title: Pressure signal transmission of five commercially available oesophageal balloon catheters.
abstract: OBJECTIVE
  Five commercially available oesophageal balloon catheters (OBCs) were tested to evaluate the accuracy in transmitting fast-changing pressure signals which can be observed, for example, during phrenic nerve stimulation.
  
  
  METHODS
  Research laboratory of a university hospital.
  
  
  METHODS
  The OBCs tested varied in length (900-1390 mm) and inner diameter (0.9-1.5 mm) as well as in balloon material [latex or polyvinylchloride (PVC)]. A 180-cm tube served as a control. A sudden pressure drop was generated by the explosion of a pressurized latex balloon. The time between the pressure drop and 75, 50, 25 and 10% of the maximal pressure was measured.
  
  
  RESULTS
  The time intervals required to transduce a pressure drop of 90% varied between the different OBCs from 85 to 476 ms (control 32 ms). Transmission time was lower in OBCs with a larger inner diameter. Shortening the OBCs resulted in a further decrease in transmission time.
  
  
  CONCLUSIONS
  The type of OBC used has an impact on signal processing. An OBCs with a short transmission time should be chosen, especially if fast pressure changes are to be evaluated such as during phrenic nerve stimulation.
authors.affiliation: Zentrum Anaesthesiologie, Rettungs- und Intensivmedizin, George-August Universität Göttingen, Germany. hbusche@gwdg.de
authors.forename: H
authors.initials: H
authors.lastname: Buscher
authors.forename: P
authors.initials: P
authors.lastname: Valta
authors.forename: M
authors.initials: M
authors.lastname: Sydow
authors.forename: K
authors.initials: K
authors.lastname: Thies
authors.forename: H
authors.initials: H
authors.lastname: Burchardi
mesh_terms: D000704:Analysis of Variance; D002404:Catheterization / Q000295:instrumentation*; D004947:Esophagus / Q000502:physiology*; D006801:Humans; D008365:Manometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014160:Transducers, Pressure; D014939:Work of Breathing