Myringosclerosis after tympanostomy tube insertion: relation with tube retention time and gender

To determine relationship between myringosclerosis and tube retention time and sex in children with chronic otitis media with effusion who were treated with tympanostomy tube insertion. Also, the relationship between myringosclerosis both sex and initial age of tube insertion were investigated.

A total of 101 children (195 ears) were reviewed. Ears were divided into four groups according to retention time of tympanostomy tubes. Group I: Retention time of tympanostomy tube less than 6 months. Group II: Retention time of tympanostomy tube from 6 months to 12 months. Group III: Retention time of tympanostomy tube of 12 months or more. Group IV: Myringotomy group without tympanostomy tube insertion.

The order of the myringosclerosis rates were as follows from the highest to lowest one; group III (44.1%), group II (42.4%), group I (14.3%), and group IV (7.7%). Myringosclerosis was more common in group I compared with group IV, but the difference was statistically not significant (p>0.05). There were no statistically significant differences in myringosclerosis rates between the group II and group III (p>0.05). On the other hand, statistically significant differences were observed in myringosclerosis rates between group I and group II (p<0.05), and between group I and group III (p<0.05); also similar significant differences were present in myringosclerosis rates between group IV and group II (p<0.05), and between group IV and group III (p<0.05). There was no significant difference between preschool age group and school age group. Myringosclerosis was observed in 40% of boys and in 51.2% of girls.

Myringosclerosis is frequent in patients who underwent tympanostomy tube insertion. The frequency of myringosclerosis is much higher in tympanic membranes with tympanostomy tube insertion than tympanic membranes with myringotomy, and the location of sclerotic plaques does not always correspond to the tympanostomy area. The myringosclerosis rate was increased when the tympanostomy tubes stay on tympanic membrane for a long time. Highest myringosclerosis rates were observed if the extrusion time was 12 months or longer. In our analysis, sex and initial age of tube insertion were not significant factors for the development of myringosclerosis after extrusion of tympanostomy tubes.