Intraoperative blood loss during an osteotomy of the bilateral vertical ramus

Background/purposeWe studied the correlation between clinical covariates and blood loss under hypotensive anesthesia, in patients undergoing a bilateral vertical ramus osteotomy (BVRO).Materials and methodsBVROs were performed on 37 patients with mandibular prognathism. The preoperative and postoperative values of blood constituents were examined and analyzed. Correlations among blood loss, sex, age, operative time, and reduced values of blood constituents were statistically assessed.ResultsThe average operative time was 255.5 ± 42.56 minutes, and blood loss was 105.9 ± 66.83 mL. No patient required a blood transfusion in this study. There were no significant correlations between blood loss and related factors (sex, operative time, and reductions in blood constituents). Comparing sexes, blood loss and reductions in blood constituents exhibited non-significant differences. However, male patients had significantly larger values for presurgical and postsurgical blood constituents than female patients.ConclusionIn our study, blood loss was acceptable in patients who underwent a BVRO, and thus, no preoperative autologous blood donation was necessary.