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Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
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Insidious phrenic nerve involvement in postpolio syndrome

Tomihiro Imai1, Hiroyuki Matsumoto

  • 1Department of Neurology, Sapporo Medical University School of Medicine.

Internal Medicine (Tokyo, Japan)
|May 17, 2006
PubMed

A 49-year-old woman with amyotrophic sequelae of poliomyelitis experienced progressive left upper limb weakness and breathing discomfort while walking that had developed over one year prior to presentation. She had flaccid quadriplegia which was more marked in the left upper limb, with the C4- and C5-innervated muscles being most severely affected. Chest radiographs double exposed at maximal inspiration and expiration revealed poor respiratory movements in the left hemidiaphragm. Phrenic nerve conduction study demonstrated conspicuous diaphragmatic paralysis on the left side. The electrophysiological study supports radiological findings and provides useful evidence for insidious phrenic nerve involvement in postpolio syndrome.

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