title: Cardiovasular changes after placement of a classic endotracheal tube, double-lumen tube, and Laryngeal Mask Airway.
abstract: OBJECTIVE
  To compare hemodynamic responses, P wave dispersion (Pd), and QT dispersion (QTd) after placement of a classic endotracheal tube (ETT), double-lumen tube (DLT), or Laryngeal Mask Airway (LMA).
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Outpatient surgery center.
  
  
  METHODS
  75 adult, ASA physical status 1 and 2 patients undergoing cystoscopy and thoracoscopic surgery.
  
  
  METHODS
  Patients were randomized to undergo placement of an ETT (Group T; n = 25), DLT (Group D; n = 25), or LMA (Group L; n = 25). Anesthesia was induced by etomidate 0.3 mg/kg and fentanyl 1.0 μg/kg, and maintained with nitrous oxide, oxygen, 2% to 3% sevoflurane, and rocuronium 0.5 mg/kg.
  
  
  METHODS
  Mean arterial pressure (MAP) and heart rate (HR) were recorded immediately before intubation and after intubation at one, 3, 5, 10,15, 20, 25, and 30 minutes after intubation/airway insertion.
  
  
  RESULTS
  QT dispersion after tube placement was significantly higher than before tube placement in Group D (P = 0.0001) and Group L (P = 0.03). Mean arterial pressure and HR in Group T were significantly higher than in Group L at the first minute after tube placement (P = 0.02). Heart rate and MAP at baseline were significantly higher than the other measurement times in Groups T and D (P < 0.01).
  
  
  CONCLUSIONS
  The LMA caused no change in Pd, HR, or MAP values during or after airway placement, but caused QTd after airway insertion. The ETT caused a sudden increase at the first minute after tube placement, without any Pd or QTd. In addition, DLT caused QTd without any serious change in hemodynamics.
authors.affiliation: Department of Anaesthesiology and Reanimation, Gaziantep University School of Medicine, 27310 Sahinbey, Gaziantep, Turkey. aysemizrak@hotmail.com
authors.forename: Ayse
authors.initials: A
authors.lastname: Mizrak
authors.forename: Betul
authors.initials: B
authors.lastname: Kocamer
authors.forename: Hayati
authors.initials: H
authors.lastname: Deniz
authors.forename: Fatih
authors.initials: F
authors.lastname: Yendi
authors.forename: Unsal
authors.initials: U
authors.lastname: Oner
mesh_terms: D000328:Adult; D000556:Ambulatory Surgical Procedures / Q000379:methods; D000758:Anesthesia / Q000379:methods; D001794:Blood Pressure; D003558:Cystoscopy / Q000379:methods; D004311:Double-Blind Method; D005260:Female; D006339:Heart Rate; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation / Q000379:methods*; D017214:Laryngeal Masks; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013906:Thoracoscopy / Q000379:methods; D013997:Time Factors; D055815:Young Adult