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Related Experiment Videos

Human chest wall function during epidural anesthesia

D O Warner1, M A Warner, E L Ritman

  • 1Department of Anesthesiology, Mayo Clinic, Rochester, Minnesota 55905, USA.

Anesthesiology
|October 1, 1996
PubMed
Summary
This summary is machine-generated.

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Lumbar epidural anesthesia (EA) partially paralyzes chest wall muscles, reducing rib cage contribution to breathing. However, functional residual capacity increases due to diaphragm motion and decreased intrathoracic blood volume.

Area of Science:

  • Anesthesiology
  • Respiratory Physiology
  • Thoracic Surgery

Background:

  • Epidural anesthesia (EA) significantly impacts respiratory system function.
  • Limited data exists on EA's effects on respiratory muscles and chest wall motion.
  • This study investigates lumbar EA's impact on chest wall function during quiet breathing.

Purpose of the Study:

  • To determine the effects of lumbar epidural anesthesia on human chest wall function.
  • To assess changes in respiratory muscle activity and chest wall motion.
  • To understand the impact on functional residual capacity.

Main Methods:

  • Six participants were studied under mid-thoracic and high lumbar EA.
  • Respiratory muscle activity was measured using electromyography.

Related Experiment Videos

  • Chest wall configuration and functional residual capacity were assessed.

    • Main Results:

    • High EA abolished parasternal intercostal muscle activity but did not alter scalene muscle activity.
    • Rib cage expansion contribution to tidal volume decreased significantly.
    • Functional residual capacity increased due to diaphragm caudad motion and decreased intrathoracic blood volume.

    Conclusions:

    • Rib cage expansion still contributes to tidal volume during high EA.
    • Unblocked respiratory muscles like scalenes do not increase activity in response to EA-induced paralysis.
    • High EA increases functional residual capacity via diaphragm motion and reduced intrathoracic blood volume.