title: Control of intrauterine fluid pressure during operative hysteroscopy.
abstract: OBJECTIVE
  To evaluate the safety of a commonly used piston pump that controls the infusion pressure of low-viscosity fluids in a continuous-flow hysteroscopic system during operative hysteroscopy.
  
  
  METHODS
  Consecutive patients requiring operative hysteroscopy.
  
  
  METHODS
  Three hospital facilities in the Midwest.
  
  
  METHODS
  Sequential sample of 250 women who underwent operative hysteroscopy.
  
  
  METHODS
  Endometrial ablations, resection of submucosal or pedunculated uterine leiomyomata with or without endometrial ablation, polyp resections, metroplasty, and lysis of synechiae.
  
  
  RESULTS
  The most serious complication of operative hysteroscopy is fluid overload due to intravasation into the patient's vascular system. Low-viscosity fluids were infused by the Zimmer Controlled Distention Irrigation System. The instrument uses a closed-feedback loop to monitor cavity pressure and automatically regulates the flow to maintain the set point pressure. It is designed to operate in a pressure range of 0 to 80 mm Hg and at flows in excess of 450 ml/minute. In 250 operative hysteroscopies no fluid complications occurred when intrauterine pressure was maintained below 80 mm Hg. No clinically significant differences in intravasation were seen in any type of operative hysteroscopy.
  
  
  CONCLUSIONS
  This controlled mechanical pump system with exact intrauterine pressure measurement reduced many technical difficulties associated with low-viscosity media, and created a safe environment for the media's use in operative hysteroscopy.
authors.affiliation: Department of Obstetrics and Gynecology, St. Luke's Hospital, Cedar Rapids, Iowa, USA.
authors.forename: G J
authors.initials: GJ
authors.lastname: Shirk
authors.forename: R J
authors.initials: RJ
authors.lastname: Gimpelson
mesh_terms: D004867:Equipment Design; D004869:Equipment Safety; D005119:Extravasation of Diagnostic and Therapeutic Materials / Q000517:prevention & control*; D005260:Female; D006801:Humans; D020702:Hysteroscopes; D015907:Hysteroscopy / Q000009:adverse effects / Q000379:methods; D007260:Infusion Pumps / Q000592:standards; D016343:Monitoring, Intraoperative; D011312:Pressure; D012494:Sampling Studies