title: Palmar arch backflow following radial forearm free flap harvest.
abstract: BACKGROUND
  Most surgeons advocate an Allen test (for occlusion of the radial or ulnar artery) and Doppler ultrasound examination before harvesting a forearm flap. In this study we attempted to correlate the results of these tests with intraoperative measurement of backflow pressure in the radial artery stump.
  
  
  METHODS
  Stump pressures were measured in 30 patients after the flap had been harvested and were compared with preoperative assessment and intraoperative measurements of mean arterial pressure (MAP).
  
  
  RESULTS
  Mean arterial backflow pressure (MABP) in the arterial stump varied from 27 to 55mm Hg (mean 40.5). The ratio of this value to the mean arterial pressure ranged from 0.39 to 0.89 (mean 0.59) and exceeding 0.5 in 21 patients (70%). There was no correlation between this ratio and the preoperative assessment.
  
  
  CONCLUSIONS
  These findings suggest that in the presence of a satisfactory Allen test and Doppler examination, there is adequate pressure in the palmar system to maintain vascular integrity of the donor hand after sacrifice of the radial artery. Despite the possibility of anatomical variants, the routine use of more invasive imaging is unnecessary.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Royal Surrey County Hospital, Egerton Road, Surrey GU2 7XX, Guildford, UK. c.kerawala@boltblue.com
authors.forename: C J
authors.initials: CJ
authors.lastname: Kerawala
authors.forename: I C
authors.initials: IC
authors.lastname: Martin
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure / Q000502:physiology; D005260:Female; D005542:Forearm / Q000098:blood supply; D006225:Hand / Q000098:blood supply*; D006801:Humans; D007430:Intraoperative Care; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D017534:Radial Artery / Q000000981:diagnostic imaging / Q000637:transplantation*; D012039:Regional Blood Flow / Q000502:physiology; D013524:Surgical Flaps; D017535:Ulnar Artery / Q000000981:diagnostic imaging / Q000502:physiology; D018608:Ultrasonography, Doppler