Variante facial del síndrome de Guillain-Barré en un paciente, días después de vacunarse de la gripe A / Facial variant of Guillain-Barré Syndrome in a patient, days after being vaccinated for influenza A

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[Unilateral asterixis associated with anatomic cerebral lesions]. / Asterixis unilateral asociada a lesiones anatómicas cerebrales.

Three patients with unilateral asterixis associated with different vascular lesions of thalamus, basal ganglia and internal and external capsules of contralateral hemisphere are described. Unilateral asterixis is a highly indicative sign of focal cerebral lesion. Its pathophysiology is still unknown. It has been postulated that asterixis is a myoclonic phenomenon resulting from malfunction within neuronal circuits of central nervous system responsible for the active maintenance of posture.