Anatomical and Functional Outcomes of Pneumatic Retinopexy for Retinal Detachment: A 2-Year Case Series

Anatomical and Functional Outcomes of Pneumatic Retinopexy for Rhegmatogenous Retinal Detachment Using PIVOT Criteria: A 2-Year Case Series From a Referral Center in Southwestern Colombia

The goal of this observational study is to evaluate the 2-year anatomical and functional outcomes of pneumatic retinopexy in phakic adult patients with superior rhegmatogenous retinal detachment meeting adapted PIVOT eligibility criteria. The main questions it aims to answer are to determine the primary anatomical success rate over 24 months-defined as sustained retinal reattachment without secondary vitrectomy or scleral buckling-and to evaluate long-term visual acuity outcomes and structural macular integrity measured by OCT. As a single-arm observational case series, participants undergo baseline ophthalmic evaluation (BCVA, OCT, and fundus photography), followed by a standardized outpatient procedure consisting of anterior chamber paracentesis (0.3 cc), inferotemporal intravitreal 100% C3F8 gas injection (0.7 cc), face-down positioning followed by the steam-roll maneuver, postoperative 577-nm yellow laser retinopexy with a 360° peripheral barrier upon reattachment, and protocolized follow-up evaluations on Day 1, at 3 weeks, 6 weeks, 3 months, and up to 24 months.

Rhegmatogenous retinal detachment (RRD) is a critical ophthalmic emergency caused by full-thickness retinal breaks that permit subretinal fluid accumulation, risking irreversible photoreceptor damage. Pneumatic retinopexy (PnR) combines intravitreal expansile gas injection with laser or cryotherapy retinopexy as a minimally invasive outpatient procedure. Although the landmark PIVOT trial demonstrated the non-inferiority and functional advantages of PnR compared to vitrectomy in selected cases, long-term 2-year prospective evidence on anatomical and functional outcomes in Latin American settings remains limited.

This prospective observational study evaluated 33 phakic adult patients presenting with superior RRD who strictly met adapted PIVOT eligibility criteria at Clínica Oftalmológica Paredes in Pasto, Colombia. Preoperative assessment included a comprehensive evaluation by a retina specialist, best-corrected visual acuity (BCVA), macular OCT (AngioVue/RTVue XR), and wide-field retinal photography (Eidon FA). Before gas injection, 577-nm yellow argon laser photocoagulation was applied to any retinal breaks without associated detachment.

The standardized surgical intervention was performed under topical anesthesia and operating room aseptic conditions, beginning with an anterior chamber paracentesis extracting 0.3 cc of aqueous humor, followed by an inferotemporal injection of 0.7 cc of 100% C3F8 gas 4 mm from the limbus and compressive hemostasis. Following the injection, patients maintained a strict face-down position for one hour and, after verifying foveal reattachment and intraocular pressure, initiated the steam-roll positioning maneuver to guide the gas bubble over the break.

Within 24 to 48 hours post-injection, once retinal reattachment was achieved, complete 577-nm yellow laser photocoagulation was performed around the breaks along with a 360° peripheral laser barrier, while non-responding cases were scheduled for secondary vitrectomy within one week. Long-term follow-up of successful cases was conducted on Day 1, at 3 weeks, 6 weeks, 3 months, and up to 24 months to document primary anatomical success, tear tamponade efficacy, BCVA evolution, IS/OS junction integrity on OCT, intraocular pressure dynamics, and complications such as macular edema or epiretinal membrane formation.

Inclusion Criteria:

• Age 18 years or older.
• Phakic status in the study eye.
• Diagnosis of primary rhegmatogenous retinal detachment (RRD).
• Single retinal break or a group of breaks extending within 1 clock hour of the upper retina (located between 8:00 and 4:00 clock hours).
• Ability and willingness to comply with post-procedure face-down positioning, steam-roll maneuvers, and scheduled follow-up visits.

Exclusion Criteria:

• Pseudophakic or aphakic status.
• Retinal breaks located in the inferior 4 clock hours (between 4:00 and 8:00 clock hours).
• Multiple retinal breaks spanning more than 1 clock hour.
• Presence of proliferative vitreoretinopathy (PVR) grade C or D.
• Media opacities obstructing adequate visualization of the fundus or preventing effective laser photocoagulation (e.g., severe vitreous hemorrhage or advanced cataract).
• Uncontrolled baseline intraocular pressure or pre-existing advanced glaucoma.
• History of prior vitreoretinal surgery in the study eye.
• Physical, mental, or geographic inability to maintain strict post-procedure positioning or fulfill protocol requirements.