<qa>  What is done to improve hearing and speech development?A large number of children with otitis media undergo surgery with ventilation tubes VTs placed in the tympanic membrane. This is done to improve hearing and speech development and to reduce ear complaints. The long-term results of VTs are unclear. Follow-up care is required to assure that the tubes are functional, hearing loss has been corrected, and potential complications are properly diagnosed and managed. Guidelines regarding follow-up care give different advices concerning when, how and by whom the controls should be made. 