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Diaphragmatic weakness and paralysis.

P G Wilcox1, R L Pardy

  • 1Respiratory Division, University of British Columbia Health Sciences Centre Hospital, Vancouver, Canada.

Lung
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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Diaphragmatic weakness, often unrecognized, stems from phrenic nerve or diaphragm muscle diseases. Diagnosis involves specific pressure measurements, aiding in identifying causes like neuropathy or myopathy.

Area of Science:

  • Pulmonology
  • Neurology
  • Myology

Background:

  • Diaphragmatic weakness, a decrease in diaphragm strength, can lead to paralysis.
  • It is often unrecognized due to a lack of appropriate diagnostic testing.
  • Causes can originate anywhere along the neuromuscular axis, commonly involving phrenic nerves or diaphragm myopathies.

Purpose of the Study:

  • To review the causes and diagnostic approaches for diaphragmatic weakness and paralysis.
  • To outline a systematic method for identifying the specific etiology of diaphragmatic dysfunction.
  • To emphasize the importance of recognizing and diagnosing diaphragmatic weakness.

Main Methods:

  • Clinical suspicion based on symptoms (dyspnea, orthopnea) and physical findings (paradoxical breathing).

Related Experiment Videos

  • Diagnostic tools include lung function testing, imaging (radiography, fluoroscopy), and pressure measurements.
  • Confirmation of diaphragmatic weakness via reduced maximal static transdiaphragmatic pressure (Pdimax); paralysis via absent phrenic nerve action potential.

    • Main Results:

    • Diaphragmatic weakness can be suspected through various clinical and functional tests.
    • Maximal static transdiaphragmatic pressure (Pdimax) reduction confirms weakness.
    • Phrenic nerve stimulation helps confirm paralysis by assessing diaphragm action potential.

    Conclusions:

    • Diaphragmatic weakness and paralysis have diverse causes, frequently linked to phrenic neuropathy or myopathy.
    • Investigating other affected nerves/muscles can help identify the underlying pathology.
    • A structured diagnostic approach is crucial for determining the specific cause of diaphragmatic dysfunction.