title: Comparison of two intrauterine pressure catheters during labor.
abstract: OBJECTIVE
  To compare the Koala air-charged coupled catheter (Clinical Innovations, Inc., Murray, Utah) for monitoring intrauterine pressure (IUP) during active labor with an electronic pressure transducer-tip catheter, Intran Plus (Utah Medical Products, Midvale, Utah).
  
  
  METHODS
  Simultaneous recordings with Koala and Intran catheters bound together at their tips were made in 18 term patients using comparably calibrated fetal monitors.
  
  
  RESULTS
  Coefficients of correlation between the two IUP catheter systems for mean uterine baseline, peak pressures, contraction frequency and duration were .78, .90, 1.00 and .63, respectively. Both systems functioned equally well in displaying abnormal uterine activity. Some difficulty was encountered in placing the combined catheters in the amniotic fluid space: 4 of 18 (23%) were placed outside the chorionic membrane, in the extraovular space.
  
  
  CONCLUSIONS
  Comparisons of the recordings from the Koala and Intran Plus catheters showed similar mean baseline uterine tone, peak pressures, contraction frequency and duration.
authors.affiliation: Department of Obstetrics and Gynecology, Cassia Regional Medical Center, 1501 Hiland Avenue, Suite B-2, Burley, ID 83318, USA.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Dowdle
mesh_terms: D000293:Adolescent; D000328:Adult; D002404:Catheterization / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D005323:Fetal Monitoring / Q000379:methods; D006801:Humans; D007743:Labor, Obstetric / Q000502:physiology*; D011247:Pregnancy; D011312:Pressure; D015203:Reproducibility of Results; D014590:Uterine Contraction / Q000502:physiology*; D018590:Uterine Monitoring / Q000379:methods*; D014599:Uterus / Q000502:physiology