title: A randomized trial comparing two cuffed emergency cricothyrotomy devices using a wire-guided and a catheter-over-needle technique.
abstract: BACKGROUND
  According to different algorithms of airway management, emergency cricothyrotomy is the final step in managing the otherwise inaccessible airway. As an alternative to an open surgical procedure, minimally invasive approaches exist. Various sets for different methods are commercially available. QuickTrach™ (VBM Medizintechnik GmbH, Sulz am Neckar, Germany) contains a plastic cannula over a metal needle for direct placement in the trachea, whereas a guide-wire is used for the actual placement of the cannula in the Melker Set™ (Cook Group Incorporated, Bloomington, IN).
  
  
  OBJECTIVE
  We hypothesize that the direct puncture involving less discrete steps is faster to perform. However, it will lead to more complications due to the higher force needed to place the relatively thick needle.
  
  
  METHODS
  After approval of the local ethics committee, the study was performed on cadavers of 16 adult sheep. A wire-guided cricothyrotomy was compared with a catheter-over-needle technique. Successful placement and performance time were compared. Complication rate and maximal achieved airway pressure were evaluated. Data is given as mean and interquartile range, and Mann-Whitney U-test (p < 0.05) for significant differences.
  
  
  RESULTS
  With the wire-guided technique, successful placement was possible in all attempts. The catheter-over-needle method was successful in 63% and had a higher complication rate (75% vs. 13%). The cannula-over-needle method allowed a faster cricothyrotomy (32 [2-34] vs. 53 [52-56] s). Both methods allowed the delivery of similar maximal airway pressures (50 [44-51] vs. 48 [43-53] mbar).
  
  
  CONCLUSIONS
  The wire-guided method proved to be the more reliable technique, leading to fewer complications. However, the direct puncture was faster to perform. Placed accurately, both devices allowed sufficient ventilation.
authors.affiliation: Department of Anesthesiology, University of Würzburg, Würzburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Metterlein
authors.forename: Matthias
authors.initials: M
authors.lastname: Frommer
authors.forename: Christian
authors.initials: C
authors.lastname: Ginzkey
authors.forename: Jan
authors.initials: J
authors.lastname: Becher
authors.forename: Frank
authors.initials: F
authors.lastname: Schuster
authors.forename: Norbert
authors.initials: N
authors.lastname: Roewer
authors.forename: Peter
authors.initials: P
authors.lastname: Kranke
mesh_terms: D000818:Animals; D002102:Cadaver; D003413:Cricoid Cartilage / Q000601:surgery*; D004635:Emergency Medicine / Q000379:methods*; D011897:Random Allocation; D012756:Sheep; D013957:Thyroid Cartilage / Q000601:surgery*; D014140:Tracheotomy / Q000295:instrumentation* / Q000379:methods