Floppy Iris Syndrome Research Articles

Is Floppy Eyelid Syndrome predictive of Intraoperative Floppy Iris Syndrome? A prospective and translational study

Intraoperative floppy iris syndrome (IFIS) is defined as an excessive billowing of the iris during cataract surgery. Floppy eyelid syndrome is defined as an excessive hyperlaxity of the eyelids. Based in our daily experience, we suspected FES to be associated with IFIS. This association has been investigated. The goal of the study was to explore whether FES was predictive of IFIS. We conducted a prospective observational single-center study at the University Hospital of Nice. IFIS and FES were investigated in patients undergoing cataract surgery from November 2019 to May 2021. In addition, tarsus and iris samples were harvested in 2 fresh cadavers, and Verhoeff staining was used to identify elastin fibers. We included 452 eyes (n=312 patients, 50.9% male) with a mean age of 71.7years (±11.4). IFIS was diagnosed in 88 (19.5%) patients, including 20 (4.4%) grade 1, 34 (7.5%) grade 2, and 33 (7.3%) grade 3. FES was diagnosed in 35 (7.7%) patients. PEX was found in 23 (5.1%) patients. On multivariate analysis, FES (P<0.001), pseudo exfoliation (P=0.017), intracameral dilatation (P<0.004), senior surgeons (P=0.009) and α1-ARA (P<0.001) were associated with IFIS. Elastin fibers were identified in small amounts in the tarsus samples but not in the iris samples. FES is predictive of IFIS. Surgeons should be aware of this association to prevent intraoperative complications.

Floppy iris. How is floppy iris syndrome managed? What do urologists and ophthalmologists say?

This study focuses on the effect of chronic treatment on the eye, regarding the so-called Intraoperative Floppy Iris Syndrome (IFIS) or Floppy Iris Syndrome, which can occur during cataract surgery. The study aimed to establish the influence of tamsulosin, used in benign prostatic hyperplasia (BPH) treatment on the iris, during cataract surgery, considering the increased incidence of both conditions in older age. This study included one hundred male patients, operated on for cataracts at the Ofta Total Clinic and Dr. Stănilă Medical Centre, in Sibiu, out of 601 patients operated on for cataracts between February and October 2022. Of the 100 patients, 24 used medication for BPH. 5 patients used prostamol, a phytotherapeutic preparation, which is an extract from Serenoarepens, and the remaining 19 used tamsulosin, which is an alpha-blocker, most commonly used in the treatment of BPH, considered the first-line treatment option. In 15 patients, we intraoperatively managed, a medium mydriasis through pharmacological dilation, including intracameral administration of phenocaine and mechanical dilation or stripping. In 4 patients it was necessary to apply iris dilators. Due to the small pupil in 2 patients, we caught the iris in the phacoemulsification probe, and a small, incomplete iris coloboma was formed. Sometimes, there was a turnover of Descemet in 4 patients. The pupil remained semi-dilated and slightly areflective in the patients to whom we applied iris hooks. The patients' visual acuity was satisfactory, between 0.9 and 0.6. The topic gives rise to many discussions. It seems that stopping the administration of tamsulosin for a short time does not help the occurrence of IFIS, because the iris lesions seem irreversible. Patients at risk of developing cataracts should be evaluated and possibly referred to an ophthalmologist to determine surgery before starting treatment for BPH and to competently assess the administration of this medication. Collaboration between urologists and ophthalmologists is required for patients prone to the appearance of cataracts since both conditions are frequently encountered in elderly patients.

Intraoperative Iris Behavior during Phacoemulsification Maneuvers in Rabbits Treated with Selective α1-Blocker, 5α-Reductase Inhibitor, or Anxiolytic Medication.

This prospective, experimental study aims to evaluate the association between administration of α-blocker, 5α-reductase inhibitor, or anxiolytic medications and intraoperative floppy iris syndrome (IFIS) using a rabbit animal model. A total of 31 Metis rabbits were distributed into four groups as follows: 10 rabbits given tamsulosin, 10 rabbits given finasteride, 5 rabbits who received lorazepam, and 6 treatment-naive animals in the control group. Dosing was calculated according to body surface area ratio of man to rabbit, with a dosing duration of 43 days for all groups. Phacoemulsification maneuvers were performed by a single surgeon, who was blinded to group allocation. Any intraoperative billowing of the iris was noted and subsequently graded from 0 to 3. Higher incidences of iris billowing were found in the tamsulosin-dosed animals [OR = 8.33 (CI 95% 0.63-110.09)], (p = 0.13), the finasteride group [OR = 11.6 (CI 95% 0.92-147.6)], (p = 0.11), and the lorazepam group [OR = 7.5 (CI 95% 0.45-122.8)], (p = 0.24), as opposed to the control. Administration of α-blocker tamsulosin, 5α-reductase inhibitor finasteride, or anxiolytic medication lorazepam induces altered intraoperative iris behavior. These results correspond with previous studies and further solidify the hypothesis that systemic medication, administered both long and short-term, influences surgical parameters in cataract surgery. The present study can become the basis for further clinical or experimental research.

Prevalence and prediction of intraoperative floppy iris syndrome in patients with pseudoexfoliation syndrome

ObjectiveTo investigate the incidence of intraoperative floppy iris syndrome (IFIS) in patients with pseudoexfoliation syndrome (PXF) and analyze preoperative ocular predicting factors. DesignA retrospective case-control study MethodsThe study included 224 eyes with PXF and 287 control eyes without PXF. One eye per patient, who underwent cataract surgery at the Wolfson Medical Center between January 2020 to December 2021, was included. Medical records of the patients were reviewed. Data collected included demographic characteristics, medical history, preoperative comprehensive ophthalmic examination, biometry, surgical procedure details, and IFIS occurrence. The association of IFIS with preoperative ocular parameters was analyzed through both univariant and multivariant analyses. ResultsPatients with PXF were older and had a higher prevalence of glaucoma (77.6 ± 6.4 years vs 74.2±7.6 years; p < 0.001, and 20.1 % vs 9.8 %, p < 0.001, respectively). Prevalence of α-blockers treatment was similar in both groups. IFIS rate among the PXF group was 12.5% (n = 28) compared to 7.3% (n = 21) in the control group (p < 0.05). When omitting patients exposed to α-blockers, the PXF group exhibited a significantly higher IFIS rate (9.9% vs 4.8%; p < 0.05). Pupil dilation diameter was significantly lower among PXF patients (5.8 ± 1.1 mm vs 6.9 ± 0.99 mm; p < 0.001). Biometric evaluation revealed significant differences in anterior segment depth (ACD) and lens thickness (LT). Multivariate analysis indicated that PXF and decreased mydriatic pupil size remained significant predictors of IFIS. ConclusionThis study establishes an association between PXF and an increased risk of IFIS during cataract surgery, independent of α-blockers treatment.

Understanding the side effects of chronic silodosin administration via untargeted metabolomics approach

Precision medicine, which looks for high efficacy and low toxicity in therapies, has increased in popularity with omics technology. This work aims to discover novel and low-toxicity therapy options by examining the complex relationship between silodosin-induced side effects and the metabolomic profiles associated with its administration. The plasma samples of the control group and silodosin-treated rats were analyzed by LC-Q-TOF-MS/MS. Employing XCMS and MetaboAnalyst software, MS/MS data processed to detect compounds and investigate metabolic pathways. MATLAB 2019b was used for data categorization and multivariate analysis. A thorough comparison of METLIN and HMDB databases revealed 41m/z values with significant differences between the drug-treated and control groups (p <0.01 and fold analysis≥1.5). According to multivariate data analysis, 17-β-estradiol, taurocholic acid, L-kynurenine, N-formylkynurenine, D-glutamine, L-arginine, prostaglandin H2, prostaglandine G2, 15-keto-prostaglandin E2, calcidiol, thromboxane A2, 5'-methylthioadenosine, L-methionine and S-adenosylmethionine levels changed significantly compared to the control group. Differences in the metabolisms of glycerophospholipid, tyrosine, phenylalanine, arachidonic acid, cysteine and methionine, and biosynthesis of phenylalanine, tyrosine, and tryptophan, and aminoacyl-tRNA have been successfully demonstrated by metabolic pathway analysis. According to this study, vitamin D, D-glutamine, and L-arginine supplements can be recommended to prevent side effects such as fatigue, intraoperative floppy iris syndrome, blurred vision, and dizziness in the treatment of silodosin. Silodosin treatment negatively affected the immune system by affecting the kynurenine and tryptophan metabolism pathways. The study is a guide for silodosin treatments that offer low side effects and high therapeutic effect within the scope of precision medicine.

Intracameral phenylephrine for surgical mydriasis and intraoperative floppy-iris syndrome: systemic adverse effects and optimal dose.

Phenylephrine, a potent sympathomimetic, induces mydriasis via iris dilator muscle contraction. Intracameral (IC) phenylephrine has been successfully used in cataract surgery for initial mydriasis, maintaining mydriasis, and management of intraoperative floppy-iris syndrome. Serious systemic adverse events (mainly cardiovascular) have been described with topical phenylephrine drops, but we found very little evidence of such adverse events associated with IC phenylephrine use. However, we suspect under-reporting of such adverse events, as they may instead be ascribed to anxiety, positioning, anesthesia, etc. Optimal dosage/concentrations for IC phenylephrine use in different purposes have not been fully studied. In the absence of robust evidence, we suggest that lower but effective IC phenylephrine concentrations are used: a lower concentration (0.31%), in conjunction with an anticholinergic and lidocaine, may be used for initial mydriasis. For management of intraoperative floppy-iris syndrome, 0.31% may be effective, though a higher concentration (1% to 1.25%) may be required.

Fluid-structure interaction in phaco-emulsification based cataract surgery

Cataract scatters the light as it enters the eye, blurs images and severely interferes people's daily activities. The only effective therapy is cataract surgery, in which the clouded lens is phacoemulsified and removed. However, an aberrant iris distortion, namely intra-operative floppy iris syndrome (IFIS), is not uncommon in the phacoemulsification process, and it greatly degrades the surgical outcomes. Despite its great impact, the mechanism of IFIS has seldom been explored from the mechanics viewpoint. This study constitutes the first exploration into IFIS mechanism within the torsional-irrigation/aspiration (T-I/A) combined mode, from the perspective of fluid-structure coupling, employing our newly developed fluid-structure interaction (FSI) simulation framework. The impacts of several factors, including probe type and position, irrigation and aspiration (I/A), iris stiffness and lens presence, are evaluated in two different torsional-irrigation/aspiration (T-I/A) combined configurations, corresponding to the scenarios of coaxial and bimanual I/A operations. Results reveal that by altering the probe's location in anterior chamber, three distinct modes of iris dynamics are recognized and defined as repulsion (RP), attraction (AT), and adhesion (AH) modes according to the relative iris-probe location. Among them, RP mode, where the iris is repelled by the probe, is preferred to ensure the safety of the iris. Furthermore, IFIS could be alleviated by stiffening iris, reducing I/A strength and choosing coaxial I/A device. These interventions result in the contraction of the damaging AH zone towards the iris root, occurring at approximately one-fourth (coaxial case), one-fifth (coaxial case), and one-fourth of the iris length, achieved by quadrupling iris stiffness, ceasing I/A flow, and utilizing coaxial I/A device, respectively. However, the risk of IFIS is only marginally impacted by the lens presence. Our findings gain a deeper insight into the iris dynamics in T-I/A mode from fluid-iris interaction viewpoint, which may provide valuable guidance for the surgical protocol operation.

Dexmedetomidine: a real-world safety analysis based on FDA adverse event reporting system database.

Using the FDA adverse event reporting system (FAERS) database to analyze the safety profile of Dexmedetomidine and provide guidance for clinical application. Data from the FAERS database from the first quarter of 2004 to the third quarter of 2023 were collected. Reporting odds ratio (ROR), the proportional reporting ratio (PRR), and the Bayesian confidence propagation neural network (BCPNN) were employed to detect and assess adverse events associated with Dexmedetomidine. A total of 1910 reports of Dexmedetomidine as the primary suspect drug were obtained. After screening, 892 preferred terms were obtained, including 52 new preferred terms not mentioned in the drug insert. The common adverse events of Dexmedetomidine include bradycardia, cardiac arrest, hypotension, diabetes insipidus, arteriospasm coronary and agitation. Notably, cardiac disorders exhibited the highest number of reports and the highest signal intensity in the system organ class. Among the new preferred terms, those with high signal intensity include transcranial electrical motor evoked potential monitoring abnormal, acute motor axonal neuropathy, trigemino-cardiac reflex, glossoptosis, floppy iris syndrome, phaeochromocytoma crisis, postresuscitation encephalopathy and diabetes insipidus. This study mined and evaluated adverse events associated with Dexmedetomidine and also identified new adverse events. This could help alert clinicians to new adverse events not mentioned in the drug inserts, reducing the risk of drug.

Risk factors for a phacodonesis surprise during cataract surgery in patients with pseudoexfoliation.

To evaluate the association of different pre-operative parameters with surprise phacodonesis during cataract surgery among patients with pseudoexfoliation (PXF). This is a retrospective charts review of all PXF patients who underwent cataract surgery between the years 2013 and 2018. Pre-operative parameters (demographics, biometry, intraocular pressure (IOP), endothelial cell count, pupil size, cataract density, glaucoma status, cup to disc ratio, number of glaucoma medications, prior intra-vitreous injections, risk for intraoperative floppy iris syndrome) were compared between patients with and without surprise phacodonesis. Binary logistic regression was used to calculate the predictive value of each parameter. Out of 396 surgical cases with computerized pre-operative assessment, we included 127 eyes of 120 PXF patients without evidence of phacodonesis preoperatively. The mean age was 77.8 ± 12.0 years, 63 (52.7%) were male, and 106 (84.2%) underwent phacoemulsification surgery. We identified 10 cases of surprise phacodonesis during surgery (8.2%). Compared to PXF cases without intraoperative phacodonesis, they had higher pre-operative IOP (23.0 ± 11.0 mmHg vs. 14.9 ± 3.8 mmHg, p < 0.001) and a higher rate of B scan use due to dense cataract obscuring posterior pole evaluation [4 (40%) vs. 15 (12.8%), p = 0.04]. Multivariant binary logistic regression confirmed that only baseline IOP contributed to the prediction of surprise phacodonesis (OR 1.22 CI 1.04-1.43, p = 0.014). Among patients with PXF undergoing cataract surgery, elevated IOP and poor posterior segment visibility requiring B scan use were associated with zonular instability putting these patients at risk for intra-operative complications.

Prospective analysis of anatomic features predisposing patients to intraoperative floppy iris syndrome.

To aid preoperative risk assessment by identifying anatomic parameters corresponding with a higher risk of intraoperative floppy iris syndrome (IFIS) during cataract surgery. Prospective cohort study of 55 patients with α1-adrenergic receptor antagonist (α1-ARA) treatment and 55 controls undergoing cataract surgery. Anterior segment optical coherence tomography (AS-OCT), video pupilometer, and biometry measurements were performed preoperatively and analyzed regarding anatomic parameters that corresponded with a higher rate of IFIS. Those statistically significant parameters were evaluated with logistic regression analysis and receiver operating characteristic (ROC) curve. Pupil diameter was significantly smaller in patients who developed IFIS compared to those who did not develop IFIS (AS-OCT 3.29 ± 0.85 vs. 3.63 ± 0.68, p = 0.03; Pupilometer 3.56 ± 0,87 vs. 3.95 ± 0.67, p = 0.02). Biometric evaluation revealed shallower anterior chambers in the IFIS group (ACD 3.12 ± 0.40 vs. 3.32 ± 0.42, p = 0.02). Cutoff values for 50% IFIS probability (p = 0.5) were PD = 3.18mm for pupil diameter and ACD = 2.93mm for anterior chamber depth. ROC curves of combined parameters were calculated for α1-ARA medication with pupil diameter and anterior chamber depth, which yielded an AUC of 0.75 for all IFIS grades. The combination of biometric parameters with history of α1-ARA medication can improve assessment of risk stratification for IFIS incidence during cataract surgery.

Iris color as a predictive factor for intraoperative floppy iris syndrome.

To assess the influence of iris color on the predisposition for intraoperative floppy iris syndrome (IFIS) during cataract surgery. Medical records of patients who underwent cataract surgery in two medical centers between July 2019 and February 2020 were reviewed. Patients younger than 50years, with preexisting ocular conditions affecting pupillary size or anterior chamber depth (ACD), and combined procedures were excluded. The remaining patients were questioned via telephone regarding their iris color. The association of IFIS occurrence and severity with iris color was tested using univariant and multivariant analyses. Overall, 155 eyes of 155 patients were included, 74 with documented IFIS and 81 without. The mean age was 74.03 ± 7.09years, and 35.5% were female. The most common iris color among study eyes was brown (110/155, 70.97%), followed by blue (25/155, 16.13%) and green (20/155, 12.90%). Compared to brown-colored eyes, blue irises exhibited a 4.50-fold risk for IFIS (OR = 4.50, 95% CI: 1.73-11.70, p = 0.002), and green irises 7.00-fold risk (OR = 7.00, 95% CI: 2.19-22.39, p = 0.001). After adjusting for possible confounders, the results remained statistically significant (p < 0.01). Light-colored irises tended to exhibit a more severe IFIS compared to the brown iris group (p < 0.001). IFIS bilaterality was also affected by iris color (p < 0.001), with a 10.43-fold risk for fellow eye IFIS in the green iris group compared to eyes with brown irises (OR = 10.43, 95% CI: 3.35-32.54, p < 0.001). Light iris color was associated with a significantly increased risk of IFIS occurrence, severity, and bilaterality on univariate and multivariate analysis in this study.

Intraoperative floppy iris syndrome: comparison of two different alpha-adrenergic blockers

Intraoperative floppy iris syndrome: comparison of two different alpha-adrenergic blockers

Prophylaxis Pharmacological Management for Patients with Intraoperative Floppy Iris Syndrome Risk Due to ?1-Adrenergic Receptor Antagonists Use

Introduction: Intraoperative floppy iris syndrome (IFIS) remains a challenge that increases the risk of complications in patients undergoing cataract surgery who use ?1-adrenergic receptor antagonists. To date, no definite consensus on a preventive strategy for IFIS is available. The aim of this review is to assess various pharmacological managements to prevent IFIS in high-risk patients. Methods: This review was based on Preferred Reporting Items for Systematic Reviews and Meta- Analyses guidelines. A systematic search using PubMed, Science Direct, Cochrane Library, and WorldCat database was performed. Quality of each study was evaluated using Cochrane Risk of Bias 2.0 (RoB 2.0), Risk of Bias in Non-randomized Studies of Interventions (ROBINS-I), or Newcastle- Ottawa Scale (NOS). Results: The search identified 1589 articles of which 7 met the eligibility criteria. Experimental and observational studies between 2010 and 2018 were included. Pharmacological managements included in this review are administered in varying routes. Phenylephrine, lidocaine, a combination of lidocaine and epinephrine are given intracamerally. Other pharmacological managements included are sub-tenon injection of lidocaine, topical atropine, a combination of topical atropine with intracameral epinephrine, combined irrigation solution of phenylephrine and ketorolac, and mydriatic cocktail- soaked wick sponges. Conclusion: Various pharmacological managements for IFIS prophylaxis have shown promising potential. However, studies that evaluate the efficacy of each agent and comparison between these strategies are still limited. Further research is needed to determine the best prophylaxis strategy to reduce the incidence of IFIS.

Improved visibility of illuminated chopper-assisted cataract surgery involving iris challenges.

The aim of this study was to evaluate the efficacy of the illuminated chopper-assisted cataract surgery in terms of shortening the surgical time and reducing the use of pupil expansion devices in eyes with iris challenges. This was a retrospective case series of a university hospital. Four hundred forty-three eyes of 433 consecutive patients who underwent illuminated chopper-assisted cataract surgery were included in this study. Cases with preoperative or intraoperative miosis, iris prolapse, and intraoperative floppy iris syndrome were included in the iris challenge group. Use of tamsulosin, iris hooks, pupil size, surgical time, and improved visibility (100/surgical time × pupil size) were compared between eyes with and without iris challenges. Mann-Whitney U test, Pearson's Chi-square test, and Fisher's exact test were used for statistical analysis. Of 443 eyes, 66 were included in the iris challenge group (14.9%). Tamsulosin use was more common in patients with iris challenges and iris hooks were used more frequently (9.1% vs. 0%, P < 0.001) in patients with iris challenges than in those without iris challenges. Pupil size was smaller in patients with iris challenges (6.01 vs. 7.64 mm, P < 0.001). However, surgical time was not different (16.9 vs. 16.5 min, P = 0.064) between the two groups. As a result, improved visibility was calculated to be higher in patients with iris challenges (1.05 vs. 0.81, P < 0.001). In terms of surgical time and improved visibility, using the illuminated chopper simplified cataract surgery involving iris challenges. The use of an illuminated chopper is expected to be a good solution for challenging cataract surgeries.

OPHTHALMIC VISCOSURGICAL DEVICES

Ophthalmic viscoelastic devices (OVDs) are recently used in cataract surgery and have expressivelyupgraded the safety and effectiveness of this surgical procedure. OVDs create and maintain anterior chamber depth and visibility, protecting the corneal endothelium and other intraocular tissues during surgery. The selection of the most adequate OVD is especially relevant when performing cataract surgery in challenging cases, such as in hard, mature cataracts, flat anterior chamber, pseudoexfoliation syndrome, intraoperative floppy iris syndrome, or glaucoma surgery. In such cases, OVD is crucial for facilitating the surgical procedure and the associated minimal complication rate. The use of a combination of OVDs (soft-shell technique and modifications), the use of blue-colored. OVDs, and the combination of sodium hyaluronate with lidocaine have also been described as useful tools in some of these challenging cases.

What is the Real Cost of Intraoperative Floppy Iris Syndrome in Cataract Surgery?

This is a Letter and does not have an abstract. Please download the PDF or view the article in HTML.

Impact of intraoperative floppy IRIS syndrome in cataract surgery by phacoemulsification: Analysis of 622 cases

BackgroundSmall pupil syndromes, including IFIS, increase the risk of complications during cataract surgery if proper surgical planning is not performed. Tamsulosin is associated with a very significant increase in the risk of IFIS, due to the prolonged inactivation of alpha-1 adrenergic receptors in the smooth muscle fiber of the iris. Material and methodsSingle-center prospective observational study, carried out at the Hospital de l'Esperança - Parc de Salut Mar. Results622 eyes of 502 patients were included, of which 337 (62%) were women. The mean age of the sample is 74.8 years. 61 cases of IFIS (11%) were observed, of which 13 received treatment with Tamsulosin and 1 with Doxazosin. 23 cases of IFIS were observed in female patients. The female:male ratio was approximately 1:3. 19 cases (3%) of severe IFIS were observed, of which 6 received treatment with alpha-antagonists, with no statistically significant correlation.The mean surgical time was 13.80 min (Standard Deviation - SD: 4.01 min) in patients without IFIS and 16.93 min (SD: 4.32 min) in patients with IFIS. The relationship between the duration of the surgical procedure in minutes and the presence of IFIS was statistically significant, applying a 'two-tailed' or bilateral t-Student test with a p value of 0.01. ConclusionRegardless of the degree of severity, the diagnosis of IFIS lengthens the surgical time in cataract surgery. This represents yet another piece of evidence that supports the use of less selective alpha-1 adrenergic antagonist treatments than Tamsulosin or the performance of cataract surgery before starting these treatments.

Tunnel-floor entry continuous curvilinear capsulorhexis technique: Rhexis in a controlled and stable anterior chamber always.

Continuous circular capsulorhexis (CCC) was demonstrated independently by Thomas Neuhann, Kimiya Shimizu, and Howard Gimbel in the 1980s and it finds mention in the landmark paper by Gimbel and Neuhann. The authors describe a technique of achieving the rhexis in a stable, viscoelastic-filled anterior chamber using the tunnel floor as the entry. This gets covered by the roof of the tunnel postoperatively and, therefore, does not leak. There is no oar-locking or striae even when cystitome goes beyond the edge of the tunnel. As there is no escape of the viscoelastic substance, there is no change in the pressure or shallowing of the anterior chamber. It is a useful technique for beginners. It is of great help in difficult cases like intumescent cataracts, shallow anterior chambers, hyperopes, nanophthalmos, pseudoexfoliation, small non-dilating pupils, intraoperative floppy iris syndrome (IFIS), and phacomorphic glaucoma.

Floppy iris syndrome associated with specific medication intake: A narrative review.

Intraoperative floppy iris syndrome (IFIS) is a cataract surgery complication that remains a challenge for eye surgeons. It is caused by the antagonism of alfa-1-adrenergic receptors within the dilator muscle of the iris, thus preventing the iris from dilation during a cataract surgery. The long-term blocking alfa-1 adrenergic receptors by the chronic use of a number of systemic medications may lead to permanent anatomical atrophy of the dilator muscle of the iris. The most common drugs associated with the development of IFIS are tamsulosin and other alpha-1 adrenergic receptor antagonists prescribed to patients with low urinary tract symptoms (LUTS). There are other systemic medications that have been reported to have increased risk for IFIS. It is crucial for the ophthalmologist to identify the high-risk patients prone to develop IFIS. Its presence may complicate the course of cataract surgery, ultimately negatively affecting visual outcome. Cataract surgery should be performed by an experienced eye surgeon using alternative pharmacological and surgical techniques. Interdisciplinary cooperation is essential to mitigate potential complications. Patients should be informed by their physicians about the need to report a medication history to their eye specialists, especially before cataract surgery.

Risk of intraoperative floppy iris syndrome among selective alpha-1 blockers—A consistency model of 6,488 cases

Selective α1-blockers are commonly administered to patients with lower urinary tract syndrome and benign prostatic hyperplasia, but may increase the risk of intraoperative floppy iris syndrome (IFIS). The purpose of this study aimed to clarify the risk of IFIS among various selective α1-blockers. Four databases were searched for prospective studies comparing alpha-1-antagonists. Data were pooled using the consistency model, and used risk ratio (RR) and mean difference (MD) for IFIS and pupil diameter, respectively. This study finally included 25 prospective comparative studies. Based on 51 direct comparisons with 6488 cases, risks of IFIS in patients who received tamsulosin [RR, 13.85; 95% confidence interval (CI): 7.34 to 26.11], terazosin (RR, 8.94; 95% CI 2.88 to 27.74), alfuzosin (RR, 7.73; 95% CI: 3.05 to 19.62), and doxazosin (RR, 3.88; 95% CI: 1.13 to 13.28) were significantly higher than those did not receive α1-antagonists. Based on 11 direct comparisons with 564 cases, as compared to no α1-antagonists, patients who received tamsulosin (MD, −0.36; 95% CI: −0.71 to −0.01) and alfuzosin (MD, −0.34; 95% CI: −0.62 to −0.07) showed smaller pupil diameter under mesopic light levels, while those received silodosin did not show significantly smaller mesopic pupil diameter than people without α1-antagonists. IFIS seems to be inevitable with the usage of α1-antagonists, and tamsulosin needs to be cautious due to the significantly higher risk of severe IFIS. With regard to silodosin, there is no strong evidence to support the uses of italthough it does not significantly decrease mesopic pupil diameter.