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Sian E Handley, Dorothy A Thompson, Katrina L Prise, Alki Liasis
PURPOSE: To highlight the importance of simultaneous flash electroretinogram (ERG) and visual evoked potential (VEP) recording to differentiate a true flash VEP response from an artefact caused by the intrusion of the ERG on a mid-frontal reference electrode in cases of severe cerebral visual impairment (CVI). METHODS: We report an observational case series of four children with severe CVI who underwent simultaneous flash ERG and VEP recordings. Flash VEPs from Oz-Fz and lower lid skin ERGs referred to Fz were recorded simultaneously to Grass intensity setting 4 flash stimulation...
May 3, 2018: Documenta Ophthalmologica. Advances in Ophthalmology
Leo Sheck, Wayne I L Davies, Phillip Moradi, Anthony G Robson, Neruban Kumaran, Alki C Liasis, Andrew R Webster, Anthony T Moore, Michel Michaelides
PURPOSE: To investigate and describe in detail the demographics, functional and anatomic characteristics, and clinical course of Leber congenital amaurosis (LCA) associated with mutations in the CEP290 gene (LCA-CEP290) in a large cohort of adults and children. DESIGN: Retrospective case series. PARTICIPANTS: Patients with mutations in CEP290 identified at a single UK referral center. METHODS: Review of case notes and results of retinal imaging (color fundus photography, fundus autofluorescence [FAF] imaging, OCT), electrophysiologic assessment, and molecular genetic testing...
February 2, 2018: Ophthalmology
Anthony J Deegan, Faezeh Talebi-Liasi, Shaozhen Song, Yuandong Li, Jingjiang Xu, Shaojie Men, Michi M Shinohara, Mary E Flowers, Stephanie J Lee, Ruikang K Wang
BACKGROUND: In clinical dermatology, the identification of subsurface vascular and structural features known to be associated with numerous cutaneous pathologies remains challenging without the use of invasive diagnostic tools. OBJECTIVE: To present an advanced optical coherence tomography angiography (OCTA) method to directly visualize capillary-level vascular and structural features within skin in vivo. METHODS: An advanced OCTA system with a 1310 nm wavelength was used to image the microvascular and structural features of various skin conditions...
March 2018: Lasers in Surgery and Medicine
E Ariel, E Elliott, J I Meddings, J Miller, M B Santos, L Owens
Ranaviruses have been isolated from many ectothermic vertebrates, and serological surveys of both amphibians and reptiles have shown the presence of ranaviral antibodies in a proportion of these populations. An enzyme-linked immunosorbent assay (ELISA) was developed to measure serum antibodies against ranavirus in Australian reptiles. The ELISA was validated with serum from challenge trials with Bohle iridovirus (BIV) in 6 reptilian species. A preliminary sero-survey of northern Queensland riparian reptile fauna (saw-shelled turtles Myuchelys latisternum, Krefft's river turtles Emydura macquarii krefftii, freshwater crocodiles Crocodylus johnstoni, as well as the snakes Boiga irregularis, Dendrelaphis punctulatus, Tropidonophis mairii, Morelia spilota, Liasis childreni and L...
November 21, 2017: Diseases of Aquatic Organisms
Faezeh Talebi Liasi, Ravikant Samatham, Steven L Jacques
Assessing the metabolic activity of a tissue, whether normal, damaged, aged, or pathologic, is useful for diagnosis and evaluating the effects of drugs. This report describes a handheld optical fiber probe that contacts the skin, applies pressure to blanch the superficial vascular plexus of the skin, then releases the pressure to allow refill of the plexus. The optical probe uses white light spectroscopy to record the time dynamics of blanching and refilling. The magnitude and dynamics of changes in blood content and hemoglobin oxygen saturation yield an estimate of the oxygen consumption rate (OCR) in units of attomoles per cell per second...
November 2017: Journal of Biomedical Optics
Kaajal D Nanda, Eve Lacey, Alki Liasis, Ken K Nischal
PURPOSE: To report four cases of early onset sixth-nerve palsy all of whom had eccentric fixation. METHODS: A retrospective case note review was undertaken of all cases presenting to the senior author's private and NHS practice with early onset sixth palsy between 2006 and 2012. As well as demographic information, details of ophthalmic, orthoptic, electrophysiological examinations, and radiological investigations that were extracted from the records. RESULTS: Four children with unilateral or asymmetric early onset sixth-nerve palsy were identified, of which three were congenital...
January 2017: American Orthoptic Journal
Faezeh Talebi-Liasi, Michi M Shinohara
We present a case of tissue invasive Trichophyton rubrum (T. rubrum) histologically mimicking blastomycosis in a patient with kidney transplant on chronic immunosuppression. Invasive dermatophyte infections are rare, and present a diagnostic challenge to the dermatopathologist due to atypical clinical and histopathological presentations.
June 19, 2017: Journal of Cutaneous Pathology
M Ashwin Reddy, Zishan Naeem, Catriona Duncan, Fergus Robertson, Jane Herod, Adam Rennie, Alki Liasis, Dorothy Ann Thompson, Mandeep Sagoo
BACKGROUND: Intra-arterial chemotherapy (IAC) for retinoblastoma has been documented as causing visual loss and ocular motility problems. A lack of safety data has precluded its acceptance in all centres. METHODS: Retrospective cohort study of patients with retinoblastoma from 2013 to 2015 who had a healthy foveola and relapsed following systemic chemotherapy. All required IAC. The correlation of complications with doses of melphalan +/- topotecan used and putative catheterisation complications was assessed...
December 2017: British Journal of Ophthalmology
Sian E Handley, Vasiliki S Panteli, Alki Liasis
Trans-synaptic retrograde degeneration (TRD) in the human visual system has been established. However there are few studies demonstrating macular thinning of the Retinal Ganglion cell Layer and/or Inner Plexiform layer (RGCL-IPL), corresponding to an acquired homonymous hemianopia. We report a 17 year old with a homonymous hemianopia, secondary to a hemispherectomy for intractable epilepsy. Three years following hemispherectomy, Optical Coherence Tomography (OCT) revealed evidence of TRD, corresponding to his complete homonymous hemianopia...
April 2017: Neuro-ophthalmology
Sian E Handley, Faraneh Vargha-Khadem, Richard J Bowman, Alki Liasis
PURPOSE: To investigate visual function in adults post hemispherectomy in childhood. DESIGN: Noncomparative case series. METHODS: All participants underwent visual acuity, binocular function, visual field, optical coherence tomography (OCT) of the retinal nerve fiber layer (RNFL), and monocular pattern reversal visually evoked potentials (prVEP). PARTICIPANTS: Six adults who had a hemispherectomy in childhood (median 21...
May 2017: American Journal of Ophthalmology
Sian E Handley, Alki C Liasis
PURPOSE: To demonstrate how multichannel visual evoked potentials (VEPs) can provide quantitative measures of visual function in children with marked cortical anatomy abnormalities. METHODS: Four children with marked brain pathology (2 holoprosencephaly, 2 giant interhemispheric cysts with hydrocephalus) underwent pattern reversal and flash VEP recordings from 16 equally distributed electrodes. Voltage maps of the major VEP components were constructed, and their distributions were compared to the magnetic resonance imaging (MRI) findings...
February 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
Charis-Konstantina Kontopoulou, Epifanios Liasis, Pietro Pm Iannetta, Anastasia Tampakaki, Dimitrios Savvas
BACKGROUND: Testing rhizobial inoculation of common bean (Phaseolus vulgaris L.) in hydroponics enables accurate quantification of biological N2 fixation (BNF) and provides information about the potential of reducing inorganic N fertilizer use. In view of this background, common bean grown on pumice was inoculated with Rhizobium tropici CIAT899 (Rt) and supplied with either full-N (total nitrogen 11.2 mmol L-1 ), 1/3 of full-N or N-free nutrient solution (NS). BNF was quantified at the early pod-filling stage using the15 N natural abundance method...
October 2017: Journal of the Science of Food and Agriculture
Maria Flynn, Alki Liasis, Mark Gardner, Tony Towell
Mismatch negativity (MMN) has been characterised as a 'pre-attentive' component of an event-related potential (ERP) that is related to discrimination and error prediction processes. The aim of the current experiment was to establish whether visual MMN could be recorded to briefly presented, backward and forward masked visual stimuli, given both below and above levels of subjective experience. Evidence of visual MMN elicitation in the absence of the ability to consciously report stimuli would provide strong evidence for the automaticity of the visual MMN mechanism...
February 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Lampros Liasis, George Malietzis, George Galyfos, Thanos Athanasiou, Harry T Papaconstantinou, Fragiska Sigala, Georgios Zografos, Konstantinos Filis
Lower limb ischemia in diabetic patients is a result of macro- and microcirculation dysfunction. Diabetic patients undergoing limb amputation carry high mortality and morbidity rates, and decision making concerning the level of amputation is critical. Aim of this study is to evaluate a novel microdialysis technique to monitor tissue microcirculation preoperatively and predict the success of limb amputation in such patients. Overall, 165 patients with type 2 diabetes mellitus undergoing lower limb amputation were enrolled...
November 2016: Wound Repair and Regeneration
Lampros Liasis, Harry T Papaconstantinou
External hemorrhoidal skin tags are generally benign. Colorectal cancer metastases to the squamous epithelium of perianal skin tags without other evidence of disseminated disease is a very rare finding. We present the case of a 61-year-old man with metastasis to an external hemorrhoidal skin tag from a midrectal primary adenocarcinoma. This case report highlights the importance of close examination of the anus during surgical planning for colorectal cancers. Abnormal findings of the perianal skin suggesting an implant or metastatic disease warrant biopsy, as distal spread and seeding can occur...
April 2016: Proceedings of the Baylor University Medical Center
Monika-Filitsa Xenikou, Spyretta Golemati, Aimilia Gastounioti, Marianna Tzortzi, Nektarios Moraitis, Georgios Charalampopulos, Nicolaos Liasis, Athanasios Dedes, Nicolaos Besias, Konstantina S Nikita
Valid characterization of carotid atherosclerosis (CA) is a crucial public health issue, which would limit the major risk held by CA for both patient safety and state economies. CA is typically diagnosed and assessed using duplex ultrasonography (US). Elastrography Imaging (EI) is a promising US technique for quantifying tissue elasticity (ES). In this work, we investigated the association between ES of carotid atherosclerotic lesions, derived from EI, and texture indices, calculated from US image analysis...
2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
S Bokhari, M Kulendran, L Liasis, K Qurashi, M Sen, S Gould
INTRODUCTION: Emergency surgery is changing rapidly with a greater workload, early subspecialisation and centralisation of emergency care. We describe the impact of a novel emergency surgical unit (ESU) on the definitive management of patients with gallstone pancreatitis (GSP). METHODS: A comparative audit was undertaken for all admissions with GSP before and after the introduction of the ESU over a six-month period. The impact on compliance with British Society of Gastroenterology (BSG) guidelines was assessed...
May 2015: Annals of the Royal College of Surgeons of England
Niichiro Abe, Katsuki Matsubara, Kenichi Tamukai, Yasutsugu Miwa, Kazutoshi Takami
Sarcocystis nesbitti, using snakes as the definitive host, is a causative agent of acute human muscular sarcocystosis in Malaysia. Therefore, it is important to explore the distribution and prevalence of S. nesbitti in snakes. Nevertheless, epizootiological information of S. nesbitti in snakes remains insufficient because few surveys have assessed Sarcocystis infection in snakes in endemic countries. In Japan, snakes are popular exotic pet animals that are imported from overseas, but the degree of Sarcocystis infection in them remains unclear...
August 2015: Parasitology Research
Robert Zivadinov, Stefano Bastianello, Michael D Dake, Hector Ferral, E Mark Haacke, Ziv J Haskal, David Hubbard, Nikolaos Liasis, Kenneth Mandato, Salvatore Sclafani, Adnan H Siddiqui, Marian Simka, Paolo Zamboni
Under the auspices of the International Society for Neurovascular Disease (ISNVD), four expert panel committees were created from the ISNVD membership between 2011 and 2012 to determine and standardize noninvasive and invasive imaging protocols for detection of extracranial venous abnormalities indicative of chronic cerebrospinal venous insufficiency (CCSVI). The committees created working groups on color Doppler ultrasound (US), magnetic resonance (MR) imaging, catheter venography (CV), and intravascular US...
November 2014: Journal of Vascular and Interventional Radiology: JVIR
Akash Kumar, Max Dougherty, Gregory M Findlay, Madeleine Geisheker, Jason Klein, John Lazar, Heather Machkovech, Jesse Resnick, Rebecca Resnick, Alexander I Salter, Faezeh Talebi-Liasi, Christopher Arakawa, Jacob Baudin, Andrew Bogaard, Rebecca Salesky, Qian Zhou, Kelly Smith, John I Clark, Jay Shendure, Marshall S Horwitz
Even in cases where there is no obvious family history of disease, genome sequencing may contribute to clinical diagnosis and management. Clinical application of the genome has not yet become routine, however, in part because physicians are still learning how best to utilize such information. As an educational research exercise performed in conjunction with our medical school human anatomy course, we explored the potential utility of determining the whole genome sequence of a patient who had died following a clinical diagnosis of idiopathic pulmonary fibrosis (IPF)...
2014: PloS One
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