Based upon a previously described procedure for automated baseline determination in antepartum fetal heart rate recordings, a programme has been developed for recognition of accelerations and ...decelerations. Detection of these deviations from the baseline depends on criteria for amplitude and duration, with special account for signal loss. The described automated analysis provides an objective tool for description of antepartum fetal heart rate patterns. A first evaluation with respect to its capacity to discriminate between different fetal heart rate patterns in relation to fetal rest-activity patterns shows promising results.
The relationship between fetal movements and fetal heart rate accelerations was analyzed in 34 healthy near term fetuses. Periods of coincidence 2F (C2F) with a mean duration of 34 +/- 6 minutes per ...fetus were selected, with a total of 463 accelerations. Nineteen percent of single body movements and 71% of compilations of movements were accompanied by an acceleration. The minimal duration of single movements associated with accelerations was 4-5 seconds. Movements with associated accelerations differed significantly in duration from movements without accelerations. The duration of accelerations was strongly correlated with the duration of movements. The amplitude of accelerations was not clearly correlated with the duration of movements, but depended on the type of movement. The shape of accelerations appeared to be dependent on the timing of the various fetal movements. In 77%, the number of notches in the accelerations was equal to the number of pauses in the movement complications. A discrepancy between notches in accelerations and pauses in movements could be explained in the majority of cases when the timing of the various movements in relation to one another was considered, or by the presence of fetal mouth movements.
Fetal heart rate variation during fetal regular mouthing in behavioural state 1F was investigated applying spectral analysis. Periods with and without fetal regular mouthing movements were compared. ...The power spectrum of the periods with regular mouthing movements showed a peak at the frequency of the clusters of mouthing movements which was absent in the power spectrum of the corresponding periods without movements. The oscillations in the fetal heart rate associated with this peak in the power spectrum were detectable both in the heart rate tracings obtained from the abdominal electrocardiogram and those recorded by means of wide range Doppler ultrasound.
Fetal behavioural states in epileptic pregnancies van Geijn, H P; Swartjes, J M; van Woerden, E E ...
European journal of obstetrics & gynecology and reproductive biology,
05/1986, Letnik:
21, Številka:
5-6
Journal Article
Recenzirano
Possible negative effects of maternal antiepileptic medication on fetal motility and heart rate patterns were examined at 32 and 38 wk of gestation. Fetal eye and body movements were recorded using 2 ...real-time ultrasound units. Comparison between pregnancies with antiepileptic medication and control pregnancies did not show marked differences in patterns of motility and heart rate. Duration of sleep states, occurrence and duration of body movements in state 2F and statistical parameters of heart rate level and heart rate variability were very similar for both groups. This preliminary study, limited to mostly combined treatment with antiepileptic drugs, could not demonstrate any obvious effect on fetal neuromuscular development from maternal antiepileptic medication.
A study concerning the relationship between neonatal neurological abnormality and 3 parameters of pre- and perinatal condition in a birth cohort of 1507 infants was replicated in a second cohort of ...1655 infants. The 3 parameters chosen were preterm birth, intrauterine growth retardation and neonatal acidemia. The neurological examination in the second cohort was carried out by other examiners than in the first cohort. The incidence of neurological abnormality was again found to be raised in all 3 categories and again least in the acidemic subgroup. Also the finding could be confirmed that only in about half of the neurologically abnormal infants could the 3 parameters have exerted any effect at all, which implies the necessity of further analysis. This replication study shows that neurological examination in the newborn period is a reliable tool for the evaluation of the condition of infants with respect to their pre- and perinatal history.
The efferent fiber connections of the caudal half of the cerebral cortex, the lateral cortex and the pallial thickening were studied using the Nauta-Gygax and Fink-Heimer techniques. The following ...observations were made, (1) In the caudal half of the hemisphere corticoseptal and corticohypothalamic fibers originate from the small-celled part of the mediodorsal cortex and the thickened caudal part of the dorsal cortex in its whole mediolateral extent. (2) The dorsal cortex in the middle of the hemisphere projects by way of both the pre- and postcommissural fornices. Its rostral pole distributes its fibers solely to the postcommissural fornix, whereas its caudal part projects via the precommissural fornix. (3) The posterior pallial commissure carries fibers that arise caudally in the small-celled part of the mediodorsal cortex and terminate in the contralateral ventral cortex. (4) Projections to the dorsal striatum originate from the lateral cortex, the dorsal cortex and the superficial portion of the pallial thickening. In addition, the latter two zones project to the nucleus accumbens. (5) The deep portion of the pallial thickening projects to the ventral striatum.
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