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Mechanical coupling between the hemithoraces in humans

B Johansen1, P Giaever, F Aspestrand

  • 1Dept of Thoracic Medicine, University of Oslo, Norway.

The European Respiratory Journal
|January 1, 1996
PubMed
Summary
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Unilateral airway occlusion reveals interdependence between lung hemithoraces. The occluded lung restricts contralateral movement, but this coupling ensures ventilation, benefiting overall chest function.

Area of Science:

  • Respiratory Physiology
  • Thoracic Biomechanics

Background:

  • Unilateral airway occlusion is used to assess single lung function.
  • Previous findings suggest the occluded lung impacts contralateral hemithorax mobility.

Purpose of the Study:

  • To investigate the interdependence of hemithorax movement during unilateral airway occlusion.
  • To quantify the effect of occluded lung on contralateral lung and rib cage motion.

Main Methods:

  • Computed tomography (CT) was used in eight healthy subjects.
  • Measurements included lung parenchymal area and rib cage diameters at maximal inspiration and expiration.
  • These were recorded with and without mainstem bronchus occlusion at residual volume (RV) and total lung capacity (TLC).

Main Results:

Related Experiment Videos

  • Unilateral occlusion reduced ipsilateral and contralateral hemithorax motion during inspiration and expiration.
  • The occluded lung's parenchymal area showed minimal change, while the contralateral lung area was 86-97% of baseline.
  • Despite reduced motion, significant inspiratory/expiratory changes occurred in both lungs.

Conclusions:

  • Hemithorax movements are interdependent, with the occluded side limiting contralateral motion.
  • This interdependence may ensure ventilation to the non-occluded lung, outweighing potential negative effects.
  • The mechanism secures ventilation to a hemithorax lacking its own movement.