Which gas is most commonly used with pneumatic retinopexy –
**Core Concept**
Pneumatic retinopexy is a non-surgical procedure used to treat retinal detachment by injecting a gas bubble into the vitreous space to push the retina back in place. The gas used plays a crucial role in the success of the procedure.
**Why the Correct Answer is Right**
The most commonly used gas for pneumatic retinopexy is sulfur hexafluoride (SF6). This is because SF6 has a relatively short half-life, which allows it to be absorbed by the body within 1-2 weeks. This makes it ideal for pneumatic retinopexy, as it does not linger in the eye for too long and can be absorbed without causing complications. SF6 also has a density that is close to that of the vitreous humor, which makes it easier to control the movement of the gas bubble.
**Why Each Wrong Option is Incorrect**
**Option A:** Perfluoropropane (C3F8) is another gas used for pneumatic retinopexy, but it has a longer half-life than SF6 and is not as commonly used for this procedure.
**Option B:** Nitrous oxide is a gas used as an anesthetic and not for pneumatic retinopexy.
**Option C:** Air is not suitable for pneumatic retinopexy as it is not dense enough to push the retina back in place effectively.
**Clinical Pearl / High-Yield Fact**
When performing pneumatic retinopexy, it is essential to use the correct gas to ensure the success of the procedure. SF6 is the most commonly used gas due to its short half-life and ideal density.
**Correct Answer:** C.