title: The influence of the direction of J-tip on the placement of a subclavian catheter: real time ultrasound-guided cannulation versus landmark method, a randomized controlled trial.
abstract: BACKGROUND
  It has been reported that the direction of the guidewire J-tip is associated with misplacement of a central venous catheter. We hypothesized that real-time ultrasound-guided infraclavicular subclavian venous cannulation would be less influenced by the direction of guidewire J-tip compared to landmark method.
  
  
  METHODS
  Sixty adult patients who required subclavian venous catheterization for neurosurgery were enrolled in this prospective randomized controlled study. Patients were randomly divided into a landmark group (n = 30) or an ultrasound group (n = 30). After the subclavian vein was punctured, the guidewire was advanced with the guidewire J-tip directed cephalad. Misplacement or advancement failure of the guidewire was regarded as an unsuccessful placement. Postoperative chest radiography was performed to confirm pneumothorax and the location of the catheter tip.
  
  
  RESULTS
  The two groups were comparable with respect to age, gender, height, and weight distribution. The incidence of unsuccessful guidewire placement was lower in the ultrasound group than in the landmark group (13% vs. 47%, P = 0.01). Among the unsuccessful guidewire placements, the incidence of misplacement were comparable between the groups and were all located in the ipsilateral internal jugular vein (7% vs. 7%). However, the incidence of advancement failure was significantly higher in landmark group (40% vs. 7%, P = 0.005). There were no complications such as pneumothorax or hemothorax.
  
  
  CONCLUSIONS
  The proper placement of guidewire was less influenced by the direction of the guidewire J-tip with ultrasound-guided subclavian venous cannulation than with the landmark approach.
authors.forename: Ah-Young
authors.initials: AY
authors.lastname: Oh
authors.affiliation: Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam, Korea. ytjeon@snubh.org.
authors.forename: Young-Tae
authors.initials: YT
authors.lastname: Jeon
authors.forename: Eun-Joo
authors.initials: EJ
authors.lastname: Choi
authors.forename: Jung-Hee
authors.initials: JH
authors.lastname: Ryu
authors.forename: Jung-Won
authors.initials: JW
authors.lastname: Hwang
authors.forename: Hee-Pyoung
authors.initials: HP
authors.lastname: Park
authors.forename: Sang-Hwan
authors.initials: SH
authors.lastname: Do
mesh_terms: D000328:Adult; D000368:Aged; D002405:Catheterization, Central Venous / Q000295:instrumentation / Q000379:methods*; D003199:Computer Systems; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013350:Subclavian Vein / Q000000981:diagnostic imaging*; D018084:Ultrasonography, Interventional / Q000295:instrumentation / Q000379:methods*