الفهرس 
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Abstract
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§ummary: //
In the present study, ”(26patients( undergoing open heart surgery were subjected
to audiological evaluation pre and POStopenltively to study the effect of
such operations on bearing and to explain the possible aetiology of occasional
sudden hCarlng loss reported by others. Three groups we•re .developed, those
with no loss (10 patients) , those with non singificant changes (11 patients) and
those with average bearing defficit of 10 dB ( 2 pati~ ) . In all cases the
changes occured bilaterally.
Embolism seems to be unlikely aetiology of such hearing loss as all patients
in our series were young with no arterioscIerotic cerebrovasular disease and
bearing loss occlUed ~ralby. bi ~QttYA\lr ,,
The perfusion failure theory seems to be a POssible exp~on of bearing
loss as in all cases the affection was bilateraL However ototoxic drogs can not
be excluded as a possible cause.