Fluid Abnormalities Occur in the Chronically Cannulated Mid-Gestation but Not Late Gestation Ovine Fetus
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چکیده
منابع مشابه
Angiotensin II infusion in vivo does not modulate cortisol secretion in the late-gestation ovine fetus.
Maturation of the fetal adrenal gland is critical for the onset of ovine parturition. It has long been proposed that the fetal adrenal gland may be under inhibitory influences during late gestation. In vitro evidence has suggested that angiotensin II may be such an inhibitory factor and may help to prevent a premature increase in cortisol concentrations. The aim of this study was to test the ef...
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The effect of sustained moderate hypoxia on renal blood flow and renal function was studied in the ovine fetus (123-129 days). The experiments consisted of 48 h of isocapnic hypoxia, not resulting in acidemia, but sufficient to produce redistribution of blood flow in favor of the brain at the expense of the carcass. Hypoxemia was induced by maternal nitrogen inhalation. Fetal arterial O2 satura...
متن کاملLong-term hypoxia increases leptin receptors and plasma leptin concentrations in the late-gestation ovine fetus.
This study was designed to test the hypothesis that long-term hypoxia (LTH) increases fetal plasma leptin and fetal adipose or placental leptin expression and alters hypothalamic and adrenocortical leptin receptor (OB-R) expression. Pregnant ewes were maintained at high altitude (3,820 m) from day 30 to approximately 130 days of gestation. Reduced Po2 was maintained in the laboratory by nitroge...
متن کاملPulmonary vascular effects of serotonin and selective serotonin reuptake inhibitors in the late-gestation ovine fetus.
Maternal use of selective serotonin (5-HT) reuptake inhibitors (SSRIs) is associated with an increased risk for persistent pulmonary hypertension of the newborn (PPHN), but little is known about 5-HT signaling in the developing lung. We hypothesize that 5-HT plays a key role in maintaining high pulmonary vascular resistance (PVR) in the fetus and that fetal exposure to SSRIs increases 5-HT acti...
متن کاملKetamine Attenuates the ACTH Response to Hypoxia in Late-Gestation Ovine Fetus.
BACKGROUND Ketamine, a noncompetitive N-Methyl-D-aspartate (NMDA) receptor antagonist, is a commonly used dissociative anesthetic in neonatology. We have proposed that ketamine reduces fetal stress responsiveness to stimuli that involve reduced oxygen supply to the fetal brain. Previously, we have shown that ketamine inhibits plasma ACTH levels in late-gestation fetal sheep subjected to brachio...
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ژورنال
عنوان ژورنال: Pediatric Research
سال: 1998
ISSN: 0031-3998,1530-0447
DOI: 10.1203/00006450-199812000-00012