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Updated: Aug 15, 2026
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Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
Published on: May 25, 2015
Bilateral isolated phrenic neuropathy causing painless bilateral diaphragmatic paralysis
P T Lin1, P-B Andersson, B J Distad
1Department of Neurology, Stanford University, Stanford, CA 94305, USA. perlin@leland.stanford.edu
Neurology
|November 9, 2005
Summary
Painless bilateral isolated phrenic neuropathy causes diaphragmatic paralysis. This condition, affecting only the diaphragm, shows poor long-term recovery and is distinct from other neuromuscular disorders.
Area of Science:
- Neurology
- Diaphragmatic Disorders
Background:
- Neuromuscular disorders can present with diaphragmatic dysfunction.
- Differentiating causes of diaphragmatic paralysis is crucial for accurate diagnosis and management.
Observation:
- Four patients presented with a syndrome of painless, bilateral, isolated phrenic neuropathy.
- Electrophysiologic testing revealed active denervation exclusively in the diaphragm.
Findings:
- Bilateral isolated phrenic neuropathy is a distinct clinical entity.
- The condition is characterized by painless diaphragmatic paralysis.
- Long-term recovery from this neuropathy is generally poor.
Implications:
- This syndrome should be considered in the differential diagnosis of unexplained diaphragmatic paralysis.
- Distinguishing this neuropathy from immune brachial plexus neuropathy and other neuromuscular conditions is essential.
- Further research is needed to understand the etiology and optimize treatment for isolated phrenic neuropathy.
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