title: [Examination of a new tube connector concerning the ventilation-leakage during intraoperative bronchoskopy and bronchal suction].
abstract: OBJECTIVE
  Intra-operative bronchial suction and bronchoscopy regularly diminishes ventilation pressures and volumes and causes a leakage of narcotic gases. This study was undertaken to compare the influence of a newly-developed connecting tube with check valve on these problems.
  
  
  METHODS
  Examinations were carried out in a pressure controlled test lung with ventilation pressures between 5 and 50 mbar. Usual tube connectors and newly developed connectors with check valve were examined with respect to ventilation pressures, ventilation volumes, and leakage before and after insertion of suction catheters and bronchoscopes.
  
  
  RESULTS
  Using normal connectors, ventilation pressures and volumes collapsed even at lowest expiratory pressures, and significant leakage occurred. The insertion of catheters or bronchoscopes had only little beneficial effects. In contrast, the new connectors with check valve showed only small leakage, even at high ventilation pressures.
  
  
  CONCLUSIONS
  The new tube connectors with check valve allow intra-operative suction and bronchoscopy under constant ventilation parameters with minor leakage of anaesthetic gas.
authors.affiliation: Medizinische Hochschule Hannover, Abteilung Anästhesiologie. Rahe-Meyer.Niels@MH-Hannover.de
authors.forename: N
authors.initials: N
authors.lastname: Rahe-Meyer
authors.forename: M
authors.initials: M
authors.lastname: Winterhalter
authors.forename: H-A
authors.initials: HA
authors.lastname: Adams
authors.forename: S
authors.initials: S
authors.lastname: Piepenbrock
mesh_terms: D018685:Anesthetics, Inhalation / Q000032:analysis; D020680:Bronchoscopes; D001999:Bronchoscopy; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation; D011175:Positive-Pressure Respiration; D011312:Pressure; D012121:Respiration, Artificial / Q000295:instrumentation*; D013396:Suction
chemical_list: D018685:Anesthetics, Inhalation