Type A- Normal tympanogram

Type As- Compliance lower, seen in fixation of ossicles eg:Otosclerosis,malleus fixation

Type Ad- High compliance,Seen in ossicular discontinuity and lax tympanic membrane

Type B- Flat dome shaped graph.No change in compliance.Seen in middle ear fluid/thick tympanic membrane.

Type C- Maximum compliance with negative pressure in excess of 100mmHg.Seen in retracted tympanic membrane and minimal fluid in middle ear.

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