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Developmental changes in flow-wave propagation velocity in embryonic chick vascular system
M Yoshigi1, J M Ettel, B B Keller
1Strong Children's Research Center, Department of Pediatrics, University of Rochester School of Medicine and Dentistry, New York 14642, USA.
The American Journal of Physiology
|October 10, 1997
Summary
Embryonic blood flow wave velocity increases significantly during development. This wave propagation velocity correlates with vascular system growth and arterial wall elasticity.
Area of Science:
- Cardiovascular Physiology
- Developmental Biology
- Biophysics
Background:
- Early embryonic development involves complex cardiovascular system formation.
- Understanding blood flow dynamics is crucial for studying embryonic development.
Purpose of the Study:
- To analyze flow-wave propagation velocity in early embryonic arterial systems.
- To investigate the response of wave propagation velocity to acute changes in blood volume.
Main Methods:
- Utilized pulsed Doppler velocimetry (20-MHz) in chick embryos at stages 18, 21, and 24.
- Measured inter-site distances via video-microscopy.
- Calculated phase velocity using Fourier transform and wave-front velocity via threshold technique.
Main Results:
- Mean phase velocity increased from 42.9 cm/s (stage 18) to 95.8 cm/s (stage 24).
- Wave-front velocity increased from 52.8 cm/s (stage 18) to 72.2 cm/s (stage 24).
- Velocity changes correlated with stroke volume and mean aortic pressure during development and volume alterations.
Conclusions:
- Developmental increases in wave propagation velocity are linked to vascular system expansion and arterial wall properties.
- Embryonic wave propagation velocity is sensitive to changes in circulating blood volume and stroke volume.