Which observation would most suggest Eustachian tube dysfunction as the cause of conductive hearing loss in a patient with cleft lip/palate?

Which observation would most suggest Eustachian tube dysfunction as the cause of conductive hearing loss in a patient with cleft lip/palate?

• A. Normal tympanometry
• B. Negative middle-ear pressure
• C. Normal audiogram
• D. Presence of otoacoustic emissions

Answer: (B)

Eustachian tube dysfunction leads to trouble equalizing middle-ear pressure, so the middle ear sits at negative pressure. In someone with cleft lip/palate, this dysfunction is common because the tensor veli palatini muscle struggles to open the tube. That negative middle-ear pressure pulls the tympanic membrane inward and reduces its mobility, producing conductive hearing loss. Tympanometry directly assesses middle-ear pressure and membrane movement, so finding negative middle-ear pressure (often seen as a Type C tympanogram) is the clearest sign that ETD is driving the conductive loss. Other observations don’t point to ETD as strongly: a normal tympanogram would argue against ETD, a normal audiogram suggests no conductive loss, and otoacoustic emissions reflect cochlear outer hair cell function rather than middle-ear status.

Eustachian tube dysfunction leads to trouble equalizing middle-ear pressure, so the middle ear sits at negative pressure. In someone with cleft lip/palate, this dysfunction is common because the tensor veli palatini muscle struggles to open the tube. That negative middle-ear pressure pulls the tympanic membrane inward and reduces its mobility, producing conductive hearing loss. Tympanometry directly assesses middle-ear pressure and membrane movement, so finding negative middle-ear pressure (often seen as a Type C tympanogram) is the clearest sign that ETD is driving the conductive loss. Other observations don’t point to ETD as strongly: a normal tympanogram would argue against ETD, a normal audiogram suggests no conductive loss, and otoacoustic emissions reflect cochlear outer hair cell function rather than middle-ear status.