Long-Term Intraocular Pressure Changes after Pars Plana Vitrectomy: An 8-Year Study

Arash Omidtabrizi; Vahid Ghavami; Masoud Shafiee; Razieh Bayani; Touka Banaee

doi:10.4103/JOCO.JOCO_85_20

Long-Term Intraocular Pressure Changes after Pars Plana Vitrectomy: An 8-Year Study

J Curr Ophthalmol. 2020 Dec 12;32(4):335-342. doi: 10.4103/JOCO.JOCO_85_20. eCollection 2020 Oct-Dec.

Authors

Arash Omidtabrizi^{1

2}, Vahid Ghavami³, Masoud Shafiee^{1

2}, Razieh Bayani^{1

2}, Touka Banaee^{1

2

4}

Affiliations

¹ Retina Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
² Department of Ophthalmology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
³ Department of Biostatistics, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran.
⁴ Department of Ophthalmology and Visual Sciences, University of Texas Medical Branch at Galveston, TX, USA.

Abstract

Purpose: To investigate the long-term changes of intraocular pressure (IOP) after pars plana vitrectomy (PPV).

Methods: This was a retrospective historical cohort study. Patients with a history of vitrectomy in one eye by a single surgeon were enrolled. IOP of the operated eye was compared to the fellow eye. Previous scleral buckling, IOP rise due to surgical/anatomic complications, silicone oil (SO) emulsification, and contralateral ocular hypertension/glaucoma at recruitment were exclusion criteria. "Significant IOP rise" (>6.0 mmHg) and development of open angle glaucoma (OAG) were the main outcome measures.

Results: Two hundred and twenty-five eyes were included. Mean and median follow-up duration were 20.6 and 9.0 months, respectively. Mean baseline IOP and mean final IOP were 13.53 ± 3.75 mmHg and 16.52 ± 6.95 mmHg, respectively (P < 0.001). Forty-three patients developed "significant IOP rise" with no statistically significant relation to the indication of vitrectomy, the postoperative lens status, and number of vitrectomies (P = 0.410, P = 0.900, and P = 0.160, respectively). SO injection raised the probability of IOP rise in the long-term (P = 0.028). OAG occurred in 17 patients (7.5%) with no association to SO tamponade (P = 0.840). "Significant IOP rise" and OAG occurred in 3 and 1 control eyes, respectively, significantly lower than the rates in study eyes (P < 0.001).

Conclusion: Mean IOP slightly rose in the long-term after PPV. SO tamponade was associated with IOP rise in the long-term but not with the incidence of OAG. Both IOP rise and OAG were more probable after vitrectomy.

Keywords: Intraocular pressure; Open angle glaucoma; Pars plana vitrectomy; Silicone oil.