Abstract
Objective
Post-operative bleeding after total knee arthroplasty (TKA) is a frequent cause of post-operative complications. This study compared blood loss and indicators of coagulation and fibrinolysis between TKA patients living at low or high altitudes.
Methods
We retrospectively analyzed 120 patients at our institution who underwent primary TKA from May 2019 to March 2020, and we divided them into those living in areas about 500 m or > 3000 m above sea level. We compared the primary outcome of total blood loss between them. We also compared them in terms of several secondary outcomes: coagulation and fibrinolysis parameters, platelet count, reduction in hemoglobin, hidden blood loss, intra-operative blood loss, transfusion rate, and incidence of thromboembolic events and other complications.
Results
Total blood loss was significantly higher in the high-altitude group than in the low-altitude group (mean, 748.2 mL [95% CI, 658.5–837.9] vs 556.6 mL [95% CI, 496.0–617.1]; p = 0.001). The high-altitude group also showed significantly longer activated partial thromboplastin time, prothrombin time, and thrombin time before surgery and on post-operative day one, as well as increased levels of fibrinogen/fibrin degradation product on post-operative days one and three. Ecchymosis was significantly more frequent in the high-altitude group (41.7 vs 21.7%; relative risk (RR) = 1.923 [95% CI, 1.091–3.389]; p = 0.019). The two groups showed similar transfusion rates, and none of the patients experienced venous thromboembolism, pulmonary embolism, or infection.
Conclusion
High altitude may alter coagulation and fibrinolysis parameters in a way that increases risk of blood loss after TKA. Such patients may benefit from special management to avoid bleeding events.
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Acknowledgements
We want to express our sincere appreciation for all the patients that joined this study.
Funding
This work was supported by the 1.3.5 project for disciplines of excellence, West China Hospital, Sichuan University (No. ZYJC18040).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Cheng-cheng Zhao, Li-yile Chen, Chang-jun Chen, Qiu-ru Wang, and Qian-hao Li. The first draft of the manuscript was written by Cheng-cheng Zhao and Li-yile Chen, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The trial was registered in the Chinese Clinical Trial Registry (ChiCTR2200060414), and ethically approved by Biomedical Ethics Committee of West China Hospital.
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The authors declare no competing interests.
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Zhao, Cc., Chen, Ly., Chen, Cj. et al. Does living at high altitude increase the risk of bleeding events after total knee arthroplasty? A retrospective cohort study. International Orthopaedics (SICOT) 47, 67–74 (2023). https://doi.org/10.1007/s00264-022-05614-8
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DOI: https://doi.org/10.1007/s00264-022-05614-8