Pulmonary Artery Velocity Profiles in Young Lambs

by Belinda Ha, Univ of North Carolina, Chapel Hill, United States,
Hiroshi Katayama, Univ of North Carolina, Chapel Hill, United States,
Robert Krzeski, Univ of North Carolina, Chapel Hill, United States,
Carol L. Lucas, Univ of North Carolina, Chapel Hill, United States,
G. William Henry, Univ of North Carolina, Chapel Hill, United States,
Patricia Lynch, Univ of North Carolina, Chapel Hill, United States,
Ajit P. Yoganathan, Univ of North Carolina, Chapel Hill, United States,
Jose I. Ferreiro, Univ of North Carolina, Chapel Hill, United States,
Benson R. Wilcox, Univ of North Carolina, Chapel Hill, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract: This report describes progress made in our laboratory in examining pulmonary artery velocity patterns in normally maturing lambs. Lambs from four age groups were selected for study--2 days, 1 week, 2 weeks, and 4 weeks. Using an intraluminal 20 MHz pulsed Doppler probe, pulmonary blood velocity was measured at 2 mm intervals across the posterior-anterior and right-left axes, from which 2-dimensional instantaneous velocity profiles were reconstructed. Preliminary computations indicate marked interanimal variability in all groups. Qualitative comparisons of envelope velocity profiles indicate that reverse flow was observed in all groups. Maximal backflow tended to be localized near the walls in the 2 day old group; in the other groups, prominent backflow was observed in the posterior half of the vessel.

Subject Headings: Velocity profile | Fluid flow | Flow profiles | Aging (material) | Doppler systems | Probe instruments

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