Evaluation and Comparison of Blood Loss during Different Ortognathic Surgeries

Accurate estimation of the amount of blood loss for predicting the need for transfusion during bimaxillary orthognathic surgery is important for maxillofacial surgeons and anesthesiologists. The aim of this study was to determine the amount of blood loss during various types of orthognathic surgery.
A total of 92 patients were selected and were separated into two groups of monomaxillary & bimaxillary. All the surgeries were performed in Ghaem Hospital of Mashhad University of Medical Sciences under anesthesia with deliberate hypotension.Blood pressure during surgery was maintained under 100 mm/hg. Surgical blood losses was measured by the amount of blood in the surgical suction unit and counting the number of gauze pads saturated with blood by the anesthesiologiste and at the end of surgery was recorded. In the end, the amount of blood loss was determined separately according to the type of surgery & was statistically analyzed.
The study sample consisted of 92 subjects with a mean age of 23.6±3.64 years and all of the subjects completed the study. The average surgical blood loss was 351.63 ml. Mann-Whitney Test showed that the amount of blood loss in class II was significientlya higher than class III (monomaxillary P=0.040 and bimaxillary P=0.008). Blood loss in monoaxillary surgery was significiently less than bimaxillary surgery (P According to the present study, the amount of bleeding among different types of orthognathic surgeries is different depending on type & number of surgery and these factors are important in estimating the amount of blood loss and peredicting the necessary actions in order to replace the lost blood volume.