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Giovanni Alessio
Ruolo
Professore Straordinario
Organizzazione
Università degli Studi di Bari Aldo Moro
Dipartimento
DIPARTIMENTO DI SCIENZE MEDICHE DI BASE, NEUROSCIENZE ED ORGANI DI SENSO
Area Scientifica
AREA 06 - Scienze mediche
Settore Scientifico Disciplinare
MED/30 - Malattie Apparato Visivo
Settore ERC 1° livello
Non Disponibile
Settore ERC 2° livello
Non Disponibile
Settore ERC 3° livello
Non Disponibile
We describe a technique to stain the anterior lens capsule with micronized triamcinolone to perform a continuous curvilinear capsulorhexis (CCC) during phacoemulsification in the absence of a red reflex due to vitreous hemorrhage. After a self-sealing clear corneal tunnel incision is performed using a 2.75 mm blade, a dispersive ophthalmic viscosurgical device (OVD) is injected to protect the iridocorneal angle. An air bubble as large as possible is injected into the center of the anterior chamber, and a small amount of micronized triamcinolone is then injected as needed to stain the anterior lens capsule. The OVD injection permits the removal of excessive triamcinolone and protects the corneal endothelium from damage during phacoemulsification. A capsulorhexis forceps is used to perform the CCC. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.
To study if cauterization of the scleroconjuctival wound secondary to intravitreal dexamethasone implant in vitrectomized eyes is effective to avoid scleral leakage and hypotony.
Abstract PURPOSE: To describe ultrasound biomicroscopy (UBM) features in a patient with Axenfeld-Rieger syndrome (ARS) and cataract before and after anterior segment surgery using intraocular lens (IOL) and aniridic ring implantation (Morcher Aniridia rings 50 D). METHODS: Visual acuity, subjective glare disability, intraocular pressure, endothelial cell density, and UBM imaging were reviewed over a period of 1 year. RESULTS: One month after surgery, the operated eye showed improved visual acuity and visual comfort, and UBM examination showed a well-centered IOL and well-aligned aniridic ring fins. After 8 months, UBM examination showed contraction of the capsular bag, which appeared wrinkled, fibrous, and thickened. The capsular bag comprised the aniridic ring fins, causing misalignment. The glare disability had dropped from grade 0 to 3. The same outcome was present at 1 year. CONCLUSION: Ultrasound biomicroscopy is a useful noninvasive diagnostic means to picture anatomic details before and after surgery; it suggested that capsular bag shrinking caused migration of the aniridic rings, 8 months after surgery.
Abstract PURPOSE: To analyze corneal confocal microscopy changes after combined photorefractive keratectomy (PRK) plus the cross linking (CXL) procedure. DESIGN: Prospective interventional case series. METHODS: At the Department of Basic Medical Sciences, Neuroscience, and Sense Organs of the University of Bari, Bari, Italy, 17 eyes of 17 patients with progressive keratoconus underwent confocal microscopy examination before and after 1, 3, 6, 12, 18, and 48 months following PRK plus the CXL procedure. The main outcome measures were mean superficial epithelial cell density; mean basal epithelial cell density; mean anterior, mid and posterior keratocyte density; qualitative analysis of stromal backscatter; sub-basal and stromal nerve density parameters; and mean endothelial cell density. RESULTS: During the 4-year follow-up, the mean superficial epithelial cell density, mean basal epithelial cell density and mean endothelial cell density remained unchanged (P > 0.05). The anterior mid-stromal keratocyte density showed a significant decrease (P < 0.05) as compared with preoperative values, and the posterior stromal keratocyte density showed a significant increase at 1 and 3 months of follow-up. Sub-basal and stromal nerve density parameters were significantly decreased until postoperative month 6 (P < 0.05 at 1, 3, and 6 months) and then tended to increase up to preoperative values by the 18th postoperative month. CONCLUSION: Corneal changes after the PRK plus CXL procedures seem to be pronounced and long lasting as far as keratocyte density of the anterior and mid stroma is concerned. Sub-basal nerve densities tend to reach preoperative values 6 months after surgery.
Paclitaxel is a member of the taxane agents that has demonstrated efficacy in ovarian cancer, both in first- and in second-line therapy. Counted among the side-effects of this drug are neurological disorders. In the present study, a rare case of a non-neuropathic ocular disorder, known as cystoid macular edema (CME), due to paclitaxel in patients treated for ovarian cancer is described. Macular edema, or CME, is a common cause of visual impairment that has been classically demonstrated by fluorescein angiograms, showing capillary leakage. CME without fluorescein leakage is rare, and its most common causes are juvenile X-linked retinoschisis, Goldmann-Favre syndrome, and niacin toxicity. At the present time, the mechanism associated with the form of CME that does not exhibit any signs of fluorescein leakage has not been elucidated due to an absence of histopathological studies. Several mechanisms have been proposed, although it is considered to occur due to disruption of the normal blood-retinal barrier by molecules with a molecular weight lower than that of fluorescein, which leads to fluid accumulation in the intracellular space. It is well known that taxane agents cause fluid retention, represented by edema, weight gain, and third-space fluid collection (pericardial, pleural, ascites), and this appears to be associated with their cumulative dose. The present case study confirms that macular edema associated with paclitaxel use exhibits spontaneous resolution following discontinuation of the causative agent. Taxane-associated maculopathy has been scarcely reported in the literature, but the gynecological oncologist should be alert to its possible development, and an ophthalmologic evaluation should be offered to all patients using paclitaxel
Abstract PURPOSE: To evaluate endothelial changes after excimer laser-assisted lamellar keratoplasty. DESIGN: Retrospective, interventional case series. METHODS: Seven eyes of 7 keratoconus patients were evaluated for 1 year after pachymetry-guided lamellar keratoplasty, performed using the iRES Laser (Ligi Tecnologie Medicali S.p.A.), with the Corneal Lamellar Ablation for Transplantation software (Ligi Tecnologie Medicali S.p.A.) procedure. Both anterior segment optical coherence tomography (Visante OCT; Carl Zeiss Meditec, Inc) and in vivo confocal microscopy (Corneal Confocal Microscope CS4; NIDEK Technologies) images were collected. RESULTS: Changes in morphologic features were investigated and the endothelium was assessed quantitatively in all 7 patients. In 6 eyes, we measured a mean residual bed thickness of 151.3 +/- 5.46 microm, and a mean endothelial cell density loss of 5.38% at 1 year after surgery, as compared with preoperative values. The mean percentage hexagonality change was 15.67%, and the mean coefficient of variation change was -21.11%. In 1 eye, a residual bed thickness of 72 microm was found and endothelial loss after 1 year was 72.26%; assessment of the coefficient of variation and percentage hexagonality by manual Confoscan4 software (NIDEK Technologies) was not practicable in this case. CONCLUSIONS: Our results showed that the Corneal Lamellar Ablation for Transplantation procedure induced mild changes to the endothelium in corneas with a mean residual bed thickness of 151.3 +/- 5.46 microm, but serious damage in one eye with a residual bed thickness of 72 microm.
To study the efficacy of a single intravitreal injection of air as a valuable alternative to current treatment options (conservative, pharmacological, and surgical) in patients with symptomatic, focal vitreomacular traction.
Purpose: To study the efficacy of a single 0.7 mg dexamethasone intravitreal implant in vitrectomized eyes with refractory macular edema secondary to combined cataract extraction and macular pucker removal. Methods: In 8 eyes of 8 consecutive patients with refractory macular edema secondary to combined cataract extraction and 25-gauge vitrectomy with internal limiting membrane peeling for macular pucker removal, the injection of the 0.7 mg dexamethasone implant was performed. Best-corrected visual acuity, central retinal thickness measured by spectral domain optical coherence tomography, and intraocular pressure were evaluated at baseline, 1 month, and 6 months. Results: After a mean follow-up of 6.75 +/- 0.71 months, best-corrected visual acuity was significantly increased (P < 0.0001) from 20/50 to 20/23 (P < 0.0001), mean central retinal thickness decreased significantly from 439 +/- 45 [mu]m to 296 +/- 49 [mu]m (P < 0.0001), and intraocular pressure changed significantly (P = 0.02) from 14.63 +/- 1.19 to 16 +/- 0.93. In no case postoperative hypotony or other complication was observed. Conclusion: A single injection of the 0.7 mg dexamethasone intravitreal implant resulted effective in the treatment of refractory macular edema secondary to combined cataract extraction and vitrectomy for macular pucker removal allowing a stable visual acuity recovery.
To analyze morphologic and functional changes after inverted internal limiting membrane-flap technique for optic disk pit maculopathy using optical coherence tomography, multifocal electroretinography, and microperimetry.
The study aim was to evaluate the acute hemodynamic effects of intranasal 17-beta-estradiol on ophthalmic arterial circulation in postmenopausal women. METHODS: Twenty-one healthy women in natural menopause for at least 6 months (mean age: 53.2± 2.9 years) were investigated. Each patient received 300 µg intranasal 17-beta-estradiol. We evaluated the heart rate, systolic and diastolic blood pressure, ophthalmic artery velocity at systolic and diastolic peak and its flow curve integral (FCI) before and 30, 60 and 180 minutes after the administration of the drug. RESULTS: At all time points, the ophthalmic artery FCI showed statistically significant variations (p<0.001) of velocity (cm/sec) compared to T0 (speed recorded at baseline before drug administration). Moreover, systolic blood pressure, diastolic blood pressure and heart rate did not significantly differ each other after drug administration. CONCLUSIONS: Administration of a single dose of intranasal 17-beta-estradiol to healthy postmenopausal women increases ophthalmic artery perfusion.
PURPOSE: To compare visual, refractive, topographic, and corneal higher-order aberration outcome at the 2-year follow-up after customized photorefractive keratectomy (PRK) followed by cross-linking (CXL) as a single procedure versus CXL alone in eyes with progressive keratoconus. DESIGN: Prospective, interventional, nonrandomized clinical trial. METHODS: Seventeen patients (34 eyes) with progressive keratoconus were assigned to 2 groups: the worse eye (17 eyes) was assigned to the PRK plus CXL group and the better eye (17 fellow eyes) was assigned to the CXL group. RESULTS: In the PRK plus CXL group, uncorrected distance acuity improved significantly, from a mean ± standard deviation of 0.63 ± 0.36 logarithm of the minimal angle of resolution (logMAR) units to 0.19 ± 0.17 logMAR units (P < .05) and best distance acuity from 0.06 ± 0.08 logMAR to 0.03 ± 0.06 logMAR (P < .05). Manifest refraction spherical equivalent and spherical and cylindrical power improved significantly (P < .05). Simulated keratometry, flattest, steepest, average, cylindrical, apex keratometry, and inferior-superior value decreased significantly (P < .05). Total and coma-like aberrations significantly decreased for all pupil diameters (P < .05). In the CXL group, uncorrected distance acuity improved, but not significantly, from 0.59 ± 0.29 logMAR units to 0.52 ± 0.29 logMAR units, and best distance acuity improved from 0.06 ± 0.11 logMAR units to 0.04 ± 0.07 logMAR units (P > .05). Manifest refraction spherical equivalent and cylindrical power improvement was not significant (P > .05), unlike spherical power (P < .05). Steepest simulated keratometry, average simulated keratometry, and inferior-superior value significantly decreased (P < .05), unlike flattest simulated keratometry, cylindrical simulated keratometry, and apex keratometry (P > .05). Total and coma-like aberrations were not decreased significantly for all pupil diameters (P > .05). No significant endothelial changes were observed in either group. CONCLUSIONS: The PRK plus CXL procedure may be a good option to reduce corneal aberrations and stabilize corneas with progressive keratoconus.
Von Hippel-Lindau (VHL) disease is a dominantly inherited condition associated with tumors in multiple organs, whose treatment requires heightened multidisciplinary teamwork. Therefore, a document summarizing all the pertinent knowledge is needed to enhance coordination of care.
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