PURPOSE:
The purpose of this study is assessment of blood loss in orthognathic
surgery using nitroglycerine induced hypotensive anaesthesia and comparison
of pre and postoperative haemoglobin, haematocrit and means arterial
pressure.
MATERIALS AND METHOD:
10 young orthognathic patients were operated under hypotensive
anaesthesia included in this study. Operations were Anterior maxillary
osteotomies (n=6), Lefort I osteotomy (n=1), BSSRO (n=3), Sub apical
osteotomy (n=1), Genioplasty (n=3). Pre and Post operative Haemogram, intra
operative blood loss, duration of surgery were the studied parameters.
Statistical analysis was performed using SPSS version 19.
RESULTS:
None of the patient required blood transfusion. Mean blood loss was
174.19ml with a range of 77.60 ml to maximum of 283 ml. Mean duration was
174 min with minimum of 75 min and maximum of 290 min. Mean preop Hb
level was 12.14 gm%/dl and the mean postop Hb level was 10.14 gm%/dl.
Mean preop Haemotocrit was 40.50% and postop Haemotocrit was 30.18%.
The mean arterial pressure was 72.86 mmHg with a minimum of 63.30 mmHg
and maximum of 78.60 mmHg.
CONCLUSION:
Blood transfusion in orthognathic surgery could be prevented by
induction of Nitroglycerine as hypotensive anaesthetic agent and reduces the
length of surgery by improving the quality of surgical field
