Perfluoropropane SIR, We should like to report a case where the intraocular gas, perfluoropropane (C3F8), was used to reform a flat anterior chamber occurring after fistulising surgery. The technique may be of value to others facing this problem.A 68-year-old man underwent routine trabeculectomy. From the first postoperative day the eye was hypotonous and the anterior chamber shallow. By the fourth day large choroidal effusions were present and cornea-lens contact had developed.The anterior chamber was reformed with sodium hyaluronate (Healonid) and the sclerostomy sutured tightly shut. Unfortunately by the seventh day after trabeculectomy cornea-lens contact had recurred. The anterior chamber was again reformed with sodium hyaluronate and the choroidal effusions partly drained, but 72 hours later cornea-lens touch was present. On this occasion a bubble of 12% C3F8 was injected through an oblique track in the cornea into the anterior chamber without drainage of the choroidal effusion. This concentration is non-expansile' and was used in sufficient volume, approximately 0-5 ml measured in the syringe, to reform the anterior chamber.The bubble filled the anterior chamber for five days before slowly being absorbed, so that 12 days after injection aqueous filled more than half the chamber.
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