Post-operative pulmonary complications in total knee arthroplasty: Incidence, risk factors, and impact on patient outcomes
Post-operative pulmonary complications (PPCs) after total knee arthroplasty (TKA) are a significant cause of morbidity and mortality, prolonging hospital stays and increasing healthcare costs. Identifying risk factors for PPCs is crucial for developing targeted preventive strategies. This study aimed to systematically analyze the incidence of PPCs and their impact on patient outcomes following TKA, with a focus on identifying specific risk factors associated with PPCs. Utilizing the National Inpatient Sample (NIS) database, we identified 550,168 TKA cases between 2016 and 2019. PPCs were defined based on International Classification of Diseases, 10th Revision, Clinical Modification codes, including pneumonia, pulmonary embolism (PE), and acute respiratory failure. We evaluated patient demographics, payer type, hospital costs, perioperative complications, and length of stay. Multivariate logistic regression analysis was performed to identify relevant independent risk factors; the overall incidence of PPCs was 0.78%, with pneumonia at 0.21%, acute respiratory failure at 0.44%, and PE at 0.22%. Patients with PPCs were older (median age 70 years vs. 67 years) and had a higher proportion of comorbidities. Key risk factors identified included older age (odds ratio [OR] = 1.21), female gender (OR = 1.10), chronic pulmonary disease (OR = 1.47), coagulopathy (OR = 1.67), and post-operative complications such as deep vein thrombosis (OR = 9.41) and acute renal failure (OR = 8.07). PPCs were linked to a notably extended median duration of hospitalization (5 days compared to 2 days), elevated median healthcare costs ($81,829 compared to $53,542), and a higher mortality rate (2.5% compared to 0.0%). PPCs following TKA impose significant financial and healthcare challenges. These results underscore the critical role of thorough pre-operative risk evaluation and effective post-operative care in mitigating the occurrence of PPCs. This research offers evidence-based guidance to support clinical decision-making and enhance patient outcomes after TKA.
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