Relation between frequency of uterine contractions and human fetal cerebral oxygen saturation studied during labour by near infrared spectroscopy
Article first published online: 19 AUG 2005
BJOG: An International Journal of Obstetrics & Gynaecology
Volume 101, Issue 1, pages 44–48, January 1994
How to Cite
Peebles, D. M., Spencer, J. A. D., Edwards, A. D., Wyatt, J. S., Reynolds, E. O. R., Cope, M. and Delpy, D. T. (1994), Relation between frequency of uterine contractions and human fetal cerebral oxygen saturation studied during labour by near infrared spectroscopy. BJOG: An International Journal of Obstetrics & Gynaecology, 101: 44–48. doi: 10.1111/j.1471-0528.1994.tb13008.x
- Issue published online: 19 AUG 2005
- Article first published online: 19 AUG 2005
- Received 15 December 1992; Accepted 19 August 1993
Objective To investigate the effect of the frequency of uterine contractions on fetal cerebral oxygenation, using near infrared spectroscopy.
Design An observational study relating changes in the fetal cerebral concentrations of oxyhaemoglobin and deoxyhaemoglobin, measured from the start of one contraction to that of the next, to the time interval between contraction peaks observed by external tocography.
Setting A teaching hospital obstetric and neonatal unit.
Subjects Ten term fetuses during labour.
Results Changes in cerebral oxyhaemoglobin concentration were positively, and in deoxyhaemoglobin negatively, correlated with the time interval between contractions (P < 0.001). A mean contraction interval of 2.3 min was found below which the concentration of oxyhaemoglobin usually fell and that of deoxyhaemoglobin rose, indicating a fall in cerebral haemoglobin saturation. Conversely, longer contraction intervals were associated with findings indicative of a rise in cerebral haemoglobin saturation.
Conclusion Short contraction intervals (< 2.3 min) were associated with a decrease, and longer contraction intervals with an increase in fetal cerebral oxygen saturation. Contractions occurring repeatedly at intervals less than 2.3 min are likely to result in progressive cerebral desaturation.