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- W2464157785 abstract "In the mammalian fetus the ductus arteriosus allows right ventricular output to be shunted away from the lungs to the systemic circulation. This study was performed to determine how closing the ductus arteriosus of the fetal sheep would affect the pulmonary circulation. Under halothane anaesthesia 6 near-term fetal sheep were delivered with the umbilical circulation intact. Catheters were placed in the right atrium, the pulmonary artery, and the aorta. Pulmonary blood flow was measured by injecting radioactive microspheres into the right atrium while a reference sample was withdrawn from the pulmonary artery. Closing the ductus arteriosus increased pulmonary arterial pressure by 22% from 51 +/- 3 to 62 +/- 3 mmHg and increased pulmonary blood flow disproportionately by 198% from 232 +/- 74 to 692 +/- 80 ml/min per 100g. Thus, pulmonary vascular resistance decreased by 75% from 0.451 +/- 0.65 to 0.095 +/- 0.010 mmHg 100g min/ml. These findings extend the observation that pressure and flow in the pulmonary circulation of the air-breathing lung do not have a linear relationship passing through the origin to include a striking example in the fluid-filled lung of the intact fetus. They also raise questions about the nature of the elevated vascular resistance in the fetal lung." @default.
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- W2464157785 date "1989-05-01" @default.
- W2464157785 modified "2023-09-23" @default.
- W2464157785 title "The effect of closing the ductus arteriosus on the pulmonary circulation of the fetal sheep." @default.
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