scholarly journals Visually Evoked Potentials in a Patient with a Fyodorov-Zuev Keratoprosthesis

2015 ◽  
Vol 6 (1) ◽  
pp. 12-17
Author(s):  
Roy Schwartz ◽  
Adiel Barak ◽  
Hadas Newman
Keyword(s):  
Evoked Potential ◽  
Corneal Dystrophy ◽  
Visually Evoked Potentials ◽  
Past Medical History ◽  
Visual Status ◽  
Ahmed Valve ◽  
Pars Plana ◽  
The Right ◽  
Valve Implantation ◽  
Normal Latency

Purpose: To describe a visually evoked potential (VEP) examination performed on a patient with a keratoprosthesis. Methods: We report the case of a 60-year-old patient with a Fyodorov-Zuev keratoprosthesis in the right eye complained of gradual visual deterioration in that eye. His past medical history consisted of failed corneal graft procedures due to corneal dystrophy and an Ahmed valve implantation due to secondary glaucoma. A clinical examination and an ultrasound demonstrated vitreal opacities. In order to assess the visual status, a flash VEP test was conducted. Results: VEP recorded from the right eye consisted of a broadened and poorly formed positive P1 wave, with a subnormal amplitude, but a normal latency. Consequently, the patient underwent a pars plana vitrectomy. Conclusion: This case demonstrates the viability of VEP exams in patients with keratoprostheses.

Physiologic studies of male sexual dysfunction in multiple sclerosis

2001 ◽  
Vol 7 (4) ◽  
pp. 249-254 ◽  
Author(s):  
C C Yang ◽  
J D Bowen ◽  
G H Kraft ◽  
E M Uchio ◽  
B G Kromm
Keyword(s):  
Multiple Sclerosis ◽  
Sexual Dysfunction ◽  
Evoked Potential ◽  
Monitoring Methods ◽  
Electrodiagnostic Testing ◽  
Somatosensory Pathway ◽  
The Right ◽  
Dorsal Nerves ◽  
Normal Latency

Objective: We conducted this investigation to better define the neural disruptions that result in sexual dysfunction in men with multiple sclerosis (MS), using genital electrodiagnostic testing and nocturnal penile tumescence and rigidity monitoring. Methods: Thirteen men with MS and sexual dysfunction were recruited for the study. Twelve healthy, sexually potent men were enrolled as controls. All underwent pudendal somatosensory evoked potential (SEP) testing using standard methods, and a new modification to isolate the right and left dorsal nerves of the penis. RigiScan testing was performed on the MS subjects to assess nocturnal erectile function. Results: Unilateral and bilateral DNP SEPs were able to be performed on the control subjects. In all but one MS subjects, DNP SEP abnormalities were found. Three men had normal latency bilateral DNP SEP latencies, but on unilateral DNP testing, abnormalities were identified. Seven men, including those with abnormal or absent SEP latencies, had normal nocturnal erectile activity. There was no correlation between overall functional status, presence of abnormal or absent SEP, and quality of nocturnal erectile activity. Conclusions: Genital SEP abnormalities are common in men with MS and sexual dysfunction. Unilateral DNP SEP testing was more sensitive in identifying abnormalities than the standard method of pudendal SEP testing. One of the causes of sexual dysfunction in men with MS may be due to genital somatosensory pathway disruption, with sparing of the efferent tracts in some men.

Ahmed Valve Implantation in an Eye with Choroidal Haemangioma

1970 ◽  
Vol 12 (3) ◽  
pp. 169-171
Author(s):  
Norshamsiah Md Din ◽  
Lee M Yueh ◽  
Sumugam S Kala ◽  
Ropilah A Rahman
Keyword(s):  
Intraocular Pressure ◽  
Venous Pressure ◽  
Postoperative Recovery ◽  
Antiglaucoma Medication ◽  
Neuroretinal Rim ◽  
Ahmed Valve ◽  
Weber Syndrome ◽  
Advanced Glaucoma ◽  
The Right ◽  
Valve Implantation

Sturge Weber syndrome is a rare phakomatoses characterised by vascular hamartomas affecting the leptomeninges, and cutaneous and ocular structures. Glaucoma results from angle anomalies, overproductionfrom ciliary body haemangioma, or reduction in aqueous outflow secondary to increased episcleral venous pressure. The presence of a choroidal haemangioma in an eye with advanced glaucoma adds to the complicated postoperative recovery. This report is of a 9-year-old girl with a right-sided facial naevus flammeus who was referred for advanced glaucoma in the right eye. The eye was buphthalmic, her intraocular pressure was 25 mm Hg while using 4 topical antiglaucoma medications, and the visual acuity was 6/36. The optic disc had advanced cupping with a pale neuroretinal rim. Her visual field was severely constricted with fixation splitting. She underwent Ahmed valve implantation with controlled filtration via nylon stenting of the tube. Her postoperative recovery was complicated, and she needed further ligation of the tube to reduce drainage. Six weeks later, her intraocular pressure was controlled at 14 mm Hg without any antiglaucoma medication after removal of the nylon stent. Managing an eye with advanced glaucoma in the presence of a choroidal haemangioma needs meticulous controlled drainage to prevent detrimental postoperative complications.

scholarly journals Simultaneous pars plana vitrectomy, panretinal photocoagulation, cryotherapy, and Ahmed valve implantation for neovascular glaucoma

2021 ◽  
Vol 14 (9) ◽  
pp. 1396-1401
Author(s):  
Carolina Bernal-Morales ◽  
◽  
Alvaro Olate-Perez ◽  
Manuel J. Navarro-Angulo ◽  
Laura Pelegrín ◽  
...  
Keyword(s):  
Pars Plana Vitrectomy ◽  
Case Series ◽  
Neovascular Glaucoma ◽  
Panretinal Photocoagulation ◽  
Vein Occlusion ◽  
Ahmed Valve ◽  
Pars Plana ◽  
Definition Of ◽  
Valve Implantation

AIM: To describe and evaluate the efficacy of Ahmed glaucoma valve implantation (AGV) combined with pars plana vitrectomy (PPV) in a single surgical act for the treatment of advanced neovascular glaucoma (NVG). METHODS: Retrospective observational case series included 51 eyes from 50 patients with severe NVG treated with PPV, AGV, and panretinal photocoagulation and/or cryotherapy in a single surgical act during a 13-year period (2005-2018). Preoperative, intraoperative and postoperative data at day 1 and months 1, 3, 6, 21, and 24 were systematically collected. Definition of surgical success was stablished at IOP between 6 and 21 mm Hg with or without topical treatment. RESULTS: Main indications for surgery were NVG secondary to proliferative diabetic retinopathy (39.2%) and central retinal vein occlusion (37.3%). Mean (±SD) preoperative IOP was 42.0±11.2 mm Hg decreasing to 15.5±7.1 mm Hg at 12mo and 15.8±9.1 mm Hg at 24mo of follow up. Cumulative incidence of success of IOP control was 76.0% at first postoperative month, reaching 88.3% at 6mo. Prevalence of successful IOP control at long term was 74.4% at 12mo and 71.4% at 24mo. Eye evisceration for unsuccessful NVG management was required in 1 case (2.0%). CONCLUSION: Combination of AGV implantation and PPV in a single act may be a suitable option for severe forms of NVG in a case-by-case basis for effective IOP control and a complete panretinal photocoagulation.

Ahmed valve implantation efficiency in children with refractory uveitic glaucoma

2020 ◽  
pp. 144-145
Author(s):  
M.A. Khrabrova ◽  
◽  
L.A. Katargina ◽  
E.V. Denisova ◽  
N.A. Ibaidbahaaeddin ◽  
...  
Keyword(s):  
Uveitic Glaucoma ◽  
Ahmed Valve ◽  
Valve Implantation

Актуальность. Постувеальная глаукома (ПУГ) представляет собой одну из самых тяжелых глауком детского возраста. Имплантации дренажей при ПУГ у детей посвящены лишь единичные работы, а полученные результаты неоднозначны, что требует дальнейшего изучения данного вопроса. Цель. Оценить эффективность имплантации клапана Ахмеда у детей с рефрактерной постувеальной глаукомой (ПУГ). Материал и методы. Имплантация клапана Ахмеда была проведена 10 детям в возрасте от 7 до 17 лет (10 глаз) с некомпенсированной на максимальном гипотензивном режиме открытоугольной или смешанной формой ПУГ. Ранее всем пациентам было выполнено в среднем 2,1±0,9 операций, направленных на нормализацию внутриглазного давления (ВГД). 6 глаз были артифакичными, 2 факичными, 2 афакичными. Имплантация клапана Ахмеда проводилась по общепринятой методике. ВГД на момент операции было в среднем 30,50±4,35 мм рт.ст. Компенсацией глаукомы считали ВГД≤24 мм рт.ст. и отсутствие симптомов прогрессирования глаукомного процесса. Срок наблюдения после операции составил от 3,9 до 23,6 месяцев (в среднем – 14,1±6,5). Результаты. Стойкий гипотензивный эффект вмешательства достигнут в 90% случаев, из них у 3 пациентов без гипотензивного режима, у 6 – на фоне препаратов. Среднее количество гипотензивных препаратов после операции составило 1,7±1,49 (значительно меньше по сравнению с периодом до операции, р=0,028). В конце периода наблюдения среднее значение ВГД составило 18,1±5,34 мм рт.ст. (р=0,008). Во время операции у 1 пациента после парацентеза отмечалось кровотечение из сосудов угла передней камеры, остановленное тампонадой стерильным воздухом. В остальных случаях вмешательство, ближайший и отдаленный послеоперационный период протекали без осложнений. Выводы. Имплантация клапана Ахмеда является эффективным и безопасным способом хирургического лечения рефрактерной ПУГ у детей и может быть рекомендована при неэффективности предшествующих антиглаукоматозных операций, в том числе пациентам с артифакией и афакией.

Postoperative complications after Ahmed valve implantation

2016 ◽  
Vol 12 (2) ◽  
pp. 103-107
Author(s):  
M.M. Bikbov ◽  
◽  
I.I. Husnitdinov ◽  
Keyword(s):  
Postoperative Complications ◽  
Ahmed Valve ◽  
Valve Implantation

scholarly journals Recurrent Intraocular Lens Dislocation in a Patient with Familial Ectopia Lentis

2021 ◽  
Vol 18 (9) ◽  
pp. 4545
Author(s):  
Tomasz K. Wilczyński ◽  
Alfred Niewiem ◽  
Rafał Leszczyński ◽  
Katarzyna Michalska-Małecka
Keyword(s):  
Intraocular Lens ◽  
Pars Plana Vitrectomy ◽  
Vision Loss ◽  
Silicone Oil ◽  
Single Case ◽  
Recurrent Dislocation ◽  
Ectopia Lentis ◽  
Pars Plana ◽  
The Right

A 36-year-old patient presented to the hospital with recurrent dislocation of the intraocular lens (IOL). The patient with the diagnosis of familial ectopia lentis was first operated on for crystalline lens subluxation in the left eye in 2007 and in the right eye in 2009. In both eyes, lens extraction with anterior vitrectomy and transscleral fixation of a rigid IOL was performed. In 2011, the IOL in the right eye luxated into the vitreous cavity due to ocular trauma. The patient underwent a pars plana vitrectomy with the IOL resuturation to the sclera. Seven years later, a spontaneous vision loss in the right eye was caused by a retinal detachment. The pars plana vitrectomy with silicone oil tamponade and a consequential oil removal three months later were performed in 2018. The follow-up examination revealed recurrent IOL dislocation in the same eye. Due to a history of previous suture-related complications a decision was made to remove the subluxated rigid polymethyl-methacrylate (PMMA) IOL and fixate to sclera a sutureless SOLEKO FIL SSF Carlevale lens. The purpose of this report is to present a single case of a 36-year-old patient who was presented to the hospital with recurrent dislocation of the intraocular lens. In a three-month follow-up period, a good anatomical and functional outcome was finally obtained with transscleral sutureless intraocular lens. This lens is an option worth considering especially in a young patient with a long life expectancy and physically active.

scholarly journals Single-Pulse Transcranial Magnetic Stimulation-Evoked Potential Amplitudes and Latencies in the Motor and Dorsolateral Prefrontal Cortex among Young, Older Healthy Participants, and Schizophrenia Patients

2021 ◽  
Vol 11 (1) ◽  
pp. 54
Author(s):  
Yoshihiro Noda ◽  
Mera S. Barr ◽  
Reza Zomorrodi ◽  
Robin F. H. Cash ◽  
Pantelis Lioumis ◽  
...  
Keyword(s):  
Prefrontal Cortex ◽  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Dorsolateral Prefrontal Cortex ◽  
Evoked Potential ◽  
Single Pulse ◽  
Signal Propagation ◽  
Lower Amplitude ◽  
Dorsolateral Prefrontal ◽  
The Right

Background: The combination of transcranial magnetic stimulation (TMS) with electroencephalography (EEG) allows for non-invasive investigation of cortical response and connectivity in human cortex. This study aimed to examine the amplitudes and latencies of each TMS-evoked potential (TEP) component induced by single-pulse TMS (spTMS) to the left motor (M1) and dorsolateral prefrontal cortex (DLPFC) among healthy young participants (YNG), older participants (OLD), and patients with schizophrenia (SCZ). Methods: We compared the spatiotemporal characteristics of TEPs induced by spTMS among the groups. Results: Compared to YNG, M1-spTMS induced lower amplitudes of N45 and P180 in OLD and a lower amplitude of P180 in SCZ, whereas the DLPFC-spTMS induced a lower N45 in OLD. Further, OLD demonstrated latency delays in P60 after M1-spTMS and in N45-P60 over the right central region after left DLPFC-spTMS, whereas SCZ demonstrated latency delays in N45-P60 over the midline and right central regions after DLPFC-spTMS. Conclusions: These findings suggest that inhibitory and excitatory mechanisms mediating TEPs may be altered in OLD and SCZ. The amplitude and latency changes of TEPs with spTMS may reflect underlying neurophysiological changes in OLD and SCZ, respectively. The spTMS administered to M1 and the DLPFC can probe cortical functions by examining TEPs. Thus, TMS-EEG can be used to study changes in cortical connectivity and signal propagation from healthy to pathological brains.

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