Surgical Outcomes of a Second Ahmed Glaucoma Valve Implantation in Asian Eyes with Refractory Glaucoma

Table 3

Comparison of studies evaluating success rates and surgical outcomes of second Ahmed glaucoma valve surgeries.

Authors	Ko et al. [16]	Smith et al. [17]	Nilforushan et al. [18]	Fatehi et al. [19]	Jiménez-Román et al. [20]	Our study
Number of eyes	23	19	36	110	58	21
Mean age (years)	44.5	58.0	32.7	63.8	46.1	48.8
Gender, male (%)	56.6	47.4	44.4	49.0	38.0	90.0
Mean follow-up (months)	37.8	38.8	21.4	59.6	18.4	49.2
First GDD type	17 FP7 (73.9%); 6 FP8 (26.1%)	19 FP7/S2 (unknown proportion)	—	—	6 S3 (10.3%); 50 S2; (86.2%); 2 FP7; (3.5%)	16 FP7 (76.2%); 3 S2 (14.4%); 1 Baerveldt (4.8%); 1 unknown (4.8%)
Second GDD type (%)	2 FP7 (8.7%); 21 FP8 (91.3%)	19 FP7/S2 (unknown proportion)	36 FP7 (100%)	55 FP7 (50%); 55 S2 (50%)	50 S2 (86.2%); 2 FP7; (3.5%)	21 FP7 (100%)
Mean preoperative IOP (mmHg)	39.3	18.8	26.9	25.7	27.6	23.4
Mean IOP reduction (mmHg)^†	20.8 (52.9%)	7.9 (42.0%)	13.6 (50.6%)	11.3 (44.1%)	12.7 (45.0%)	5.6 (23.9%)
Success rates^‡	87.0% (1 year); 70.0% (2 years); 52.0% (3 years)	—	94.0% (6 months); 85.0% (1 year); 80.0% (18 months); 53.0% (42 months)	70% (1 year); 63% (3 years); 57% (5 years)	62.9% (12 months); 56.6% (30 months)	80.0% (1 year); 67.5% (2; years); 54.0% (3; years)
Success^†	15 (65.2%)	16 (84.2%)	27 (75.0%)	—	—	12 (57.1%)
Failure^†	8 (34.8%)	3 (15.8%)	9 (25.0%)	—	—	9 (42.9%)

^†Calculated at the last follow-up, ^‡criterion for success: IOP ≥5 mmHg and ≤21 mmHg, with ≥20% reduction in IOP.