracture patients. This prediction model could effectively identify patients at high risk of PCEs and may be useful for perioperative management optimization.

Preoperative Anemia and Risk of In-hospital Postoperative Complications in Patients with Hip Fracture

Purpose

To evaluate the impact of preoperative anemia on postoperative complications after hip fracture surgery.

Patients and Methods

We conducted a retrospective study including hip fracture patients at a teaching hospital between 2005 and 2022. We defined preoperative anemia as the last hemoglobin measurement level before surgery < 130 g/L for men and < 120 g/L for women. The primary outcome was a composite of in-hospital major complications, including pneumonia, respiratory failure, gastrointestinal bleeding, urinary tract infection, incision infection, deep venous thrombosis, pulmonary embolism, angina pectoris, arrhythmia, myocardial infarction, heart failure, stroke, and death. Secondary outcomes were cardiovascular events, infection, pneumonia, and death. We used multivariate negative binomial or logistic regression to evaluate the impact of anemia and its severity, categorized as mild (90-130 g/L for men, 90-120 g/L for women) or moderate-to-severe (< 90 g/L for both) anemia on outcomes.

Results

Of the 3540 included patients, 1960 had preoperative anemia. 188 anemic patients experienced 324 major complications, while 63 non-anemic patients had 94 major complications. The risk of major complications was 165.3 (95% CI, 149.5-182.4) and 59.5 (95% CI, 48.9-72.3) per 1000 persons in anemic and non-anemic patients, respectively. Anemic patients were more likely to have major complications than non-anemic patients (adjusted incidence rate ratio (aIRR), 1.87; 95% CI, 1.30-2.72), which was consistent in mild (aIRR, 1.77; 95% CI, 1.22-2.59) and moderate-to-severe (aIRR, 2.97; 95% CI, 1.65-5.38) anemia. Preoperative anemia also increased the risk of cardiovascular events (aIRR, 1.96; 95% CI, 1.29-3.01), infection (aIRR, 1.68; 95% CI, 1.01-2.86), pneumonia (adjusted odds ratio (aOR), 1.91; 95% CI, 1.06-3.57), and death (aOR, 3.17; 95% CI, 1.06-11.89).

Conclusion

Our findings suggest that even mild preoperative anemia is associated with major postoperative complications in hip fracture patients. This finding highlights considering preoperative anemia as a risk factor in surgical decision-making for high-risk patients.

Clinical Effectiveness of Home-Based Telerehabilitation Program for Geriatric Hip Fracture Following Total Hip Replacement

OBJECTIVE

To compare the effectiveness of a six-month home-based telerehabilitation based on the Internet-based rehabilitation management system coupled with conventional outpatient care in elderly patients with hip fractures following total hip replacement (THR).

METHODS

Elderly patients (aged over 65 years) with first hip fractures who underwent THR between March 2018 and September 2018 in Tianjin Hospital were enrolled in this study. Patients were divided into two groups: telerehabilitation group (n = 43) and telephone group (n = 42). A Internet-based telerehabilitation management system was established and applied on patients in the telerehabilitation group. For patients in the telephone group, the rehabilitation intervention was administered through conventional outpatient care (telephone along with outpatient follow-up). Data from the Harris hip scale (HHS), functional independence measure (FIM), self-rating anxiety scale (SAS), and postoperative complications at 1, 3, and 6 months after surgery were collected and compared between the two groups.

RESULTS

A total of 85 elderly patients completed the 6-month follow-up assessment. Results showed that the HHS score was significantly higher in the telerehabilitation group than in the telephone group at 1 month (66.35 ± 4.63 vs 63.48 ± 4.49), 3 months (76.33 ± 4.52 vs 71.81 ± 3.84), and 6 months (84.23 ± 3.13 vs 77.29 ± 4.95) after surgery (P < 0.001). The FIM score was significantly higher in the telerehabilitation group than in the telephone group at 1 month (89.00 ± 5.63 vs 73.35 ± 8.70), 3 months (100.16 ± 4.56 vs 92.81 ± 5.17), and 6 months (111.70 ± 3.13 vs 98.64 ± 5.12) after surgery (P < 0.001). The SAS score was significantly lower in the telerehabilitation group than in the telephone group at 1 month (42.40 ± 3.07 vs 46.21 ± 3.53), 3 months (36.77 ± 2.26 vs 40.24 ± 1.66), and 6 months (29.26 ± 1.63 vs 33.81 ± 2.62) after surgery (P < 0.001). The overall complication rate was significantly lower in the telerehabilitation group than in the telephone group (14% vs 40.5%) (P < 0.05).

CONCLUSION

Internet-based rehabilitation management system can not only promote the physical rehabilitation of patients, but also play a positive role in psychological rehabilitation and the prevention of complications, which provides new ideas and methods for clinical rehabilitation.