title: Factors affecting the extrusion rates of ventilation tubes.
abstract: A survey in which 939 ventilation tubes of 8 different patterns were inserted and reviewed (up to a maximum of 2 1/4 years) is analysed. Various factors determining the rate of extrusion are discussed. The Sheehy Collar Button tube remained functional for a longer period than any of the other tubes included in the survey.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001299:Audiometry; D002648:Child; D004867:Equipment Design; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008876:Middle Ear Ventilation / Q000295:instrumentation*; D010034:Otitis Media with Effusion / Q000628:therapy; D011446:Prospective Studies