The following test is useful for diagnosis of: (A) Unsafe CSOM, (B) Meniere's disease, (C) Gradenigo syndrome, (D) Cholesteatoma
Answer is B. Ans. (b) Meniere's disease.* The image shows performance of the caloric stimulation test.* Irrigation of the external meatus with water 7deg above and later 7deg below body temperature sets up convection currents of the endolymph in the semi-circular canals.* This causes nystagmus, and the duration of the nystagmus gives an index of the activity of the labyrinth. The nystagmus can be directly observed or recorded electrically (electronystagmography).* This test is particularly valuable in the diagnosis of Meniere's disease and acoustic neuroma. A reduced or absent nystagmus is found (canal paresis).