Comparison of visual evoked potentials in patients with psychogenic visual disturbance and malingering.
J Pediatr Ophthalmol Strabismus
; 38(1): 21-6, 2001.
Article
en En
| MEDLINE
| ID: mdl-11201913
ABSTRACT
PURPOSE:
To verify the efficiency and objectivity of the pattern visual evoked potential (VEP) for organic disorders of the cortical visual system.METHODS:
This retrospective study evaluated VEP in 19 patients diagnosed with psychogenic visual disturbance, 7 patients with malingering, and 37 age-matched normal volunteers. Transient (3 reversals per second) and steady-state (12 reversals per second) pattern VEPs for check sizes 15' and 30', with a contrast of 80%, were recorded.RESULTS:
The amplitudes of both transient and steady-state pattern VEPs were significantly increased in patients with psychogenic visual disturbance, while patients with malingering had significantly lower amplitudes. P100 peak latency was prolonged in both groups of patients.CONCLUSION:
Monitoring of patients' fixation on the stimulus showed those with psychogenic visual disturbance fixated well on the stimulus, while those with malingering did not. This finding produced a VEP amplitude reduction in patients with malingering. The reason for the VEP amplitude in patients with psychogenic visual disturbance is unclear.
Buscar en Google
Base de datos:
MEDLINE
Asunto principal:
Trastornos Psicofisiológicos
/
Trastornos de la Visión
/
Potenciales Evocados Visuales
/
Simulación de Enfermedad
Tipo de estudio:
Diagnostic_studies
/
Etiology_studies
/
Observational_studies
/
Risk_factors_studies
Idioma:
En
Revista:
J Pediatr Ophthalmol Strabismus
Año:
2001
Tipo del documento:
Article