Hearing loss in infants born with a cleft palate is usually related to which of the following?

• A. Cochlear dysfunction
• B. Inability to create positive pressure in the oral cavity
• C. Eustachian tube dysfunction
• D. Malformation of the middle-ear ossicles

Answer: (C)

Eustachian tube dysfunction is the key idea. In infants with a cleft palate, the muscles that normally open the Eustachian tube don’t work as well because of the altered palate structure, so the middle ear can’t vent properly. This creates negative pressure in the middle ear and leads to fluid buildup (otitis media with effusion), which causes a conductive hearing loss. If the inner ear were the problem, or if the issue were about oral pressure, the pattern of hearing loss wouldn’t fit cleft palate cases as neatly. Malformations of the middle-ear bones are less commonly the cause here. So the usual link between cleft palate and hearing loss is this impaired middle-ear ventilation from Eustachian tube dysfunction.