Early auditory middle latency evoked potentials correlates with recovery from aphasia after stroke.
OBJECTIVE
To assess the relationship between the latency of Pa and Nb peaks of the middle latency auditory responses and the score on the Boston Diagnostic Aphasia Examination, during a 6-month follow-up after stroke in the territory of the left mid cerebral artery.


METHODS
The middle latency auditory potentials of 10 aphasic stroke patients were recorded within the first 3 days post-onset, at the time of hospital discharge and 2, 4 and 6 months afterwards, along with that of 30 control subjects; in patients, the evolution of aphasia was evaluated using the Boston Diagnostic Aphasia Examination score.


RESULTS
During follow-up decreasing potential latencies and increasing language scores were observed (ANCOVA, R(2) 0.75, p<0.01); the Nb peak latency recorded during the first days after stroke was related to the language score difference after 6 months (Pearson, r=0.66, p<0.01).


CONCLUSIONS
In patients with aphasia after stroke, the auditory electrical response recorded at hospital discharge, after stroke is related to their recovery from aphasia, evaluated by the Boston Diagnostic Aphasia Examination.


CONCLUSIONS
Early middle latency auditory evoked responses may have a prognostic value in aphasic stroke patients.
Rojas Sosa
M C
MC
Unidad de Medicina Física y Rehabilitación siglo XXI, Instituto Mexicano del Seguro Social, Mexico D.F.
Fraire Martínez
M I
MI
Olvera Gómez
J L
JL
Jáuregui-Renaud
K
K
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D000704:Analysis of Variance; D001037:Aphasia / Q000209:etiology*; D004569:Electroencephalography / Q000379:methods; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011930:Reaction Time / Q000502:physiology*; D020127:Recovery of Function / Q000502:physiology*; D020521:Stroke / Q000150:complications*; D013997:Time Factors