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Electrophysiological responses after vitrectomy and intraocular tamponade
Transactions of the Ophthalmological Societies of the United Kingdom
|January 1, 1985
Summary
Intraocular gas or liquid silicone after vitrectomy for retinal detachment initially depresses electroretinogram (ERG) waves. However, retinal function recovers, suggesting these agents do not adversely affect long-term retinal function.
Area of Science:
- Ophthalmology
- Retinal Surgery
- Visual Electrophysiology
Background:
- Conflicting reports exist on electroretinogram (ERG) changes after intravitreal liquid silicone in animal models.
- Limited human data is available on the impact of vitrectomy and gas or liquid silicone tamponade on retinal function.
Purpose of the Study:
- To investigate the effects of intraocular tamponade with liquid silicone or SF6 gas on retinal function in humans undergoing vitrectomy for retinal detachment.
- To compare the functional recovery of the retina in the presence of different tamponading agents.
Main Methods:
- Serial electroretinography (ERG) was performed on patients undergoing vitrectomy for rhegmatogenous retinal detachment, with intraocular tamponade by liquid silicone or SF6 gas.
- Control patients without retinal detachment requiring vitrectomy were included.
- ERG recordings were taken preoperatively, postoperatively, and up to 6 months.
Main Results:
- A transient reduction in both a- and b-wave amplitudes was observed in the early postoperative period for all patients.
- Progressive recovery of ERG waves occurred in all patients.
- ERG recovery was faster with gas absorption or silicone removal.
Conclusions:
- The initial depression of ERG is attributed to vitrectomy, not the tamponading agent.
- Retinal function recovers even with intraocular gas or liquid silicone present.
- The temporary reduction in ERG amplitude is likely due to the insulating effect of the tamponading agent, with no adverse long-term impact on retinal function.