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The reference c20062 has been allocated to this case by rayner.The patient underwent implantation of a rayone aspheric rao600c in the od eye on (b)(6) 2020.The healthcare facility reports that one day post-operatively, the patient was seeing 20/40, iop was 31 (she was comfortable and had no pain) and had 3+ cell and fibrin membrane over pupil.The patient's cornea was confirmed to be clear.Use of inveltys was increased to 4-6x daily and the patient was placed on combigan bid and given 1 drop of atropine during their consultation.Patient was also instructed to continue antibiotic drops and nsaid.Post-op day three the patient's visual acuity was 20/60, iop was 17.The patient reported that they felt as if their vision was hazier but there was no pain or redness.The patient did not have a conj injection.The healthcare professional remarked that at this visit the patient had 1+ central k edema, but ac reaction was down to 1+ cell and fibrin membrane had resolved.Following this visit, the healthcare professional instructed the patient to continue the same regimen as was prescribed at the post-op day one consult.Post-op day ten the patient's visual acuity was 20/30, iop was 19.The patient reported improvement in their vision but noted that it was still slightly hazy.The healthcare facility notes that there was trace residual k edema/folds, ac was deep and quiet.Patient was instructed to reduce combigan to qhs and taper off inveltys bid for 2 weeks, then qday for 2 weeks.The patient will be reviewed again in one months time.Mechanical damage to iris, or uveal structures from surgical manipulations or trauma, complications arising from incidence of tass, pex syndrome, diabetes, previous uveitis, previous intraocular surgery and diabetic surgery are all identified as possible causes of "fibrin reaction" within rayner's risk analysis.The verbatim report received makes a reference to fibrin presenting almost like "slight tass".The aetiology of tass may be multi-factorial with numerous potential causes including but not limited to; bacterial endotoxins or particulate contamination of balanced salt solutions, intraocular irrigating solutions with abnormal ph, osmolarity or ionic composition, denatured ophthalmic viscosurgical devices (ovd), intraocular medications (antibiotics in the irrigation solutions or intracameral antibiotics), topical ointments, inadequate sterilization of surgical instruments and tubing, inadequate flushing of instruments between cases resulting in build-up of ophthalmic viscosurgical devices (ovd), preservative and metallic precipitate.The case details were sent to a clinical consultant for review.The feedback received is as follows; "two cases are described in which patients experienced exacerbated inflammation on postoperative day one.In the second of the two cases, the pupil had been enlarged with a malyugin ring.The dominant features in both cases were anterior chamber cell and a fibrinous reaction, with a minor component of corneal edema.In the first case, which also had a mildly elevated intraocular pressure, the condition was resolving with topical steroid treatment.No follow up beyond the first postoperative day has been provided for the second case.The differential diagnosis of postoperative fibrinous reaction includes the following entities: mechanical damage to the iris, toxic anterior segment syndrome (tass), pseudoexfoliation syndrome, diabetes, exacerbation of pre-existing uveitis, postoperative endophthalmitis (poe), systemic aminocaproic acid.In neither case is the medical history (e.G., diabetes, medications) provided.In the first case, no predisposing factors are noted.In the second case, pupillary dilation with the malyugin ring may represent a contributing factor.In both cases, it appears that pseudoexfoliation, pre-existing uveitis and infectious poe may be ruled out.The most likely etiology of these cases is tass.Many possible causes of tass have been indicated, including intraocular solutions with inappropriate chemical composition, concentration, ph, or osmolality; preservatives; denatured ophthalmic viscosurgical devices; enzymatic detergents; bacterial endotoxin; oxidized metal deposits and residues; and factors related to iols such as residues from polishing or sterilizing compounds.Given that tass appears to be the most likely diagnosis in the first case, and also a possible concomitant diagnosis, along with mechanical damage to the iris, in the second case, an investigation into the causation is a reasonable pursuit; however, it is often difficult to identify specific etiologic factors.In the setting of isolated cases of tass, such as the two cases reported herein, the likelihood that the intraocular lens is causative is extremely low".For details of the second case referred to within the clinical feedback, please refer to fda mdr 3012304651-2020-00006.Endotoxin and bioburden were within tolerance of their respective limits and we have therefore ruled out a rayner microbiological cause for this case of fibrin/tass.
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