Objective: To correlate the characteristics of type B tympanogram with the type of middle ear fluid in children suffering
from persistent OME. Methodology: A prospective study was conducted on children with persistent OME for more than
3 months who failed to respond to medical treatment with type B tympanogram in one or both ears, and were
candidate for myringotomy. The middle ear fluid was aspirated, and the viscosity of the fluid was evaluated objectively
by measuring the diameter of the diffusion circle on a filter paper in mm. Results: Thirty eight children (70 ears) were
enrolled in this study. The shape of type B tympanogram was either flat (67.14 %) or peaked (32.86 %).Three fluid
types were noticed in OME namely serous, mucoid and glue. The shape was highly correlated with the type of
secretions. Compliance and gradient of type B tympanogram were negatively correlated with the viscosity of the
secretions. Conclusion: The results of Tympanometry were correlated well with operative findings in children with
persistent OME undergoing ventilation tube placement.