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Osteoarthrosis causing altered mental status: a case report.

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Summary
This summary is machine-generated.

Cervical spondylosis can cause diaphragmatic weakness and respiratory failure by compressing the phrenic nerve. This rare condition requires consideration in elderly patients with chronic hypoventilation.

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Area of Science:

  • Neurology
  • Pulmonology
  • Geriatrics

Background:

  • Cervical spondylosis typically causes respiratory issues via cervical myelopathy.
  • Phrenic nerve involvement from cervical spondylosis is uncommon, usually linked to spinal cord compression.

Observation:

  • An 87-year-old man presented with recurrent hypercapnic respiratory failure and altered mental status.
  • Neurological deficits included C5 radiculopathy; workup revealed phrenic neuropathy due to C3-C5 foraminal narrowing from cervical spondylosis.
  • Pulmonary function tests showed restrictive lung mechanics and low respiratory pressures.

Findings:

  • Cervical spondylosis can cause phrenic nerve root compression leading to lower motor neuron paralysis.
  • This resulted in respiratory failure in the absence of direct spinal cord involvement.
  • Normal alveolar-arterial oxygen gradient indicated hypoventilation as the cause.

Implications:

  • Phrenic nerve compression by cervical spondylosis is a rare cause of chronic respiratory acidosis.
  • Consider this diagnosis in elderly patients with unexplained chronic hypoventilation.
  • Arterial blood gas analysis is crucial for diagnosing hypoventilation causes.