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Journal of the Society for Gynecologic Investigation
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Periodic Fetal Heart Rate Decelerations During 6 Hours' Hypoxemia Induced in Goats

Hiroshi Sameshima, MD

Perinatal Center and Department of Obstetrics and Gynecology, Miyazaki Medical College, Miyazaki; Department of Obsterics and Gynecology, Kagoshima City Hospital, Kagoshima; the Department of Veterinary Medicine, Kagoshima University, Kagoshima, Japan; rayjun{at}post1.miyazaki-med.ac.jp

Tsuyomu Ikenoue, MD

Masato Kamitomo, MD

Hiroshi Sakamoto, DVM

Perinatal Center and Department of Obstetrics and Gynecology, Miyazaki Medical College, Miyazaki; the Department of Obsterics and Gynecology, Kagoshima City Hospital, Kagoshima; the Department of Veterinary Medicine, Kagoshima University, Kagoshima, Japan

Objective: To determine if fetal heart rate (FHR) decelerations peridically occur with uterine contractures during 6 hours' induced hypoxemia in goats.

Methods: In five chronically catherized goat fetuses at 125-130 days' gestation, incidence of FHR decelerations was compared between 6 hours' control time and 6 hours' induced hypoxemia with two-way ANOVA and Duncan's multiple range test. Three other fetuses were used as controls for circadian rhythm.

Results: Fetal Pao2 was significantly decreased from 26.1 to 16.3 mmHg without acidemia. During hypoxemia, 42 decelerations were induced along with 5 initial decelerations during the acute phase hypoxemia. Incidence of decelerations increased significantly from 0.07 ± 0.15 per hour in 6-hour controls to 1.40 ± 0.28 per hour during 6 hours' induced hypoxemia. Short-term variability and long-tern variability of the 42 decelerations were significantly increased. These variabilities were also increased during the 5 initial decelerations. Grequency of uterine contractures did not change during hypoxemia. There was an observable association of FHR deceleratious with uterine contractures during hypoxemia.

Conclusion: Fetal heart rate decelerations occurred periodically in association with uterine contracture during induced 6 hours' hypoxemia, which were characterized by show onset and recovery with increases in variability.

Key Words: Fetal heart rate deceleration • long-term hypoxemia • goat • variability • uterine contracture

Journal of the Society for Gynecologic Investigation, Vol. 5, No. 2, 75-80 (1998)
DOI: 10.1177/107155769800500205
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