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Papers by Nicolás Rivera Valdivia

Research paper thumbnail of Silicone oil retention sutures in a patient with open ocular trauma associated with aniridia and complicated retinal detachment: a case report

Research paper thumbnail of Surgical success in the management of retinal detachment secondary to a giant retinal tear

Ophthalmology Journal

Giant retinal tears (GRT) are defined as full-thickness circumferential tears of more than 90 deg... more Giant retinal tears (GRT) are defined as full-thickness circumferential tears of more than 90 degrees of the retina associated with vitreous detachment [1]. The incidence of GRT is rare and is associated with rhegmatogenous retinal detachments (RD) in approximately 1.5% of cases [2]. Although GRT can be idiopathic, it's often associated with various comorbidities, such as ocular trauma, high myopia, aphakia, pseudophakia, collagen-related genetic mutations, young age, and male sex [1, 3, 4]. Innovations in micro incisional surgery and surgical supplies have improved the prognosis of patients with GRT [5]. The use of perfluorocarbon this article is available in open access under Creative Common attribution-Non-Commercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially

Research paper thumbnail of Building Programs to Eradicate Toxoplasmosis Part III: Epidemiology and Risk Factors

Current Pediatrics Reports

Purpose of Review Review comprehensive data on rates of toxoplasmosis in Panama and Colombia. Rec... more Purpose of Review Review comprehensive data on rates of toxoplasmosis in Panama and Colombia. Recent Findings Samples and data sets from Panama and Colombia, that facilitated estimates regarding seroprevalence of antibodies to Toxoplasma and risk factors, were reviewed. Summary Screening maps, seroprevalence maps, and risk factor mathematical models were devised based on these data. Studies in Ciudad de Panamá estimated seroprevalence at between 22 and 44%. Consistent relationships were found between higher prevalence rates and factors such as poverty and proximity to water sources. Prenatal screening rates for anti-Toxoplasma antibodies were variable, despite existence of a screening law. Heat maps showed a correlation between proximity to bodies of water and overall Toxoplasma seroprevalence. Spatial epidemiological maps and mathematical models identify specific regions that could most benefit from comprehensive, preventive healthcare campaigns related to congenital toxoplasmosis ...

Research paper thumbnail of Retinal pigment epithelium atrophy after epiretinal membrane and internal limiting membrane peeling: case reports

romanian journal of ophthalmology

This is an open-access article distributed under the terms of the Creative Commons Attribution Li... more This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Research paper thumbnail of Oftalmía nodosa en el trópico

Revista de la Sociedad Colombiana de Oftalmología, 2022

La oftalmía nodosa (ON) fue descrita por primera vez por Schön en 1861, y desde entonces ha recib... more La oftalmía nodosa (ON) fue descrita por primera vez por Schön en 1861, y desde entonces ha recibido múltiples nombres, ampliando la identificación de los agentes causales. En Colombia no se tienen referencias precisas sobre dichos agentes. Objetivo: Realizar revisión de tema sobre una enfermedad subdiagnosticada como la ON.

Research paper thumbnail of High frequency of ocular toxoplasmosis in Quindío, Colombia and risk factors related to the infection

Heliyon, 2021

To determine the frequency of retinochoroidal lesions by ocular toxoplasmosis and their relations... more To determine the frequency of retinochoroidal lesions by ocular toxoplasmosis and their relationships with risk factors, in residents of two districts with high exposure to Toxoplasma, in Armenia-Quindío, Colombia. Methods: Cross-sectional analyses of fundoscopy screening, serological tests, and questionnaires were performed to determine risk factors associated with ocular toxoplasmosis retinochoroidal lesions. Differences in proportions were analyzed using the chi-squared test. Results: Of 161 individuals examined, 17 (10.5%) exhibited retinochoroidal scars suggestive of old inactive Toxoplasma gondii infection. All 17 individuals were seropositive for T. gondii antibodies. Consumption of bottled water was protective against T. gondii infection among individuals in this study. There were no specific epidemiological risk factors associated with ocular toxoplasmosis retinochoroidal lesions. Conclusion: Ocular toxoplasmosis is an important cause of visual impairment in Armenia-Quindío, Colombia. The consumption of boiled or bottled water is a major preventive public health measure to reduce infection by T. gondii and the subsequent onset of OT.

Research paper thumbnail of Surgical treatment of vitreoretinal complications in a patient with Stickler syndrome type 1: a case report

Ophthalmology Journal, 2021

We present the clinical case of an 8-years-old male patient with a genetic diagnosis of Stickler ... more We present the clinical case of an 8-years-old male patient with a genetic diagnosis of Stickler syndrome type 1 and the management of associated vitreoretinal complications. The patient had an antecedent of no light perception in his left eye secondary to retinal detachment treated in another health centre. He consulted with a history of blunt trauma in his head with an unremarkable anterior segment and fundus exam. Scleral indentation showed no lesions to be treated in the right eye. We recommended follow-up every six months. The patient did not come to controls. He was consulted three years later because of visual loss in his right eye. Fundus showed a total retinal detachment secondary to a giant retinal tear of 320º with macular involvement and choroidal detachments. Therefore, scleral buckling, lensectomy, pars plana vitrectomy, inferior retinectomy, endovenous laser treatment (endolaser), and silicone oil tamponade were performed. After six weeks of follow-up, the patient presented an inferior re-detachment with grade C3 vitreoretinal proliferation. A new procedure of silicone oil removal, epiretinal membrane removal, enlargement of inferior retinectomy, endolaser, and silicone oil tamponade was indicated. After 6-months of follow-up, no new retinal detachment was presented, and the best-corrected visual acuity was 20/100.

Research paper thumbnail of Nd:YAG membranotomy for sub-inner limiting membrane hemorrhage: a case report

romanian journal of ophthalmology, 2021

This is an open-access article distributed under the terms of the Creative Commons Attribution Li... more This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Research paper thumbnail of Severe sequelae in bilateral acute iris transillumination syndrome secondary to the use of oral moxifloxacin: a case report

Journal of Medical Case Reports, 2021

Background Moxifloxacin is a fourth-generation fluoroquinolone used as a second-line treatment fo... more Background Moxifloxacin is a fourth-generation fluoroquinolone used as a second-line treatment for multiple bacterial infections. Uveitis has been described as an adverse effect related to this medication. Although several case reports have been published describing uveitis and bilateral acute iris transillumination syndrome related to moxifloxacin, we present a unique case of a patient with severe sequelae associated with bilateral acute iris transillumination syndrome secondary to the use of oral moxifloxacin. Case presentation A 45-year-old Colombian hispanic female presented bilateral conjunctival hyperemia, decreased visual acuity, blurred vision, photophobia, and ocular pain after 15 days of treatment with systemic moxifloxacin for an upper tract respiratory infection. The patient presented unilateral anterior chamber pigment dispersion, mydriatic and nonreactive pupils, extensive iris transillumination defects, and secondary glaucoma. Blood and aqueous humor tests were negati...

Research paper thumbnail of Silicone oil retention sutures in a patient with open ocular trauma associated with aniridia and complicated retinal detachment: a case report

Research paper thumbnail of Surgical success in the management of retinal detachment secondary to a giant retinal tear

Ophthalmology Journal

Giant retinal tears (GRT) are defined as full-thickness circumferential tears of more than 90 deg... more Giant retinal tears (GRT) are defined as full-thickness circumferential tears of more than 90 degrees of the retina associated with vitreous detachment [1]. The incidence of GRT is rare and is associated with rhegmatogenous retinal detachments (RD) in approximately 1.5% of cases [2]. Although GRT can be idiopathic, it's often associated with various comorbidities, such as ocular trauma, high myopia, aphakia, pseudophakia, collagen-related genetic mutations, young age, and male sex [1, 3, 4]. Innovations in micro incisional surgery and surgical supplies have improved the prognosis of patients with GRT [5]. The use of perfluorocarbon this article is available in open access under Creative Common attribution-Non-Commercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially

Research paper thumbnail of Building Programs to Eradicate Toxoplasmosis Part III: Epidemiology and Risk Factors

Current Pediatrics Reports

Purpose of Review Review comprehensive data on rates of toxoplasmosis in Panama and Colombia. Rec... more Purpose of Review Review comprehensive data on rates of toxoplasmosis in Panama and Colombia. Recent Findings Samples and data sets from Panama and Colombia, that facilitated estimates regarding seroprevalence of antibodies to Toxoplasma and risk factors, were reviewed. Summary Screening maps, seroprevalence maps, and risk factor mathematical models were devised based on these data. Studies in Ciudad de Panamá estimated seroprevalence at between 22 and 44%. Consistent relationships were found between higher prevalence rates and factors such as poverty and proximity to water sources. Prenatal screening rates for anti-Toxoplasma antibodies were variable, despite existence of a screening law. Heat maps showed a correlation between proximity to bodies of water and overall Toxoplasma seroprevalence. Spatial epidemiological maps and mathematical models identify specific regions that could most benefit from comprehensive, preventive healthcare campaigns related to congenital toxoplasmosis ...

Research paper thumbnail of Retinal pigment epithelium atrophy after epiretinal membrane and internal limiting membrane peeling: case reports

romanian journal of ophthalmology

This is an open-access article distributed under the terms of the Creative Commons Attribution Li... more This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Research paper thumbnail of Oftalmía nodosa en el trópico

Revista de la Sociedad Colombiana de Oftalmología, 2022

La oftalmía nodosa (ON) fue descrita por primera vez por Schön en 1861, y desde entonces ha recib... more La oftalmía nodosa (ON) fue descrita por primera vez por Schön en 1861, y desde entonces ha recibido múltiples nombres, ampliando la identificación de los agentes causales. En Colombia no se tienen referencias precisas sobre dichos agentes. Objetivo: Realizar revisión de tema sobre una enfermedad subdiagnosticada como la ON.

Research paper thumbnail of High frequency of ocular toxoplasmosis in Quindío, Colombia and risk factors related to the infection

Heliyon, 2021

To determine the frequency of retinochoroidal lesions by ocular toxoplasmosis and their relations... more To determine the frequency of retinochoroidal lesions by ocular toxoplasmosis and their relationships with risk factors, in residents of two districts with high exposure to Toxoplasma, in Armenia-Quindío, Colombia. Methods: Cross-sectional analyses of fundoscopy screening, serological tests, and questionnaires were performed to determine risk factors associated with ocular toxoplasmosis retinochoroidal lesions. Differences in proportions were analyzed using the chi-squared test. Results: Of 161 individuals examined, 17 (10.5%) exhibited retinochoroidal scars suggestive of old inactive Toxoplasma gondii infection. All 17 individuals were seropositive for T. gondii antibodies. Consumption of bottled water was protective against T. gondii infection among individuals in this study. There were no specific epidemiological risk factors associated with ocular toxoplasmosis retinochoroidal lesions. Conclusion: Ocular toxoplasmosis is an important cause of visual impairment in Armenia-Quindío, Colombia. The consumption of boiled or bottled water is a major preventive public health measure to reduce infection by T. gondii and the subsequent onset of OT.

Research paper thumbnail of Surgical treatment of vitreoretinal complications in a patient with Stickler syndrome type 1: a case report

Ophthalmology Journal, 2021

We present the clinical case of an 8-years-old male patient with a genetic diagnosis of Stickler ... more We present the clinical case of an 8-years-old male patient with a genetic diagnosis of Stickler syndrome type 1 and the management of associated vitreoretinal complications. The patient had an antecedent of no light perception in his left eye secondary to retinal detachment treated in another health centre. He consulted with a history of blunt trauma in his head with an unremarkable anterior segment and fundus exam. Scleral indentation showed no lesions to be treated in the right eye. We recommended follow-up every six months. The patient did not come to controls. He was consulted three years later because of visual loss in his right eye. Fundus showed a total retinal detachment secondary to a giant retinal tear of 320º with macular involvement and choroidal detachments. Therefore, scleral buckling, lensectomy, pars plana vitrectomy, inferior retinectomy, endovenous laser treatment (endolaser), and silicone oil tamponade were performed. After six weeks of follow-up, the patient presented an inferior re-detachment with grade C3 vitreoretinal proliferation. A new procedure of silicone oil removal, epiretinal membrane removal, enlargement of inferior retinectomy, endolaser, and silicone oil tamponade was indicated. After 6-months of follow-up, no new retinal detachment was presented, and the best-corrected visual acuity was 20/100.

Research paper thumbnail of Nd:YAG membranotomy for sub-inner limiting membrane hemorrhage: a case report

romanian journal of ophthalmology, 2021

This is an open-access article distributed under the terms of the Creative Commons Attribution Li... more This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Research paper thumbnail of Severe sequelae in bilateral acute iris transillumination syndrome secondary to the use of oral moxifloxacin: a case report

Journal of Medical Case Reports, 2021

Background Moxifloxacin is a fourth-generation fluoroquinolone used as a second-line treatment fo... more Background Moxifloxacin is a fourth-generation fluoroquinolone used as a second-line treatment for multiple bacterial infections. Uveitis has been described as an adverse effect related to this medication. Although several case reports have been published describing uveitis and bilateral acute iris transillumination syndrome related to moxifloxacin, we present a unique case of a patient with severe sequelae associated with bilateral acute iris transillumination syndrome secondary to the use of oral moxifloxacin. Case presentation A 45-year-old Colombian hispanic female presented bilateral conjunctival hyperemia, decreased visual acuity, blurred vision, photophobia, and ocular pain after 15 days of treatment with systemic moxifloxacin for an upper tract respiratory infection. The patient presented unilateral anterior chamber pigment dispersion, mydriatic and nonreactive pupils, extensive iris transillumination defects, and secondary glaucoma. Blood and aqueous humor tests were negati...