title: [Evaluation and Optimization of Microvascular Arterial Anastomoses by Transit Time Flow Measurement].
abstract: INDRODUCTION: The regular application of transit time flow measurement in microvascular anastomoses during heart surgery has lead to improvements of the outcome of coronary artery bypass grafts. Our study was meant to discover whether this measurement method was also applicable for evaluation and optimization of microvascular arterial anastomoses of radial forearm flaps.
  
  
  METHODS
  In this prospective examination a combining ultrasound imaging and transit time flow measurement device (VeriQ, MediStim) was used during surgery to assess anastomotic quality of 15 radial forearm flaps. Pulsatility index (PI) and mean blood flow were measured immediately after opening the arterial anastomosis as well as 15 min afterwards. Furthermore, application time and description of handling were recorded seperately for every assessment.
  
  
  RESULTS
  Mean blood flow immediately after opening the anastomosis and 15 min later were 3.9 and 3.4 ml/min resepectively showing no statistically significant difference (p=0.96). There was no significance in the increase of pulsatility index from 22.1 to 27.2 (p=0.09) during the same time range, either. Due to measurement results showing atypical pulse curves in 2 cases decision for surgical revision of the anastomoses was made. All forearm flaps showed good vascularisation during follow-up. Time for device set up, probe placement and measurements was about 20 min. Handling was described to be uncomplicated without exception. There were no noteworthy problems.
  
  
  CONCLUSIONS
  Transit time flow measurement contributes to the improvement of anastomotic quality and therefore to the overall outcome of radial forearm flaps. The examined measurement method provides objective results and is useful for documentation purposes.
authors.affiliation: HNO-Klinik, Universität Bonn, Bonn.
authors.forename: S
authors.initials: S
authors.lastname: Herberhold
authors.affiliation: HNO-Klinik, Universität Bonn, Bonn.
authors.forename: J
authors.initials: J
authors.lastname: Röttker
authors.affiliation: HNO-Klinik, Universität Bonn, Bonn.
authors.forename: D
authors.initials: D
authors.lastname: Bartmann
authors.affiliation: Klink für Kardiochirurgie, Universität Bonn, Bonn.
authors.forename: A
authors.initials: A
authors.lastname: Solbach
authors.affiliation: HNO-Klinik, Universität Bonn, Bonn.
authors.forename: S
authors.initials: S
authors.lastname: Keiner
authors.affiliation: Klink für Kardiochirurgie, Universität Bonn, Bonn.
authors.forename: A
authors.initials: A
authors.lastname: Welz
authors.affiliation: HNO-Klinik, Universität Bonn, Bonn.
authors.forename: F
authors.initials: F
authors.lastname: Bootz
authors.affiliation: HNO-Klinik, Universität Bonn, Bonn.
authors.forename: W
authors.initials: W
authors.lastname: Laffers
mesh_terms: D000714:Anastomosis, Surgical; D001783:Blood Flow Velocity; D001810:Blood Volume; D058752:Free Tissue Flaps / Q000098:blood supply* / Q000601:surgery*; D006801:Humans; D007012:Hypopharyngeal Neoplasms / Q000601:surgery; D008297:Male; D008866:Microsurgery; D008875:Middle Aged; D009959:Oropharyngeal Neoplasms / Q000601:surgery; D010039:Otorhinolaryngologic Neoplasms / Q000601:surgery*; D011183:Postoperative Complications / Q000175:diagnosis* / Q000503:physiopathology* / Q000601:surgery; D011446:Prospective Studies; D063177:Pulse Wave Analysis; D012086:Reoperation; D014463:Ultrasonography / Q000295:instrumentation*