Behavioural assessment of fetal health.

The assessment of behavioural activity of the fetus is widely used to assess fetal health in clinical practice as part of the biophysical profile as well as the nonstress test. Considerable information regarding normal activity patterns of healthy human fetuses have been obtained from 24 to 40 weeks gestation. It is this information which has provided the scientific foundation for the development of fetal assessment protocols. Studies in chronically-catheterized fetal sheep have demonstrated that acute hypoxemia leads to an inhibition of fetal breathing movements although prolonged reductions in oxygen delivery to the fetus in the absence of acidemia are associated with adaptation by the fetus and subsequent return to normal incidence of behavioural activity. The behavioural responses of the fetus to specific stimuli including vibroacoustic stimulation have been examined in relation to gestational age as well as type of stimulus, it is proposed that fetal acoustic stimulation could possibly be used to assess fetal neurological function although prior to it being accepted as an universal method for assessing fetal health it is essential that a greater understanding of the mechanisms involved in fetal responses to sound and vibration be determined using appropriate experimental techniques.