title: Investigating the failure to aspirate subglottic secretions with the Evac endotracheal tube.
abstract: BACKGROUND
  Aspiration of subglottic secretions is a widely used intervention for prevention of ventilator-associated pneumonia. However, using the Hi-Lo Evac endotracheal tube (Hi-Lo Evac; Mallinckrodt; Athlone, Ireland) (Evac ETT), dysfunction of the suction lumen and subsequent failure to aspirate the subglottic secretions are common. Our objective in this study was to determine the causes of suction lumen dysfunction experienced with the Evac ETT.
  
  
  METHODS
  We studied 40 adult patients intubated with the Evac ETT. In all cases for which dysfunction of the suction lumen was observed, the subglottic suction port was examined visually using a flexible bronchoscope.
  
  
  RESULTS
  Dysfunction of the suction lumen occurred in 19 of 40 patients (48%). In 17 of these (43%), it was attributed to blockage of the subglottic suction port by suctioned tracheal mucosa.
  
  
  CONCLUSIONS
  Evacuation of subglottic secretions using the Evac ETT is often ineffective due to prolapse of tracheal mucosa into the subglottic suction port.
authors: Department of Intensive Care, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece. christosdragoumanis@gmail.com
authors: Christos K
authors: CK
authors: Dragoumanis
authors: George I
authors: GI
authors: Vretzakis
authors: Vassilios E
authors: VE
authors: Papaioannou
authors: Vassilios N
authors: VN
authors: Didilis
authors: Theodsia D
authors: TD
authors: Vogiatzaki
authors: Ioannis A
authors: IA
authors: Pneumatikos
mesh_terms: D000368:Aged; D005260:Female; D005931:Glottis / Q000378:metabolism*; D006801:Humans; D007442:Intubation, Intratracheal / Q000009:adverse effects / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D020545:Respiratory Mucosa / Q000293:injuries / Q000473:pathology; D013396:Suction / Q000009:adverse effects / Q000295:instrumentation*; D014132:Trachea / Q000293:injuries / Q000473:pathology