Background: Hip arthroplasty is a surgery with a high risk of bleeding. The main objective of this study was to research risk factors for bleeding and transfusion in patients undergoing hip arthroplasty in order to guide a blood-saving program. Method: Retrospective, monocentric, descriptive and analytical study carried out from June 2011 to June 2021 at the Omar Bongo Ondimba army training hospital. The variables studied were demographic characteristics, biological variables, transfusion data, anesthetic and intraoperative data. The primary outcome was intraoperative or postoperative transfusion. A univariate and multivariate analysis was conducted to identify the factors associated with the occurrence of a transfusion. Results: Of the 276 patients included, 179 benefited from Total Hip Prosthesis (THP) and 97 from Intermediate Hip Prosthesis (IHP). Spinal anesthesia was performed in 67.4% of patients. The ASA 2 score predominated (65.9%). The transfusion incidence was 56.9% (157/276). Tranexamic acid was used in 16.3% (45/276) of patients. The average bleeding was 528 ± 405 ml. Preoperative anemia (OR = 0.78, 95% CI [0.66 -0.91]) and total hip prosthesis (OR = 2.02 95% CI [1.11 -3.67]) were predictors of bleeding and transfusion to be significant. The average serum hemoglobin predictive of a transfusion was 11.6 ± 1.8. ASA score and operative time were not found as risk factors for bleeding and transfusion. Conclusion: The incidence of transfusion is high. Preoperative anemia remains a major but modifiable risk factor unlike the choice of implant. The implementation of a patient blood management protocol could reduce this transfusion incidence.

Context: Subparaneural injection (under the nerve sheath) has reduced the onset of action and the effectiveness of local anesthetics in sciatic blocks. The objective of this work was to assess the effectiveness of this technique in axillary blocks in two hospitals in France and Gabon. Method: From January 1 to February 28, 2019, patients were included for upper limb surgery under xylocaine or Ropivacaine. The installation time, effectiveness, occurrence of paresthesia, and vascular breaches were assessed. Results: 141 patients were included, mostly male (64.55%), with an ASA 1 score (46.1%), hand surgery predominated (95%) most often performed as scheduled surgery (68.1%). Block was performed by the anesthesiologist in 39% of patients and by the anesthesiologist student in 61% of patients. The success rate was 88.66% with an installation time of 15 min, some paresthesias were noted. Despite the lack of expertise from a Gabonese hospital center, the data were compared to the literature. Conclusion: Ultrasound-guided subparaneural injection axillary block is an effective, safe technique with a rapid learning curve.