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Diaphragmatic microcirculation measured by laser-Doppler flowmetry in the rat
H Y Chang1, C R Chen, S N Hussain
1Department of Internal Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1995
Summary
Laser-Doppler flowmetry (LDF) offers a stable method for measuring regional diaphragmatic blood flow (Qdi) in rats. Despite spatial variations, LDF accurately reflects total Qdi, aiding microvascular research.
Area of Science:
- Physiology
- Biomedical Engineering
Background:
- Diaphragmatic blood flow is crucial for respiratory function.
- Accurate measurement of regional diaphragmatic perfusion is challenging.
Purpose of the Study:
- To evaluate laser-Doppler flowmetry (LDF) for measuring regional diaphragmatic blood flow (Qdi) in rats.
- To assess LDF's reliability concerning tissue perfusion, spatial variations, and correlation with total Qdi.
Main Methods:
- Anesthetized, mechanically ventilated rats were used.
- LDF measured Qdi from a 1 mm diameter, 0.5 mm depth area.
- Drugs were applied to the diaphragm surface during continuous Ringer solution suffusion.
Main Results:
- Resting Qdi and adenosine response were stable over 2 hours.
- Increasing adenosine concentrations progressively increased Qdi.
- Significant spatial variability in Qdi was observed across different sites.
- LDF signals indicated deep tissue penetration.
- Linear relationships between mean and total Qdi were significant but varied between animals.
Conclusions:
- LDF is a stable, continuous method for monitoring regional microvascular diaphragmatic perfusion.
- LDF's ability to reflect total Qdi is established, though site-specific variations exist.