Wednesday, 30 November 2016

Fistula Test





How are the results of Fistula test interpreted?
1. In fistula over the dome of the lateral semicircular canal: Increase pressure causes conjugate horizontal deviation of the eyes towards the normal side. As pressure is maintained, jerk nystagmus develops with fast component towards the affected ear. As pressure is released, eyes return to normal

2. Fistula of the lateral semicircular canal (anterior to the ampulla) causes deviation of eyes, to the affected side

3. Vestibular erosion causes rotatory horizontal nystagmus towards the diseased ear

4. Fistula of the posterior semicircular canal causes vertical movement of eyes.


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