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• W2003173509 endingPage "R1179" @default.
• W2003173509 startingPage "R1171" @default.
• W2003173509 abstract "In midsystole, fetal pulmonary trunk (PT) and arterial (PA) blood flows characteristically fall, despite pulmonary blood pressure increasing, while ductus arteriosus (DA) flow continues to rise to a delayed peak. Wave intensity ( WI) analysis indicates that midsystolic fetal PT and PA flow reductions are related to a very large midsystolic PA backward-running compression wave (BCW ms ), which originates in the pulmonary microvasculature and is partially transmitted into the PT. This study tested the hypothesis that midsystolic augmentation of DA blood flow was related to transmission of the PA BCW ms into the DA. DA, PT, and PA WI analysis was performed in eight anesthetized late-gestation fetal sheep instrumented with DA, PT, and left PA micromanometer catheters to measure pressure (P) and transit-time flow probes to obtain blood velocity ( U). In a subgroup ( n = 5), the main PA was briefly occluded to abolish wave transmission from the lungs. WI was calculated as the product of P and U rates of change. PA and PT WI profiles both contained a prominent BCW ms , ∼5-fold larger in the PA ( P < 0.005), which increased P but decreased U. By contrast, the DA WI profile demonstrated a large midsystolic forward-running compression wave (FCW ms ), which increased DA P and U, and occurred 5 ms after PA BCW ms . Furthermore, both DA FCW ms and PT BCW ms were abolished by main PA occlusion. These results suggest that the fetal PA BCW ms undergoes retrograde transmission into the PT as a BCW ms , but antegrade transmission into the DA as a FCW ms that augments midsystolic DA flow." @default.
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• W2003173509 date "2009-10-01" @default.
• W2003173509 modified "2023-09-27" @default.
• W2003173509 title "Ductus arteriosus wave intensity analysis in fetal lambs: midsystolic ductal flow augmentation is due to antegrade pulmonary arterial wave transmission" @default.
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• W2003173509 doi "https://doi.org/10.1152/ajpregu.00384.2009" @default.
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