Purpose: To measure and compare the levels of vascular endothelial growth factor (VEGF) in the aqueous humor of patients with acute primary angle closure (APAC), primary angle-closure glaucoma (PACG), and normal cataract (controls).
Methods: Aqueous humor samples were prospectively collected from 38 APAC eyes, 36 PACG eyes, and 25 nonglaucomatous cataract control eyes. The levels of aqueous humor VEGF were measured using enzyme-linked immunoassays. The clinical characteristics of participants were also collected for correlation analysis.
Results: VEGF was detected in aqueous humor samples of 35 of 38 APAC patients (mean±SE of the mean, 935±258 pg/mL), 30 of 36 PACG patients (165±37.5 pg/mL), and 16 of 25 cataract controls (69.5±13.5 pg/mL). The mean concentration of VEGF in APAC eyes was 13.5 and 5.7 times higher than that in controls and PACG eyes, respectively, and these differences were statistically significant (both P<0.0167). In the correlation analysis that included all participants, the aqueous humor VEGF level was found to correlate negatively with axial length (ρ=-0.342, P=0.001), and positively with intraocular pressure (ρ=0.434, P<0.001).
Conclusions: VEGF was significantly increased in aqueous humor of APAC eyes. An increase in aqueous humor VEGF may be the result of the characteristic ocular ischemia and hypoxia observed in APAC eyes as a consequence of sudden excessive increases in intraocular pressure during the acute episode.