title: Fetal scalp blood sampling during labor: an appraisal of the physiological basis and scientific evidence.
abstract: Fetal cardiotocography is characterized by low specificity; therefore, in an attempt to ensure fetal well-being, fetal scalp blood sampling has been recommended by most obstetric societies in the case of a non-reassuring cardiotocography. The scientific agreement on the evidence for using fetal scalp blood sampling to decrease the rate of operative delivery for fetal distress is ambiguous. Based on the same studies, a Cochrane review states that fetal scalp blood sampling increases the rate of instrumental delivery while decreasing neonatal acidosis, whereas the National Institute of Health and Clinical Excellence guideline considers that fetal scalp blood sampling decreases instrumental delivery without differences in other outcome variables. The fetal scalp is supplied by vessels outside the skull below the level of the cranial vault, which is likely to be compressed during contractions. The self-regulated redistribution of oxygenated blood from peripheral to central organs causes peripheral ischemia, thus theoretically bringing into question the scalp capillary bed as representative of the central circulation.
authors.affiliation: Women's Services, St. George's Healthcare NHS Trust, London, UK.
authors.forename: Edwin
authors.initials: E
authors.lastname: Chandraharan
authors.forename: Nana
authors.initials: N
authors.lastname: Wiberg
mesh_terms: D005260:Female; D005312:Fetal Blood / Q000502:physiology; D005316:Fetal Distress / Q000097:blood* / Q000175:diagnosis*; D005323:Fetal Monitoring; D006801:Humans; D007743:Labor, Obstetric / Q000502:physiology*; D011247:Pregnancy; D015203:Reproducibility of Results; D012535:Scalp / Q000098:blood supply*; D012680:Sensitivity and Specificity
keywords: Cardiotocography; Cochrane systematic review; fetal scalp blood sampling; fetal surveillance; instrumental delivery; lactate; pH