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Abstract #12413 Published in IGR 7-2
Use of ultrasound biomicroscopy to diagnose Ahmed valve obstruction by iris
Carrillo MM; Trope GE; Pavlin C; Buys YMCanadian Journal of Ophthalmology 2005; 40: 499-501
BACKGROUND: We report 2 cases in which ultrasound biomicroscopy (UBM) was used to diagnose Ahmed valve obstruction by the iris. METHODS: Two patients underwent unilateral placement of Ahmed implants, one into the anterior chamber and the other into the ciliary sulcus. RESULTS: Intraocular pressures increased in the early postoperative period. In each case, a clear view of the aqueous drainage tube was precluded. Occlusion of the end of the tube by iris tissue was demonstrated by UBM. An iridectomy over the tip of the tube instituted filtration in each case. INTERPRETATION: UBM was instrumental in diagnosing the presence and cause of occlusion of aqueous drainage tubes.
Dr. Yvonne Buys, Toronto Western Hospital, 399 Bathurst Street, NEW 6-405, Toronto ON M5T 2S8, Canada. y.buys@utoronto.ca
Classification:
6.12 Ultrasonography and ultrasound biomicroscopy (Part of: 6 Clinical examination methods)
12.8.2 With tube implant or other drainage devices (Part of: 12 Surgical treatment > 12.8 Filtering surgery)