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Abstract #46606 Published in IGR 13-3
Ultrasound biomicroscopy measured anterior and posterior chamber diameters--a novel way to evaluate angle-closure glaucoma
Kulachanpises C; Yuttitham K; Wanichwecharungruang BJournal of the Medical Association of Thailand 2011; 94: 579-584
To investigate anterior and posterior chamber diameters in primary angle-closure (PAC) and to correlate them to the angle opening parameters. Fifty eyes of PAC and 45 age-matched controls underwent ultrasound biomicroscopy (UBM; model P60, Paradigm Medical Industries Inc., Salt Lake City, UT) scanning. Superior, inferior temporal and nasal angle opening parameters were obtained. Anterior chamber diameter, indicated by angle-to-angle diameter (AAD) and posterior chamber diameter indicated by sulcus-to-sulcus diameter (SSD), were analyzed. Mean age was not different between PAC and controls, 59.80 +/- 9.11 versus 56.33 +/- 13.39, respectively (p = 0.140). PAC demonstrated a relatively smaller eye than the controls; e.g., corneal diameter; anterior chamber depth (ACD) and axial length, (all p < 0.05). AAD was shorter in PAC than the controls, 10.16 +/- 0.58 versus 10.88 +/- 0.55 mm, (p < 0.001). AAD was correlated to PAS extent (r = -0.358), ACD (r = 0.659), SSD (r = 0.636) and scleral spur to iris root insertion (r = 0.505), (all p < 0.001). SSD was also smaller in PAC than controls, 10.16 +/- 0.45 versus 10.52 +/- 0.52 mm, (p = 0.001). Crowded anterior segment of PAC can be demonstrated by a novel parameter of AAD and SSD, obtained with a newer model of UBM. The shorter AAD indicates the greater PAS extent and smaller angle. Both parameters are independent to scleral spur, and are simple to evaluate PAC.
C. Kulachanpises. Glaucoma Services, Department of Ophthalmology, Rajavithi Hospital, Ministry of Public Health and College of Medicine, Rangsit University, Bangkok, Thailand.
Classification:
6.12 Ultrasonography and ultrasound biomicroscopy (Part of: 6 Clinical examination methods)
9.3.5 Primary angle closure (Part of: 9 Clinical forms of glaucomas > 9.3 Primary angle closure glaucomas)