Predictors of blood loss during orthognathic surgery: outcomes from a teaching institution.
OBJECTIVE
The objective of the study was to correlate different orthognathic surgical procedures with operating time and blood loss, reported from an accredited resident training institution.


METHODS
Ninety-five patient records were evaluated retrospectively. Individual blood volume, percent blood volume lost (BVL), and estimated blood loss (EBL) for each patient were recorded and correlated with operating time (OT). Statistics included independent t tests, one-way analysis of variance, and linear regression.


RESULTS
The mean OT for all procedures was 203 min with mean blood loss 556 ml. Mean EBL for males was 676 ml versus 468 ml for females. Overall BVL was 12.4 %, while for males, BVL was 13.3 % compared to 11.8 % for females. For a single orthognathic procedure (n = 45), mean OT 145 min., EBL 414 ml, and BVL 9.0 %; two procedures (n = 41), mean OT was 239 min., EBL 659 ml, and BVL 15 %; three procedures (n = 9), mean OT 328 min, EBL 793 ml, and BVL was 17 %.


CONCLUSIONS
Examination of individual procedures suggests a shorter OT for Le Fort I procedures with slightly greater EBL. Concomitant orthognathic procedures are associated with greater OT and EBL. Blood volume should be calculated for male and female patients separately. Percent BVL can be predicted based on OT using a basic equation.
School of Dental Medicine, Department of Oral and Maxillofacial Surgery, Case Western Reserve University, Cleveland, OH, USA. kmsdental@sbcglobal.net.
Keith M
KM
Schneider
Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Akdeniz University, Dumlupinar Boulevard 07058 Campus, Antalya, Turkey. malialtay@hotmail.com.
Mehmet Ali
MA
Altay
School of Dental Medicine, Department of Community Dentistry, Case Western Reserve University, Cleveland, OH, USA. cad3@case.edu.
Catherine
C
Demko
School of Dental Medicine, Department of Oral and Maxillofacial Surgery, Case Western Reserve University, Cleveland, OH, USA. isabelatencioa@hotmail.com.
Isabel
I
Atencio
School of Dental Medicine, Department of Oral and Maxillofacial Surgery, Case Western Reserve University, Cleveland, OH, USA. dale.baur@case.edu.
Dale A
DA
Baur
School of Dental Medicine, Department of Oral and Maxillofacial Surgery, Case Western Reserve University, Cleveland, OH, USA. faq@case.edu.
Faisal A
FA
Quereshy
D000293:Adolescent; D000328:Adult; D005260:Female; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D000066794:Oral and Maxillofacial Surgeons / Q000193:education; D057909:Orthognathic Surgery; D017063:Outcome Assessment, Health Care; D019106:Postoperative Hemorrhage / Q000209:etiology*; D012189:Retrospective Studies; D018570:Risk Assessment; D055815:Young Adult
Blood loss; Operating time; Orthognathic surgery; Residency; Training