Should recommended laboratory-test cut-offs allowing surgery be followed for proximal femoral fractures in patients on direct oral anticoagulant therapy?

BACKGROUND

Proximal femoral fractures (PFFs) in elderly patients must receive prompt surgical treatment. Optimal PFF-surgery timing in patients on direct oral anticoagulant (DOA) therapy is a specific but common clinical issue. Recommendations exist about the anti-Xa or anti-IIa levels and creatinine clearance values required to allow surgery. The objectives of this study in patients older than 75 years who required PFF surgery were to evaluate bleeding when the recommendations were versus were not applied and to assess concordance between DOA-activity-assay results and creatinine clearance used to help determine the wait to surgery.

HYPOTHESIS

Peri-operative bleeding is more marked when surgery is performed while the DOA is still active.

PATIENTS AND METHODS

This single-centre, retrospective, comparative, observational study included 87 patients older than 75 years who required arthroplasty or intra-medullary nailing for PFF and were taking DOA therapy. Surgery was performed after versus before the laboratory-test results fell below the recommended cut-offs in 68 patients (Rec+ group) versus 19 patients (Rec- group), respectively. The study outcomes were blood loss estimated using the Mercuriali's formula and the proportion of patients requiring post-operative blood transfusions.

RESULTS

Mean blood loss was 287.1mL in the Rec+ group and 411.7mL in the Rec- group (p=0.12). Blood transfusions were required by a post-operative haemoglobin level below 0.8g/dL in 11 (16.2%) Rec+ patients and 6 (31.6%) Rec- patients (p=0.2). Concordance was poor between DOA activity and creatinine clearance (Cohen's κ, 0.16; p=0.146).

DISCUSSION

Peri-operative bleeding was not significantly more severe when PFF surgery was performed while DOA therapy was still active. These data suggest that PFF surgery within 48h may be appropriate in patients older than 75 years on DOA therapy.

LEVEL OF EVIDENCE

IV; retrospective single-centre study.

Can the prognostic score proposed by Elliot serve as an educational tool to shorten the time to surgery for hip fractures in geriatric patients?

INTRODUCTION

Hip fractures require surgical treatment within 48hours to decrease the risk of postoperative complications. Elliott proposed a prognostic score to identify which patients should be prioritized for surgery. This study was designed to answer the following questions: 1- Does using this score shorten the time to surgery? 2- Does shortening the time to surgery reduce mortality at 6 months and 1 year? 3- What factors delay the surgical procedure? We hypothesized that using this score as an educational tool would reduce the time to surgery in patients over 75 years of age who have a hip fracture.

MATERIAL AND METHODS

This single-center study involved two populations: 244 patients were included prospectively who had the score applied with the aim of optimizing the time to surgery; 476 patients were included from a historical cohort to serve as a reference group.

RESULTS

The mean time to surgery was 2.5 days±1.9 [95% CI: 2.41-2.77] and the median was 2 days (minimum 0, maximum 18 days) in the reference group; the mean was 1.4 days±1.0 [95% CI: 1.46-1.67] and the median was 1 day (min. 0, max 6 days) in the prospective cohort, which was a significant reduction (p<0.001). At 6 months, the mortality rate was 22.5% in the reference population and 23% in the prospective cohort. At 1 year, the mortality rate was 47% and 46%, respectively, with no significant difference. Surgical delays were attributed to lack of OR availability, management of anticoagulants, request for cardiac ultrasound and administrative reasons.

DISCUSSION/CONCLUSION

Elliot's prognostic at-risk score for hip fracture can shorten the time to surgery when used an educational tool to raise the medical staff's awareness of the benefits of rapid surgical care.

LEVEL OF EVIDENCE

IV; retrospective study without control group.