title: Continuous fetal scalp tissue pH monitoring during labor. An analysis of 152 consecutive cases.
abstract: Continuous scalp tissue pH monitoring was performed in 152 consecutive cases. The success rate was 53 per cent. The average duration of pH monitoring was 151 minutes (range 0--609 minutes). A good correlation was found between tissue pH at delivery and blood pH in the umbilical artery (r = 0.78) and vein (r = 0.67). In no case with normal tissue pH (more than 7.20) and abnormal CTG was the Apgar score less than 8 one minute after delivery. A normal tissue pH almost always means that the fetus is not asphyxiated, but a low tissue pH reading may be caused by other factors than acidosis of the fetus. Continuous pH monitoring during labor remains a research method.
mesh_terms: D004566:Electrodes; D005260:Female; D005312:Fetal Blood / Q000502:physiology; D005323:Fetal Monitoring / Q000295:instrumentation; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000175:diagnosis; D007744:Obstetric Labor Complications / Q000175:diagnosis / Q000503:physiopathology; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D012535:Scalp / Q000196:embryology / Q000502:physiology*; D014469:Umbilical Arteries