TY - JOUR
T1 - Aqueous Humor Dynamics in Uveitic Eyes
AU - Alaghband, Pouya
AU - Baneke, Alexander Jan
AU - Galvis, Elizabeth
AU - Madekurozwa, Michael
AU - Chu, Brian
AU - Stanford, Miles
AU - Overby, Darryl
AU - Lim, Kin Sheng
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Purpose: To investigate aqueous humor dynamics in uveitic eyes. Design: Cross-sectional study. Participants: Patients with recurrent (≥3 attacks) anterior uveitis (now quiescent) and being treated for glaucoma or ocular hypertension (OHT) (Group 1), previous recurrent anterior uveitis (≥3 attacks) without glaucoma or OHT (Group 2), and normal subjects with no ocular problems and IOP < 21 mm Hg at screening (control group; Group 3). Methods: Patients had one-off measurements. Group 1 patients who were on antihypertensives were washed out for a 4-week period, prior to their study measurements. Main outcome measures were tonographic outflow facility, aqueous humor flow rate, and uveoscleral outflow. Results: One hundred and one patients were screened between February 2014 and February 2017. Nine patients did not meet the inclusion criteria. Groups 1 and 3 each included 30 patients, and Group 2 included 32 patients. The mean intraocular pressure was higher in Group 1 compared to the others (25 ± 10.2 mm Hg in Group 1 vs 16 ± 2.7 mm Hg in Group 2 vs 16 ± 2.2 mm Hg in Group 3, P <.001). The tonographic outflow facility was lower in Group 1 compared to the others (0.18 ± 0.1 μL/min/mm Hg in Group 1 vs 0.25 ± 0.1 μL/min/mm Hg in Group 2 vs 0.27 ± 0.1 μL/min/mm Hg in Group 3, P =.005). However, aqueous humor flow rate was not statistically different (2.47 ± 0.9 μL/min in Group 1 vs 2.13 ± 0.9 μL/min in Group 2 vs 2.25 ± 0.7 μL/min in Group 3, P =.3). There was also no significant difference in calculated uveoscleral outflow. Conclusion: This is the first aqueous humor dynamics study in patients with uveitic glaucoma/OHT and recurrent anterior uveitis compared with age-matched controls. We have demonstrated that the elevated intraocular pressure seen in the uveitic glaucoma/OHT eyes (3-6 attacks) was due to reduced tonographic outflow facility. The aqueous humor flow rate was not detectibly different, nor did the calculated uveoscleral outflow demonstrate any discernible difference. However, the exact mechanism remains to be elucidated.
AB - Purpose: To investigate aqueous humor dynamics in uveitic eyes. Design: Cross-sectional study. Participants: Patients with recurrent (≥3 attacks) anterior uveitis (now quiescent) and being treated for glaucoma or ocular hypertension (OHT) (Group 1), previous recurrent anterior uveitis (≥3 attacks) without glaucoma or OHT (Group 2), and normal subjects with no ocular problems and IOP < 21 mm Hg at screening (control group; Group 3). Methods: Patients had one-off measurements. Group 1 patients who were on antihypertensives were washed out for a 4-week period, prior to their study measurements. Main outcome measures were tonographic outflow facility, aqueous humor flow rate, and uveoscleral outflow. Results: One hundred and one patients were screened between February 2014 and February 2017. Nine patients did not meet the inclusion criteria. Groups 1 and 3 each included 30 patients, and Group 2 included 32 patients. The mean intraocular pressure was higher in Group 1 compared to the others (25 ± 10.2 mm Hg in Group 1 vs 16 ± 2.7 mm Hg in Group 2 vs 16 ± 2.2 mm Hg in Group 3, P <.001). The tonographic outflow facility was lower in Group 1 compared to the others (0.18 ± 0.1 μL/min/mm Hg in Group 1 vs 0.25 ± 0.1 μL/min/mm Hg in Group 2 vs 0.27 ± 0.1 μL/min/mm Hg in Group 3, P =.005). However, aqueous humor flow rate was not statistically different (2.47 ± 0.9 μL/min in Group 1 vs 2.13 ± 0.9 μL/min in Group 2 vs 2.25 ± 0.7 μL/min in Group 3, P =.3). There was also no significant difference in calculated uveoscleral outflow. Conclusion: This is the first aqueous humor dynamics study in patients with uveitic glaucoma/OHT and recurrent anterior uveitis compared with age-matched controls. We have demonstrated that the elevated intraocular pressure seen in the uveitic glaucoma/OHT eyes (3-6 attacks) was due to reduced tonographic outflow facility. The aqueous humor flow rate was not detectibly different, nor did the calculated uveoscleral outflow demonstrate any discernible difference. However, the exact mechanism remains to be elucidated.
UR - http://www.scopus.com/inward/record.url?scp=85072685616&partnerID=8YFLogxK
U2 - 10.1016/j.ajo.2019.08.018
DO - 10.1016/j.ajo.2019.08.018
M3 - Article
C2 - 31473215
AN - SCOPUS:85072685616
SN - 0002-9394
VL - 208
SP - 347
EP - 355
JO - American Journal of Ophthalmology
JF - American Journal of Ophthalmology
ER -