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1.
Pediatr Cardiol ; 44(2): 297-305, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36255468

RESUMO

Chylothorax is a life-threatening complication post-corrective congenital heart surgery. Octreotide is used for treatment of refractory chylothoraces, with no standardized treatment protocol and a paucity of literature describing its efficacy. Our aim was to provide an update on the safety and efficacy of octreotide for the treatment of refractory chylothoraces in neonatal and pediatric patients' post-corrective congenital heart surgery. We performed a systematic review of PubMed, Medline, CINAHL, and Cochrane Library databases. Only intravenous octreotide treatment was included. A total of 621 patients across 27 studies were included. Studies included were 11 case series, 5 case studies, and 11 retrospective cohort studies. Variation in treatment regimens were reported. Treatment efficacy was reported in 95% (23/27) of studies. Definitions of treatment efficacy were reported in 33% (9/27) of studies. No prospective or randomized control trials were available for inclusion. Octreotide efficacy is widely reported despite a lack of standardization on criteria for treatment initiation or what defines an appropriate response to therapy.Please check and confirm whether the edit made to the article title is in order.Yes.


Assuntos
Quilotórax , Cardiopatias Congênitas , Recém-Nascido , Humanos , Criança , Octreotida/uso terapêutico , Octreotida/efeitos adversos , Quilotórax/tratamento farmacológico , Quilotórax/etiologia , Estudos Retrospectivos , Cardiopatias Congênitas/cirurgia , Cardiopatias Congênitas/complicações , Resultado do Tratamento
2.
Int J Oral Maxillofac Surg ; 50(12): 1649-1652, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34059404

RESUMO

The long-term consequences of performing facial surgery on patients living in rural Ethiopia are largely unknown. A review of 36 patients who had been treated on a short-term surgical mission (STSM) in the previous 2 years was conducted to evaluate the outcomes of the surgical interventions performed. There was a significant reduction in social isolation following a surgical intervention. Improvements in postoperative self-reported changes were found for facial appearance, facial function, and quality of life. Positive outcomes can be achieved when surgical treatment is performed on a STSM.


Assuntos
Missões Médicas , Procedimentos de Cirurgia Plástica , Países em Desenvolvimento , Face , Humanos , Qualidade de Vida
5.
Ir Med J ; 112(3): 897, 2019 03 14.
Artigo em Inglês | MEDLINE | ID: mdl-31045336

RESUMO

A quality improvement project was carried out in a Level 3 Neonatal Intensive Care Unit (NICU) which aimed to successfully implement the use of continuous glucose monitoring systems (CGMS) in hypoglycaemic infants. Piloting of the device revealed several potential practical barriers to its reliably successful implementation. Five Plan-Do-Study-Act (PDSA) cycles followed, tackling these problems and other issues inductively identified throughout the project. Parents and multi-professional stakeholders were involved and consulted throughout. Change was measured on a runchart using qualitative and quantitative feedback. Problem rate per patient was reduced to zero by the end of a one-month study period. This study used basic quality improvement methodologies to implement a change intervention in a structured manner and elucidated aspects of its use that need to be adapted for its successful incorporation into real-life clinical practice.


Assuntos
Glicemia , Hipoglicemia/diagnóstico , Monitorização Fisiológica/métodos , Humanos , Hipoglicemia/sangue , Recém-Nascido , Unidades de Terapia Intensiva Neonatal , Projetos Piloto , Melhoria de Qualidade
7.
Br Dent J ; 224(10): 777-778, 2018 05 25.
Artigo em Inglês | MEDLINE | ID: mdl-29795487

RESUMO

Oral and maxillofacial surgeons carry out the diagnosis and treatment of diseases affecting the mouth, jaws, face and neck. They provide a critical referral service for dentists in general practice, with the most suspicious of these being sent as 'urgent suspected cancer', or 'USC'. According to national guidelines, such cases must be seen within 14 days. In January and February 2017, the oral and maxillofacial team in Morriston hospital received two such referrals from separate GDPs in the locality. Both were prioritised and seen within the two week window on consultant clinics. These two cases presented as enlarging, firm and painful neck swellings in otherwise relatively healthy adults, with no classical risk factors for malignancy, such as smoking, high alcohol intake or HPV virus. There was no dental pathology noted in either. Following clinical examination and special investigations within the OMFS department in Morriston Hospital, both patients were diagnosed, and treated under the vascular surgical team via surgical repair for carotid aneurysms. This is a condition rarely considered by dentists, and an uncommon differential diagnosis of a neck lump.


Assuntos
Aneurisma/diagnóstico por imagem , Artéria Carótida Externa/diagnóstico por imagem , Odontologia Geral , Encaminhamento e Consulta , Diagnóstico Diferencial , Feminino , Humanos , Imageamento Tridimensional , Pessoa de Meia-Idade , Tomografia Computadorizada por Raios X
9.
Diabet Med ; 35(3): 360-367, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29055156

RESUMO

AIMS: The comparative efficacy of Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy on Type 2 diabetes remission and the role of weight loss are unclear. The DiaRem diabetes remission prediction score uses HbA1c , age and diabetes medications but not diabetes duration. The aim of this study was to compare the DiaRem with the DiaBetter score that includes diabetes duration, upon combined (complete plus partial) 2-year post-surgery diabetes remission in people following RYGB and sleeve gastrectomy, and to investigate the relationship between weight loss and diabetes remission. METHODS: A retrospective single-centre cohort study of obese people with diabetes who underwent RYGB (107) or sleeve gastrectomy (103) and a validation cohort study (173) were undertaken. Diabetes remission, % weight loss, DiaRem, DiaBetter scores and areas under receiving operator characteristic (ROC) curves were calculated. The relationship between % weight loss and diabetes remission was investigated using logistic regression. RESULTS: The proportion of people achieving diabetes remission was highest for those with the lowest DiaBetter and DiaRem scores. Areas under the ROC curves were comparable [DiaBetter: 0.867 (95%CI: 0.817-0.916); DiaRem: 0.865 (95%CI: 0.814-0.915), P=0.856]. Two-year % weight loss was higher post RYGB [26.6 (95%CI: 24.8-28.4)] vs post-sleeve gastrectomy [20.6 (95%CI: 18.3-22.8), P<0.001]. RYGB had 151% higher odds of diabetes remission [OR 2.51 (95%CI: 1.12-5.60), P=0.025]. This association became non-significant when adjusted for % weight loss. CONCLUSION: DiaBetter and DiaRem scores predict diabetes remission following both procedures. Two-year % weight loss plays a key role in determining diabetes remission.


Assuntos
Cirurgia Bariátrica/métodos , Diabetes Mellitus Tipo 2/cirurgia , Gastrectomia/métodos , Redução de Peso/fisiologia , Diabetes Mellitus Tipo 2/sangue , Feminino , Derivação Gástrica/métodos , Hemoglobinas Glicadas/metabolismo , Humanos , Masculino , Pessoa de Meia-Idade , Probabilidade , Indução de Remissão , Resultado do Tratamento
10.
Ir Med J ; 110(3): 529, 2017 Mar 10.
Artigo em Inglês | MEDLINE | ID: mdl-28657242

RESUMO

Near-Peer Teaching is a relatively new and expanding area of medical education. The benefit to medical students has been demonstrated in numerous contexts around the world. Our aim was to establish a structured Intern-Led Teaching (ILT) programme in the context of an Irish Intern Training Network affiliated to an Irish Medical School. We then sought to evaluate the success of this programme. Seventy interns were enrolled in the ILT programme and completed a Train the Trainer course involving teaching methods and skills of effective feedback. Following this, the intern tutors delivered several one-hour teaching sessions in small groups to final year medical students on a weekly basis. At the end of each teaching block, a feedback questionnaire was distributed to participating students to evaluate their experiences of this new teaching modality. Tutorial topics were varied. They included clinical examination, history taking, prescribing, and emergencies. Eighty-one percent of students found the intern-led tutorials to be beneficial compared to tutorials run by more senior doctors. Additionally, students felt that with intern led tutorials they could ask questions they otherwise would not. There was a more comfortable environment, and information taught was considered more relevant. A significant number of students felt less nervous about the final medical examinations after the intern-led tutorials. The establishment of a structured intern-led teaching programme was well received by final year medical students. This project shows that interns are a valuable teaching resource in the medical school and should be included in medical schools' curricula.


Assuntos
Currículo , Educação Médica/métodos , Internato e Residência , Grupo Associado , Desenvolvimento de Programas , Estudantes de Medicina , Ensino/organização & administração , Atitude do Pessoal de Saúde , Competência Clínica , Educação Médica/organização & administração , Educação de Graduação em Medicina , Humanos , Irlanda , Tutoria/métodos , Tutoria/organização & administração , Avaliação de Programas e Projetos de Saúde
11.
Am J Transplant ; 12(12): 3289-95, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22947033

RESUMO

There have been few studies of patients with renal allografts functioning for more than 20 years. We sought to identify clinical factors associated with ultra long-term (>20 year) renal allograft survival and to describe the clinical features of these patients. We performed a retrospective analysis of the Irish Renal Transplant Database and included 1174 transplants in 1002 patients. There were 255 (21.74%) patients with graft function for 20 years or more. Multivariate analysis identified recipient age (HR 1.01, CI 1.01-1.02), gender (male HR 1.25, CI 1.08-1.45), acute rejection (HR 1.26, CI 1.09-1.45) and transplant type (living related donor vs. deceased donor) (HR 0.52, CI 0.40-0.66) as significantly associated with long-term graft loss. Median serum creatinine was 115 µmol/L. The 5-year graft survival in 20-year survivors was 74.7%. The mean age at death was 62.7 years (±10.6). The most common causes of death were cardiovascular disease and malignancy. The two major causes of graft loss were death (with function) and interstitial fibrosis/tubular atrophy. Comorbidities included skin cancer (36.1%), coronary heart disease (17.3%) and other malignancies (14.5%). This study identifies factors associated with long-term allograft survival and a high rate of morbidity and early mortality in long-term transplant recipients.


Assuntos
Rejeição de Enxerto/mortalidade , Sobrevivência de Enxerto , Transplante de Rim/mortalidade , Sobreviventes/estatística & dados numéricos , Adulto , Comorbidade , Feminino , Humanos , Doadores Vivos , Masculino , Estudos Retrospectivos , Fatores de Risco , Taxa de Sobrevida , Fatores de Tempo
12.
Nucleic Acids Res ; 37(Database issue): D690-7, 2009 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19033362

RESUMO

The Ensembl project (http://www.ensembl.org) is a comprehensive genome information system featuring an integrated set of genome annotation, databases, and other information for chordate, selected model organism and disease vector genomes. As of release 51 (November 2008), Ensembl fully supports 45 species, and three additional species have preliminary support. New species in the past year include orangutan and six additional low coverage mammalian genomes. Major additions and improvements to Ensembl since our previous report include a major redesign of our website; generation of multiple genome alignments and ancestral sequences using the new Enredo-Pecan-Ortheus pipeline and development of our software infrastructure, particularly to support the Ensembl Genomes project (http://www.ensemblgenomes.org/).


Assuntos
Bases de Dados Genéticas , Genômica , Animais , Variação Genética , Humanos , Internet , Alinhamento de Sequência
13.
Colorectal Dis ; 11(6): 642-7, 2009 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18637938

RESUMO

BACKGROUND: Surgeons are increasingly considering resection and primary anastomosis when treating left-sided colonic obstruction or perforation in preference to the more traditional staged procedures. Previous studies in the United Kingdom (UK) and United States of America (USA) have suggested a greater interest in single-staged procedures amongst UK surgeons. This study was aimed to directly compare the treatment preferences between UK and US surgeons. METHOD: A questionnaire, designed to determine the procedure of choice when faced with left-sided colonic emergencies in patients with good and poor anaesthetic risk, was sent to 500 surgeons in the UK and 500 surgeons in the USA. RESULTS: UK surgeons were more likely to perform resection, primary anastomosis and on-table colonic lavage in patients with sigmoid obstruction (good anaesthetic risk: P < 0.0001; poor risk: P < 0.01) and sigmoid perforation (good risk: P < 0.0001). In good-risk patients with sigmoid obstruction, US surgeons were more likely than UK to choose Hartmann's procedure (P < 0.0001). US surgeons performing primary anastomosis were less likely to perform on-table lavage. CONCLUSION: Single-stage procedures are widely accepted as viable treatment options in both the UK and the USA when dealing with left-sided colonic emergencies. British surgeons are more likely to favour single-staged procedures, particularly with on-table colonic lavage, when compared with US surgeons.


Assuntos
Anastomose Cirúrgica/estatística & dados numéricos , Colectomia/métodos , Colo Descendente/cirurgia , Colo Sigmoide/cirurgia , Obstrução Intestinal/cirurgia , Perfuração Intestinal/cirurgia , Adulto , Idoso , Anastomose Cirúrgica/métodos , Colostomia/estatística & dados numéricos , Coleta de Dados , Humanos , Pessoa de Meia-Idade , Reino Unido , Estados Unidos
14.
Appl Radiat Isot ; 66(11): 1711-7, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18513984

RESUMO

A new Certified Reference Material (CRM) for radionuclides in sediment (IAEA-385) is described and the results of the certification process are presented. Eleven radionuclides ((40)K, (137)Cs, (226)Ra, (228)Ra, (230)Th, (232)Th, (234)U, (238)U, (238)Pu, (239+240)Pu and (241)Am) have been certified and information mass activities with 95% confidence intervals are given for seven other radionuclides ((90)Sr, (210)Pb((210)Po), (235)U, (239)Pu, (240)Pu and (241)Pu). Results for less frequently reported radionuclides ((60)Co, (99)Tc, (134)Cs, (155)Eu, (224)Ra and (239)Np) and information on some activity and mass ratios are also reported. The CRM can be used for quality assurance/quality control of the analysis of radionuclides in sediment samples, for the development and validation of analytical methods and for training purposes.


Assuntos
Sedimentos Geológicos/análise , Guias de Prática Clínica como Assunto , Monitoramento de Radiação/normas , Radioisótopos/análise , Radioisótopos/normas , Irlanda , Oceanos e Mares , Doses de Radiação , Valores de Referência
15.
Nucleic Acids Res ; 36(Database issue): D707-14, 2008 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18000006

RESUMO

The Ensembl project (http://www.ensembl.org) is a comprehensive genome information system featuring an integrated set of genome annotation, databases and other information for chordate and selected model organism and disease vector genomes. As of release 47 (October 2007), Ensembl fully supports 35 species, with preliminary support for six additional species. New species in the past year include platypus and horse. Major additions and improvements to Ensembl since our previous report include extensive support for functional genomics data in the form of a specialized functional genomics database, genome-wide maps of protein-DNA interactions and the Ensembl regulatory build; support for customization of the Ensembl web interface through the addition of user accounts and user groups; and increased support for genome resequencing. We have also introduced new comparative genomics-based data mining options and report on the continued development of our software infrastructure.


Assuntos
Bases de Dados Genéticas , Genômica , Animais , Gráficos por Computador , Humanos , Internet , Camundongos , Elementos Reguladores de Transcrição , Software , Interface Usuário-Computador
16.
Bioinformatics ; 23(13): 1689-91, 2007 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-17485433

RESUMO

UNLABELLED: The undertaking of large-scale DNA sequencing screens for somatic variants in human cancers requires accurate and rapid processing of traces for variants. Due to their often aneuploid nature and admixed normal tissue, heterozygous variants found in primary cancers are often subtle and difficult to detect. To address these issues, we have developed a mutation detection algorithm, AutoCSA, specifically optimized for the high throughput screening of cancer samples. AVAILABILITY: http://www.sanger.ac.uk/genetics/CGP/Software/AutoCSA.


Assuntos
Algoritmos , Mapeamento Cromossômico/métodos , Análise Mutacional de DNA/métodos , DNA de Neoplasias/genética , Testes Genéticos/métodos , Neoplasias/diagnóstico , Neoplasias/genética , Sequência de Bases , Predisposição Genética para Doença/genética , Variação Genética/genética , Humanos , Dados de Sequência Molecular , Software
17.
Gait Posture ; 25(3): 425-31, 2007 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-16806934

RESUMO

Clinical and dynamic (gait-related) measures thought to be associated with pelvic retraction were investigated in patients with cerebral palsy. Gait laboratory data of 233 patients with cerebral palsy were studied retrospectively. Two groups were selected; those who demonstrated pelvic retraction during gait <-6.85 degrees (mean - 2 standard deviations from normal (n=88) and those with >-4.83 degrees (mean - 1 standard deviation from normal) (n=101). About 37.8% of the total population reviewed showed pelvic retraction of <-6.85 degrees . There was a higher prevalence of retraction among hemiplegics (46.3%) compared to diplegics (30.4%). Differences were also found between hemiplegic and diplegic subjects in terms of factors associated with pelvic retraction. Clinical and dynamic tightness of the gastro-soleus were the most significant features associated with pelvic retraction among hemiplegic subjects. Clinical and dynamic flexion and internal rotation of the hip were the most significant features associated with retraction in the diplegic population. This study suggests that pelvic retraction is multifactorial in origin and secondary to both static clinical measures as well as dynamic features during gait.


Assuntos
Paralisia Cerebral/fisiopatologia , Transtornos Neurológicos da Marcha/fisiopatologia , Pelve/fisiopatologia , Adolescente , Adulto , Fenômenos Biomecânicos , Criança , Pré-Escolar , Feminino , Hemiplegia/fisiopatologia , Articulação do Quadril/fisiopatologia , Humanos , Extremidade Inferior/fisiopatologia , Masculino , Contração Muscular/fisiologia , Músculo Esquelético/fisiopatologia , Estudos Retrospectivos , Rotação
18.
Surg Endosc ; 21(2): 299-302, 2007 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-17122985

RESUMO

BACKGROUND: Patients with esophagogastric malignancies often require nutritional supplementation in the perioperative period, especially in the setting where neoadjuvant therapy may delay tumor resection. A simple technique is described here that can be performed at the time of staging laparoscopy and that has not been described before. RESULTS: Forty-three patients treated over a 4-year period who had a laparoscopic feeding jejunostomy placed at the time of staging laparoscopy were reviewed. Of these, 35 had preoperative chemotherapy according to a modified MRC OEO2 protocol. In the period between staging and eventual resection, 32% required immediate feeding, and in 14% of those who were thought not to need feeding it later became necessary. More patients gained weight or had a rise in albumin in the group that had jejunal feeding (p < 0.05). The mean time to surgery was 10 weeks. There were no conversions to an open procedure, nor were there any laparotomies for tube-related complications. Dislodgement was recorded in 6 patients; blockage, in 4. In most of these cases a simple bedside replacement of the tube was all that was required. Mean time in the operating room for each procedure was 44 minutes. CONCLUSIONS: Laparoscopic percutaneous feeding jejunostomy is a safe and simple technique that adds little to the morbidity and cost of managing patients with esophagogastric cancers. It facilitates optimization of nutrition in the perioperative period for these patients, especially in those receiving preoperative chemotherapy.


Assuntos
Nutrição Enteral/métodos , Jejunostomia/métodos , Laparoscopia/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Distribuição de Qui-Quadrado , Neoplasias Esofágicas/patologia , Neoplasias Esofágicas/cirurgia , Esofagectomia/métodos , Feminino , Seguimentos , Gastrectomia/métodos , Humanos , Jejunostomia/efeitos adversos , Laparoscopia/efeitos adversos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Estado Nutricional , Probabilidade , Estudos Retrospectivos , Medição de Risco , Neoplasias Gástricas/patologia , Neoplasias Gástricas/cirurgia , Resultado do Tratamento , Aumento de Peso
19.
Eur J Nutr ; 45(2): 113-22, 2006 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-16032375

RESUMO

BACKGROUND: Consumption of fruit and vegetables is associated with a decreased risk of heart disease and cancer. This has been ascribed in part to antioxidants in these foods inactivating reactive oxygen species involved in initiation or progression of these diseases. Non-nutritive anthocyanins are present in significant amounts in the human diet. However, it is unclear whether they have health benefits in humans. AIM: To determine whether daily consumption of anthocyanin-rich cranberry juice could alter plasma antioxidant activity and biomarkers of oxidative stress. METHODS: 20 healthy female volunteers aged 18-40 y were recruited. Subjects consumed 750 ml/day of either cranberry juice or a placebo drink for 2 weeks. Fasted blood and urine samples were obtained over 4 weeks. The total phenol, anthocyanin and catechin content of the supplements and plasma were measured. Anthocyanin glycosides were identified by tandem mass spectrometry (MS-MS). Vitamin C, homocysteine (tHcy) and reduced glutathione (GSH) were measured by HPLC. Total antioxidant ability was determined using electron spin resonance (ESR) spectrometry and by the FRAP assay. Plasma total cholesterol, high density lipoprotein (HDL), and low density lipoprotein (LDL) cholesterol and triglycerides (TG) were measured. Glutathione peroxidase (GSH-Px), catalase (CAT) and superoxide dismutase (SOD) activities were measured in erythrocytes. Urine was collected for analysis of malondialdehyde (MDA) by HPLC and 8-oxo-deoxyguanosine (8-oxo-dG) by ELISA. Endogenous and induced DNA damage were measured by single cell gel electrophoresis (SCGE) in lymphocytes. RESULTS: Vitamin C, total phenol, anthocyanin and catechin concentrations and FRAP and ESR values were significantly higher in the cranberry juice compared with the placebo. Cyanidin and peonidin glycosides comprised the major anthocyanin metabolites [peonidin galactoside (29.2%) > cyanidin arabinoside (26.1%) > cyanidin galactoside (21.7%) > peonidin arabinoside (17.5%) > peonidin glucoside (4.1%) > cyanidin glucoside (1.4 %)]. Plasma vitamin C increased significantly (P<0.01) in volunteers consuming cranberry juice. No anthocyanins (plasma) or catechins (plasma or urine) were detectable and plasma total phenols, tHcy,TC,TG,HDL and LDL were unchanged. The antioxidant potential of the plasma, GSH-Px, CAT and SOD activities, and MDA were similar for both groups. Supplementation with cranberry juice did not affect 8-oxo-deoxyguanosine in urine or endogenous or H(2)O(2)-induced DNA damage in lymphocytes. CONCLUSIONS: Cranberry juice consumption did not alter blood or cellular antioxidant status or several biomarkers of lipid status pertinent to heart disease. Similarly, cranberry juice had no effect on basal or induced oxidative DNA damage. These results show the importance of distinguishing between the in vitro and in vivo antioxidant activities of dietary anthocyanins in relation to human health.


Assuntos
Antocianinas/metabolismo , Antioxidantes/metabolismo , Bebidas , Estresse Oxidativo/efeitos dos fármacos , Vaccinium macrocarpon/química , Adolescente , Adulto , Antocianinas/administração & dosagem , Antocianinas/sangue , Antocianinas/urina , Antioxidantes/administração & dosagem , Biomarcadores/sangue , Biomarcadores/urina , Cromatografia Líquida de Alta Pressão/métodos , Dano ao DNA/efeitos dos fármacos , Feminino , Cardiopatias/epidemiologia , Cardiopatias/etiologia , Humanos , Neoplasias/epidemiologia , Neoplasias/etiologia
20.
Exp Neurol ; 197(1): 8-21, 2006 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16095594

RESUMO

Abnormally high levels of homocysteine (HCY) have been linked to neurodegenerative diseases, but it remains unclear whether this is the cause or effect of degenerative processes. Here, we investigated the effects of prolonged HCY exposure on cognitive abilities and physiological parameters by injecting rats daily with either 20 or 200 mg/kg HCY over a period of up to 14 weeks. Notwithstanding a significant weight reduction in the 200 mg HCY group, HCY-exposed animals did not show a behavioural deficit when tested repeatedly (in weeks 1, 3, 5, 7 and 13) in a reference memory version of the water maze. Unexpectedly, some improvement in repeated reversal learning was observed in HCY exposed animals compared to controls. Pre-treatment with HCY for 3 weeks before water maze training did not uncover any cognitive alterations. Increased plasma concentrations of HCY were revealed only for the 200 mg HCY group after 14 weeks of injections, but no evidence for DNA damage was obtained. Immunocytochemically, HCY was detected in the brain after 14 weeks of treatment (both 20 and 200 mg/kg), but not after 5 weeks. Bidirectional changes in basic synaptic transmission and long-term potentiation of hippocampal CA1 pyramidal cells were observed at 5, 7 and 14 weeks in both HCY groups, indicative of complex, multifactorial time- and concentration-dependent changes. Overall, it is concluded that healthy adult rats are able to cope with continuous exposure to HCY. While HCY affects growth and neuronal excitability, this does not precipitate into an immediate impairment of cognitive function.


Assuntos
Hipocampo/efeitos dos fármacos , Homocisteína/toxicidade , Aprendizagem em Labirinto/efeitos dos fármacos , Memória/efeitos dos fármacos , Plasticidade Neuronal/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Sinapses/efeitos dos fármacos , Animais , Separação Celular , Ensaio Cometa , Eletrofisiologia , Homocisteína/sangue , Imuno-Histoquímica , Técnicas In Vitro , Linfócitos/efeitos dos fármacos , Masculino , Proteínas do Tecido Nervoso/metabolismo , Ratos , Reversão de Aprendizagem/efeitos dos fármacos , Percepção Espacial/efeitos dos fármacos , Aumento de Peso/efeitos dos fármacos
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