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A decade of experience in over 300 surgically treated spine patients with long-term oral anticoagulation: a propensity score matched cohort study

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Abstract

Purpose

The aim of this study was to investigate the risks and outcomes of patients with long-term oral anticoagulation (OAC) undergoing spine surgery.

Methods

All patients on long-term OAC who underwent spine surgery between 01/2005 and 06/2015 were included. Data were prospectively collected within our in-house Spine Surgery registry and retrospectively supplemented with patient chart and administrative database information. A 1:1 propensity score-matched group of patients without OAC from the same time interval served as control. Primary outcomes were post-operative bleeding, wound complications and thromboembolic events up to 90 days post-surgery. Secondary outcomes included intraoperative blood loss, length of hospital stay, death and 3-month post-operative patient-rated outcomes.

Results

In comparison with the control group, patients with OAC (n = 332) had a 3.4-fold (95%CI 1.3–9.0) higher risk for post-operative bleeding, whereas the risks for wound complications and thromboembolic events were comparable between groups. The higher bleeding risk was driven by a higher rate of extraspinal haematomas (3.3% vs. 0.6%; p = 0.001), while there was no difference in epidural haematomas and haematoma evacuations. Risk factors for adverse events among patients with OAC were mechanical heart valves, posterior neck surgery, blood loss > 1000 mL, age, female sex, BMI > 30 kg/m2 and post-operative PTT levels. At 3-month follow-up, most patients reported favourable outcomes with no difference between groups.

Conclusion

Although OAC patients have a higher risk for complications after spine surgery, the risk for major events is low and patients benefit similarly from surgery.

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Acknowledgements

We thank all the patients of the Schulthess Klinik who have contributed data to our in-house registry. We thank Gordana Balaban, Julian Amacker, Kirsten Clift, Selina Nauer, Sara Preziosa, Stephanie Dosch, Riccardo Curatolo and Dorian Braun for the administration of the Spine Tango Surgery and Patient Self-Assessment forms.

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Correspondence to Tamás F. Fekete.

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Sweda, R., Mannion, A.F., O’Riordan, D. et al. A decade of experience in over 300 surgically treated spine patients with long-term oral anticoagulation: a propensity score matched cohort study. Eur Spine J 33, 1360–1368 (2024). https://doi.org/10.1007/s00586-024-08134-8

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  • DOI: https://doi.org/10.1007/s00586-024-08134-8

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