Acute flaccid paralysis: the spectrum of a newly recognized complication of West Nile virus infection.
OBJECTIVE
Acute flaccid paralysis (AFP) has recently emerged as a major central nervous system complication associated with West Nile virus (WNV) infection. The spectrum of clinical presentations of AFP in WNV infection and its sequelae have not been well-studied.


METHODS
We describe three patients with AFP due to WNV infection and review the clinical presentations of 56 patients with this complication derived from published studies.


RESULTS
Patients with AFP and WNV presented with a spectrum of illness ranging from single extremity paralysis to quadriparalysis with cranial nerve involvement. Patients commonly developed respiratory failure (54%) and bladder dysfunction (22%). While fever was nearly universal (92%), signs of meningismus were less common (17%). Cerebrospinal fluid (CSF) analysis generally revealed a modest pleocytosis, and imaging studies were not diagnositic. Persistent neurologic impairment occurred in all survivors; overall mortality rate was high (22%) and was associated with both the extent of paralysis and advanced age.


CONCLUSIONS
AFP in the setting of WNV is associated with significant mortality and long-term morbidity.
Saad
Mustafa
M
Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Medical Service, James H. Quillen VAMC, Mountainhome, Box 70622, Johnson City, TN 37614, USA.
Youssef
Souad
S
Kirschke
David
D
Shubair
Mohammed
M
Haddadin
Dafer
D
Myers
James
J
Moorman
Jonathan
J
D000368:Aged; D000914:Antibodies, Viral / Q000097:blood; D006801:Humans; D008297:Male; D008875:Middle Aged; D009123:Muscle Hypotonia / Q000209:etiology; D010243:Paralysis / Q000209:etiology*; D011379:Prognosis; D011782:Quadriplegia / Q000209:etiology; D014901:West Nile Fever / Q000150:complications* / Q000175:diagnosis; D014902:West Nile virus / Q000276:immunology
D000914:Antibodies, Viral