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  • Title: Effects of fetal and maternal breathing on the ultrasonic Doppler signal due to fetal heart movement.
    Author: Karlsson B, Berson M, Helgason T, Geirsson RT, Pourcelot L.
    Journal: Eur J Ultrasound; 2000 Mar; 11(1):47-52. PubMed ID: 10717514.
    Abstract:
    Fetal heart rate (FHR) monitoring is widely used to evaluate fetal health and is based on the detection of movements of the fetal heart by Doppler ultrasound. Fetal health can also be evaluated by prolonged observation of body- and pseudo-respiratory movements using two-dimensional ultrasound. Fetal breathing movements are in particular considered to be an important indicator of fetal well being. Ultrasonic Doppler signals caused by movements of the fetal heart were analyzed in detail. The signals were acquired from five healthy fetuses. Minor changes in the insonification geometry gave rise to great variations in the aspects of successive heartbeats. The signals are shown to contain information on both maternal and fetal respiratory movements. This may facilitate the development of a simple method for fetal respiration monitoring coupled to standard FHR monitoring.
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