Maritta Kühnert, Stephan Schmidt
24 hour-CTG monitoring: comparison of normal pregnancies and pregnancies with placenta insufficiency
Aims: Routinely antepartal CTG will be recorded for
30 minutes to obtain normal resting phases, a decrease
of irregulatory due to hypoxia or to differentiate these
from each other. In case of early onset of hypoxia first
pathological findings might only be seen by chance in
incidentally recorded CTG. The goal of this study was,
if a continuous 24 hour-CTG will allow an earlier detection
of beginning hypoxia in case of placental insufficiency
compared to a routine CTG of 30 minutes.
Methods: 21 normal pregnancies and 17 patients with
placental insufficiency of ? 36 weeks had 24 hour-CTG's by means of telemetry. In both study groups fetal
heart rate (FHR) tracing included a full qualitative and
quantitative description. Comparison of the results of
both groups was done to look for early signs of pathological
findings concerning reduced fetal well-being.
Results: In comparison to normal pregnancies patients
with placental insufficiency had in 4.5% oscillation frequency
type A and an increase of saltatory and silent
oscillation. The number of accelerations and Dip 0 was
significantly reduced as well as accelerations in combination
with undulatory oscillation. Baseline tachycardia
and bradycardia showed significantly increasing quantity.
Conclusions: 24 hour-CTG is a good screening method
to detect early onset of hypoxia in case of beginning
placental insufficiency. The failure to find any clinically
significant difference in the diurnal variation of both
groups suggests, that less than 24 hour testing is required.
8 hour-CTG could be a compromise and a big
help to detect a fetus at risk earlier.
Journal of Perinatal Medicine, Walter de Gruyter
Print ISSN: 1619-3997
Volume: 29, 01/2001
Pages: 42 - 54
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