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  • Title: Occurrence of ST-changes recorded with the STAN S21-monitor during normal and abnormal fetal heart rate patterns during labour.
    Author: Kwee A, Dekkers AH, van Wijk HP, van der Hoorn-van den Beld CW, Visser GH.
    Journal: Eur J Obstet Gynecol Reprod Biol; 2007 Nov; 135(1):28-34. PubMed ID: 17134817.
    Abstract:
    OBJECTIVE: To determine the frequency of ST-changes in the fetal electrocardiogram (ECG) both during normal and abnormal fetal heart (FHR) traces and to study relations with characteristics of pregnancy and delivery. STUDY DESIGN: Retrospective analysis of 563 FHR+ECG-recordings. ST-changes were counted for all recordings with respect to their FHR pattern. Relationships between the occurrence of ST-events and characteristics of pregnancy and delivery were determined for the recordings with a completely normal FHR tracing during the first stage. RESULTS: ST-events were present during 51.7% of recordings in the first stage of labour and during 24.3% of the recordings in the second stage. Surprisingly, events occurred during the first stage at a similar incidence during normal and abnormal FHR-patterns. During the second stage of labour events also occurred in a similar percentage of normal, intermediary and abnormal recordings, but - if present - events were more numerous during the abnormal FHR traces. In the subgroup of cases with a normal FHR pattern more events per hour occurred in babies born at 36-37 weeks of gestation and in boys. CONCLUSION: ST-events are a frequent finding during normal FHR tracings.
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