– Ear Endoscopy
H Silverstein, PT Rowan, MJ Olds, et al (Ear Research Found, Sarasota, Fla).
Inner Ear Perfusion and the Role of Round Window Patency.
Am J Otol 18:586-589, 1997.
Direct drug injection through the tympanic membrane into the middle ear is commonly done to achieve diffusion of an agent through the round window membrane.
Patients undergoing middle ear endoscopy were studied before inner ear perfusion with medication.
Treatment was needed for Meniere’s disease, sudden sensorineural hearing loss, or tinnitus. Each patient underwent laser-assisted tympanostomy and middle ear endoscopy. Adhesions overlying the round window membrane were lysed.
A significant number of patients with no history of manipulation of the area had round window obstruction. To enhance adequate diffusion of intratympanic instillation of medication, evaluation of the round window is essential.