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Non-invasive quantification of diaphragm kinetics using m-mode sonography
1Department of Ultrasound, Nîmes University Hospital, France. Biomed@zeus.sc.univ-montpl.fr
Summary
Standard spirometry alters diaphragm movement. M-mode sonography revealed increased diaphragm inspiratory amplitude and duty cycle during spirometry, indicating changes in breathing mechanics.
Area of Science:
- Pulmonary Physiology
- Diagnostic Imaging
Background:
- Standard spirometry involves wearing a nose clip and breathing through a mouthpiece, which may alter normal breathing patterns.
- Diaphragm kinetics play a crucial role in ventilation.
Purpose of the Study:
- To assess changes in diaphragm kinetics induced by standard spirometry conditions using M-mode sonography.
- To investigate the impact of spirometry apparatus on diaphragm movement during quiet breathing.
Main Methods:
- M-mode sonography of the right diaphragm was performed before and during spirometry.
- The study included eight healthy adult patients without respiratory disease.
Main Results:
- Spirometry significantly increased diaphragm inspiratory amplitude (P = 0.007) and inspiratory time (P = 0.015).
- The diaphragm duty cycle increased from 38% to 44% (P = 0.023).
- Diaphragm inspiratory and expiratory motion velocities also showed significant changes (P = 0.007).
Conclusions:
- M-mode sonography effectively demonstrated measurable changes in diaphragm kinetics due to spirometry.
- Spirometry conditions, including nose clips and mouthpieces, alter diaphragm movement patterns.