Affiliation:
1. Department of Medicine, Baylor College of Medicine, Houston, Texas 77030.
Abstract
The curvature of the midcostal region of the diaphragm in seven dogs was determined at functional residual capacity (FRC) and end inspiration during spontaneous breathing and mechanical ventilation and at total lung capacity in the prone and supine positions. Metallic markers were attached to muscle fibers on the abdominal surface of the diaphragm, and the dog was allowed to recover from surgery. The three-dimensional positions of the markers were determined by biplane videofluoroscopy. A quadratic surface was fit to the bead positions. The principal axes of the quadratic surface lie nearly along and perpendicular to the muscle fibers. In both the supine and prone positions, the values of the principal curvatures were similar at FRC and end inspiration during spontaneous breathing, when muscle tension and transdiaphragmatic pressure both increase with increasing lung volume, and during mechanical ventilation and passive inflation to total lung capacity, when both decrease relative to their magnitude at FRC. No abrupt change of curvature, which might be expected at the edge of the zone of apposition, was apparent. The curvature along the muscle fiber was 0.35 +/- 0.07 cm-1; the curvature perpendicular to the muscle fiber was much smaller, 0.06 +/- 0.01 cm-1. The costal region of the diaphragm displaces and shortens as lung volume increases, but its shape, as described by its curvatures, does not change substantially.
Publisher
American Physiological Society
Subject
Physiology (medical),Physiology
Cited by
27 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Methods of Lung Segmentation Based on CT Images;Advanced Healthcare Systems;2022-01-29
2. Automatic Lung Segmentation With Juxta-Pleural Nodule Identification Using Active Contour Model and Bayesian Approach;IEEE Journal of Translational Engineering in Health and Medicine;2018
3. Obesity modulates diaphragm curvature in subjects with and without COPD;American Journal of Physiology-Regulatory, Integrative and Comparative Physiology;2017-11-01
4. Regional diaphragm volume displacement is heterogeneous in dogs;American Journal of Physiology-Regulatory, Integrative and Comparative Physiology;2017-03-01
5. The Chest Wall and the Respiratory Pump;SpringerBriefs in Bioengineering;2016