Sulfur hexafluoride in owl monkey vitreous cavity

Area of Science:

• Ophthalmology
• Ocular Surgery
• Gas Tamponade

Background:

• Gas tamponades are crucial in vitreoretinal surgery.
• Understanding the behavior and safety of intraocular gases is essential.

Purpose of the Study:

• To compare the intraocular behavior and retinal toxicity of sulfur hexafluoride (SF6) gas versus air in owl monkey eyes.

Main Methods:

• Sulfur hexafluoride (SF6) and air were injected into the vitreous cavity of owl monkey eyes.
• Gas duration, volume expansion, and retinal toxicity were evaluated.
• Ocular tissues were analyzed using electroretinography, histology, and electron microscopy.

Main Results:

• Sulfur hexafluoride (SF6) gas persisted in the vitreous cavity for 10–11 days, approximately twice as long as air (5–6 days).
• Gas volume expanded due to diffusion of other gases.
• Lens opacities developed in eyes with continuous gas contact, irrespective of gas type.
• No significant difference in retinal toxicity was observed between SF6 and air.

Conclusions:

• Sulfur hexafluoride (SF6) offers a longer duration of tamponade compared to air in the vitreous cavity.
• SF6 gas is not more toxic to the retina than air.
• Lens opacities are a potential complication of both gases when in prolonged contact with the lens.