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Neurology 2003-Jul

West Nile virus infection: a new acute paralytic illness.

Watumiaji waliosajiliwa tu ndio wanaweza kutafsiri nakala
Ingia / Ingia
Kiungo kimehifadhiwa kwenye clipboard
L E Jeha
C A Sila
R J Lederman
R A Prayson
C M Isada
S M Gordon

Maneno muhimu

Kikemikali

OBJECTIVE

To determine the clinical, laboratory, electrodiagnostic, radiologic, and pathologic characteristics that define the spectrum of CNS disease caused by West Nile virus (WNV) infection.

METHODS

The records of all patients hospitalized at the Cleveland Clinic from August 2002 to September 2002 with WNV infection were reviewed.

RESULTS

Of 23 cases, the median age was 74 years old, and 74% were men. Symptoms included fever (100%), altered mental status (74%), gastrointestinal complaints (43%), back pain (35%), and rash (26%). In half, meningitis or encephalitis overlapped with flaccid weakness that progressed over 3 to 8 days, with a tendency to be proximal and asymmetric. Laboratory abnormalities included hyponatremia (30%) and initial CSF neutrophilic pleocytosis. Electrodiagnostic studies in two patients showed reduced motor amplitudes with normal conduction velocities and active denervation. In two other patients, reduced sensory amplitudes were also seen. MRI changes included cauda equina enhancement and parenchymal spinal cord signal abnormalities and parenchymal or leptomeningeal signal changes in the brain. Autopsy in three cases showed chronic perivascular inflammation in the brain and inflammatory changes with anterior horn cell loss in the spinal cord.

CONCLUSIONS

An overlapping spectrum of meningitis, encephalitis, and myeloradiculitis occurs in CNS WNV infection. Fever, rash, abdominal and back pain, preceding a proximal, asymmetric flaccid weakness, with CSF pleocytosis help distinguish the motor syndrome from Guillain-Barré syndrome. Pathologic changes in the CNS resembled poliomyelitis.

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