SNHL a/s with physiological aging process of ear

Usually manifest at age of 65 y/o

Characterized by degeneration of the organ of corti,starting at basal coil and progress to apex

Higher frequencies affected but speech discrimination remains good

characterized by degeneration of cells of spiral ganglion,start at basal coil and progressing to apex

Neurons of higher auditory pathways may also be affected

High tone loss but speech discrimination is poor and out of proportion to the pure tone loss

stiffering of basilar membrane thus affecting its movement

audiogram is sloping type

Signs and symptoms

Management

Characterized by atropy of stria vascularis

Audiogram is flat but speech discrimination is good