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Methods for averaging irregular respiratory flow profiles in awake humans.
1Department of Anesthesiology, Chiba University School of Medicine, Chiba 260, Japan.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 13, 2001
Summary
This study introduces a novel method for analyzing respiratory flow profiles by aligning breaths using the respiratory cycle phase. This approach minimizes distortions, providing more accurate typical respiratory flow patterns.
Area of Science:
- Physiology
- Respiratory System Mechanics
- Data Analysis
Background:
- Respiratory flow profiles are key outputs of the respiratory controller.
- Previous methods for averaging flow profiles are distorted by breath variability.
- Time-domain alignment of breaths is susceptible to significant distortions.
Purpose of the Study:
- To develop a robust method for determining typical respiratory flow profiles.
- To overcome distortions caused by breath-to-breath variability.
- To improve the accuracy of respiratory flow analysis.
Main Methods:
- Developed a phase-alignment method using the normalized flow-volume diagram.
- Defined respiratory cycle phase as an angle on the phase-plane plot.
- Calculated median flow, volume, and time at each phase angle, followed by mass balance adjustment.
Main Results:
- The phase-alignment method produced typical flow profiles.
- These profiles showed characteristics closer to mean individual cycle values.
- Outperformed the Benchetrit and co-workers' Fourier coefficient method.
Conclusions:
- Phase alignment is a superior method for deriving typical respiratory flow profiles.
- This technique accurately represents respiratory controller output.
- Minimizes distortions inherent in previous averaging methods.