title: Intrapartum reflectance pulse oximetry: effects of sensor location and fixation duration on oxygen saturation readings.
abstract: OBJECTIVE
  To determine the effects of sensor location and suction fixation duration on measurements of intrapartum fetal oxygen saturation (SpO2) with a new reflectance pulse oximetry system.
  
  
  METHODS
  Fetal SpO2 values (n = 18) were determined in the first stage of labor before and after moving the sensor to another part of the fetal head.
  
  
  RESULTS
  Mean fetal SpO2 values did not differ with sensor location (95% CI: -3.59 to 1.48). The duration of measurement period 1, before moving the sensor, was 104 +/- 44 (range 30-240) min. No time-dependent changes in SpO2 values were seen (r = 0.17).
  
  
  CONCLUSIONS
  Suction is an effective and noninvasive method of securing the reflectance pulse oximetry sensor to the fetal head in the first stage of labor and does not interfere with reproducible SpO2 values over several hours.
authors.affiliation: Unit of Perinatal Physiology, University Hospital of Zurich, Switzerland.
authors.forename: K
authors.initials: K
authors.lastname: Faisst
authors.forename: P
authors.initials: P
authors.lastname: Kirkinen
authors.forename: V
authors.initials: V
authors.lastname: König
authors.forename: A
authors.initials: A
authors.lastname: Huch
authors.forename: R
authors.initials: R
authors.lastname: Huch
mesh_terms: D000328:Adult; D005260:Female; D005312:Fetal Blood / Q000737:chemistry*; D005323:Fetal Monitoring; D006801:Humans; D007743:Labor, Obstetric; D010092:Oximetry / Q000295:instrumentation; D010100:Oxygen / Q000097:blood*; D011247:Pregnancy
chemical_list: D010100:Oxygen