Effects of nitric oxide and prostacyclin on hemodynamic response by big endothelin-1 in near term fetal sheep
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Toshiaki Okawa
, Shinya Honda , Minoru Sanpei , Tomohiko Ishida , Keiya Fujimori and Akira Sato
Abstract
Aims: To measure plasma concentrations of endothelin (ET)-1, NO metabolites (nitrate/nitrite; NOx) and 6-keto PGF1α (PGF1α) in maternal and fetal sheep blood, and to evaluate the effects of big ET-1 on hemodynamic response, blood gases and NO and 6-keto PGF1α production in near term fetal sheep.
Methods: Hemodynamic parameters were measured during infusion of big ET-1 into the carotid vein in chronically catheterized fetal sheep on day 125 of gestation. Fetal arterial blood samples were obtained for ET-1, PGF1α) and nitrate/nitrite (NOx) measurements.
Results: ET-1, NOx and PGF1α plasma concentrations were all significantly higher in fetal compared with the maternal plasma. Big ET-1 significantly decreased fetal systolic and diastolic blood pressure and significantly increased fetal heart rate. Big ET-1 stimulated plasma PGF1α), but not NOx, concentration.
Conclusions: Circulatory regulating factors in the fetus were up-regulated. The effects of ET-1 on fetal hemodynamic respnse may be mediated via prostacyclin, but not via the NO pathway.
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© Walter de Gruyter
Articles in the same Issue
- Author Index
- Subject Index
- Contents
- Difficult delivery of the impacted fetal head during cesarean section: intraoperative disengagement dystocia
- Breech presenting twin A: is vaginal delivery safe?
- Maternal serum interleukin-1β, -6 and -8 levels and potential determinants in pregnancy and peripartum
- Comparison between HELLP syndrome, chronic hypertension, and superimposed preeclampsia on chronic hypertension without HELLP syndrome
- Fetal scalp pH and ST analysis of the fetal ECG as an adjunct to CTG. A multi-center, observational study
- Effects of nitric oxide and prostacyclin on hemodynamic response by big endothelin-1 in near term fetal sheep
- Strategy for management of newborns with cervical teratoma
- Predicting neonatal outcomes: birthweight, body mass index or ponderal index?
- Markers of platelets activation, CD 62P and soluble P-selectin in healthy term neonates
- Detection of parvovirus B19, cytomegalovirus and enterovirus infections in cases of intrauterine fetal death
- Plasma endothelin-1 and clinical manifestations of neonatal sepsis
- Noncompaction of the left ventricular myocardium diagnosed in pregnant woman and neonate
- Ventricular bigeminy misdiagnosed as fetal bradycardia by cardiotocography – the value of non-invasive fetal electrocardiography
- Prolonged fetal bradycardia as the presenting clinical sign in Streptococcus agalactiae chorioamnionitis
- Changes of blood pressure and heart rate variability precede a grand mal seizure in a pregnant woman
- Myocardial infarction in early pregnancy
- The baby and the bathwater – a comment
- Reply to the opinion paper “The baby or the bathwater: which one should be discarded?”
Articles in the same Issue
- Author Index
- Subject Index
- Contents
- Difficult delivery of the impacted fetal head during cesarean section: intraoperative disengagement dystocia
- Breech presenting twin A: is vaginal delivery safe?
- Maternal serum interleukin-1β, -6 and -8 levels and potential determinants in pregnancy and peripartum
- Comparison between HELLP syndrome, chronic hypertension, and superimposed preeclampsia on chronic hypertension without HELLP syndrome
- Fetal scalp pH and ST analysis of the fetal ECG as an adjunct to CTG. A multi-center, observational study
- Effects of nitric oxide and prostacyclin on hemodynamic response by big endothelin-1 in near term fetal sheep
- Strategy for management of newborns with cervical teratoma
- Predicting neonatal outcomes: birthweight, body mass index or ponderal index?
- Markers of platelets activation, CD 62P and soluble P-selectin in healthy term neonates
- Detection of parvovirus B19, cytomegalovirus and enterovirus infections in cases of intrauterine fetal death
- Plasma endothelin-1 and clinical manifestations of neonatal sepsis
- Noncompaction of the left ventricular myocardium diagnosed in pregnant woman and neonate
- Ventricular bigeminy misdiagnosed as fetal bradycardia by cardiotocography – the value of non-invasive fetal electrocardiography
- Prolonged fetal bradycardia as the presenting clinical sign in Streptococcus agalactiae chorioamnionitis
- Changes of blood pressure and heart rate variability precede a grand mal seizure in a pregnant woman
- Myocardial infarction in early pregnancy
- The baby and the bathwater – a comment
- Reply to the opinion paper “The baby or the bathwater: which one should be discarded?”