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Updated: Aug 4, 2026
07:12
Diagnostic Ultrasound Imaging of Mouse Diaphragm Function
Published on: April 21, 2014
In vivo regional diaphragm function in dogs
J Sprung1, C Deschamps, R D Hubmayr
1Division of Thoracic Diseases and Internal Medicine, Mayo Clinic, Rochester, Minnesota.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1989
Summary
Diaphragm muscle shortening varies regionally and differs between spontaneous breathing and mechanical ventilation. Spontaneous breathing generally shows greater regional shortening than mechanical ventilation, except in the ventral costal diaphragm.
Area of Science:
- Physiology
- Biomechanics
Background:
- The diaphragm is a primary muscle of respiration.
- Understanding regional diaphragm mechanics is crucial for respiratory physiology.
Purpose of the Study:
- To investigate regional shortening of the canine diaphragm during spontaneous breathing and mechanical ventilation.
- To compare diaphragm mechanics between different breathing methods.
Main Methods:
- A biplane videofluorographic system tracked metallic markers on the hemidiaphragm in anesthetized dogs.
- Regional shortening was calculated from intermarker distances along muscle bundles in costal and crural regions.
Main Results:
- Significant regional variability in diaphragm shortening was observed within rows.
- Diaphragm shortening patterns differed between spontaneous breathing and mechanical ventilation.
- Most diaphragm regions shortened more during spontaneous breathing than mechanical ventilation at equal tidal volumes.
Conclusions:
- Regional diaphragm mechanics exhibit considerable variability.
- Breathing method significantly influences diaphragm shortening patterns.
- Spontaneous breathing promotes greater diaphragm muscle activation compared to mechanical ventilation.
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