Table 4.
Postoperative complications and surgical interventions
| Trabeculectomy n = 32 | Canaloplasty n = 30 | p‐Valuea | |
|---|---|---|---|
| Early complications ≤90 days | |||
| Hypotony (IOP<5 mmHg) | 12 (37.5) | 6 (20.0) | 0.17 |
| Shallow anterior chamber | 2 (6.2) | 0 (0.0) | 0.49 |
| Choroidal detachment | 4 (12.5) | 1 (3.3) | 0.36 |
| Elevated IOP (IOP >25 mmHg) | 8 (25.0) | 9 (30.0) | 0.78 |
| Conjunctival leak | 3 (9.4) | 3 (10.0) | 1.00 |
| Corneal erosion | 14 (43.8) | 1 (3.3) | <0.001 |
| Hyphaema (≥ 1 mm layered blood) | 1 (3.1) | 7 (23.3) | 0.02 |
| Intracorneal hematoma after Descemet detachment | – | 1 (3.3) | |
| Secondary suture migration | – | 2 (6.7)b | |
| Iris incarceration | 1 (3.1) | – | |
| Scarring of the filtering bleb | 1 (3.1) | – | |
| Blebitis/endophthalmitis | 0 (0.0) | 0 (0.0) | |
| Early surgeries | |||
| Laser suture lysis, eyes | 24 (75.0) | – | |
| Number of sutures [median (IQR)] | 1.00 (0.25–2.00) | ||
| 5‐FU bleb injections | 29 (90.6) | – | |
| Number of injections [median (IQR)] | 7.00 (5.00–7.75) | ||
| Iris revision | 1 (3.1) | – | |
| Scleral flap revision (hypotony) | 6 (18.8) | 1 (3.3)c | 0.11 |
| Scleral flap revision (elevated IOP) | 0 (0.0) | – | |
| Bleb needling | 1 (3.1) | – | |
| Conjunctival suturing | 1 (3.1) | 2 (6.7) | 0.61 |
| Nd:YAG laser goniopuncture | – | 4 (13.3) | |
| Second surgeries | |||
| Laser cyclophotocoagulation | 0 (0.0) | 2 (6.7) | 0.19 |
| Trabeculotomy | 0 (0.0) | 1 (3.3) | |
| Late complications (>90 days) | |||
| Elevated IOP (IOP >25 mmHg) | 1 (3.1) | 1 (3.4) | 1.00 |
| Hypotony (IOP<5 mmHg) | 6 (18.8) | 0 (0.0) | 0.03 |
| Scarring of the filtering bleb | 8 (25.0) | – | |
| Blebitis/endophthalmitis | 0 (0.0) | 1 (3.4)d | 0.48 |
| Late surgeries | |||
| Scleral flap revision (hypotony) | 1 (3.1) | 0 (0.0) | 1.00 |
| Second surgeries | |||
| Laser cyclophotocoagulation | 0 (0.0) | 1 (3.4) | 0.48 |
n = sample size, IOP = intraocular pressure, 5‐FU = 5‐fluorouracil, Nd:YAG = Neodynium:yttrium aluminium garnet, IQR = interquartile range.
Data are absolute values (%) or median (interquartile range) as stated.
a
Fisher exact test, chi‐square test, as appropriate.
b
In 1 canaloplasty patient with suture displacement and penetration into the anterior chamber, suture had to be removed by paracentesis.
c
Scleral patch was used for external drainage in 1 patient of the canaloplasty group.
d
Endophthalmitis occurred after phacoemulsification and was not associated with leakage after canaloplasty.