2Associate Prof., University of Health Sciences, Ankara Ulucanlar Eye Training and Research Hospital, Ankara, Turkey DOI : 10.37845/ret.vit.2021.30.40 Purpose: To compare the effects of the evaluation of adequate silicone oil injection by the infusion cannula or vent cannula at the end of the surgery on the intraocular pressure (IOP) in patients who underwent silicone oil tamponade due to rhegmatogenous retinal detachment (RRD).
Materials and Methods: We evaluated two different groups which underwent 5000 cSt silicone tamponade at the end of vitreoretinal surgery performed for RRD. There were 28 eyes (from 28 patients) in the group 1. In this group, the sufficient silicone oil in the vitreous was controlled by onset of silicone oil drainage from the infusion cannula at the end of the surgery and the injection process was terminated. There were 27 eyes (from 27 patients) in the group 2. In this group, silicone oil injection was terminated with the onset of silicone drainage in the vent cannula. Postoperative IOP controls were performed using a pneumotonometer.
Results: In group 1, the mean IOP was 20.25 ± 8.22 mmHg in group 1 and IOP was > 21 mm Hg in 10 patients (35.71%) on day 1 after surgery. In group 2, the mean IOP was 17.26 ± 6.11 mmHg and IOP was >21 mmHg in 4 patients (14.81%). There was a significant difference in IOP measured on day 1 after surgery between the two groups (p = 0.018). On week 1 after surgery, the mean IOP of the patients was 15.50 ± 4.16 mmHg in group 1 and 15.00 ± 4.33 mmHg in group 2 (p = 0.858). On month 1, mean IOP was 14.39 ± 3.70 mmHg in group 1 and 13.85 ± 3.98 mmHg in group 2 (p = 0.935).
Conclusion: The vent cannula, which has been introduced into vitreoretinal surgery in recent years, is advantageous in terms of IOP control in the early postoperative period and it provided better results when compared to follow-up with the onset of silicone drainage from infusion cannula.
Keywords : Infusion cannula, retinal detachment, silicone oil, vent cannula, vitreoretinal surgery