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1.
Acta Oncol ; 58(sup1): S60-S64, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30789086

RESUMO

BACKGROUND: Local excision is now accepted as a standard treatment option for certain patients with early rectal cancer. However, there is a higher risk of local recurrence than after radical surgery with total mesorectal excision. Adjuvant radiotherapy after local excision may reduce this excess risk, and yet retain the benefits of local excision, with rectal preservation. METHODS: A review of the literature pertaining to the use of adjuvant radiotherapy after local excision of rectal cancer and a discussion of current practice. RESULTS: We first considered local excision as a treatment option for early rectal cancer, looking at technical developments and the risks and benefits of organ preservation, in particular, the advantages for quality of life and the risk of leaving residual disease which may result in local recurrence. We then looked at reported outcomes for studies using adjuvant radiotherapy after local excision. Few of the studies routinely used modern endoscopic methods of local excision and only the recent used chemoradiation. Local recurrence rates after adjuvant radiotherapy have improved over time, with rates of around 3.5% in the recent studies. Adverse effects of adjuvant radiotherapy are not commonly described, but generally, they are relatively mild when described. We then discussed current practice regarding adjuvant radiotherapy, including pathological criteria, discussion of local recurrence risk with the patient and the importance of a surveillance regime to detect any recurrence at an early stage. CONCLUSION: We conclude that the current state of knowledge regarding adjuvant radiotherapy after local excision suggests a potential role in decreasing the risk of local recurrence but further studies are required to better define this effect, clarify which patients will gain the most benefit from this pathway, and identify those who should avoid exposure to the risks of radiotherapy.


Assuntos
Procedimentos Cirúrgicos do Sistema Digestório/métodos , Qualidade de Vida , Radioterapia Adjuvante , Neoplasias Retais/radioterapia , Humanos , Prognóstico , Neoplasias Retais/cirurgia
2.
Colorectal Dis ; 21(4): 451-459, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30585677

RESUMO

AIM: Early rectal cancer can be managed effectively with local excision, which is now the standard of care for many T1 lesions. However, the presence of unexpected adverse histopathological factors may indicate an increased risk of local recurrence, prompting consideration of completion radical surgery. Many patients are unfit or prefer to avoid radical surgery, relying instead on surveillance and early detection of recurrent disease. Recently, radiotherapy has shown promise as an adjuvant therapy in this group. This study assesses local recurrence rates after local excision with adjuvant radiotherapy at a single centre. METHOD: This was a retrospective review of a prospective database of all patients undergoing transanal endoscopic microsurgery (TEM) in a single institution. Data covering a 10-year period were analysed. RESULTS: Of 197 patients undergoing TEM for rectal cancer, 33 (17%) had adjuvant radiotherapy because of adverse histopathological features. At 3.2 years' median follow-up, there were three instances of local recurrence (9.1%). Estimated local recurrence at 1 and 3 years was 0% and 6.9%, compared to 16.8% and 21.2% in a propensity-score-matched group who were followed by surveillance alone. Local recurrence was diagnosed at a median of 23 months post-TEM in the radiotherapy group, compared to 8 months in the matched group. CONCLUSION: Radiotherapy after TEM is associated with a trend towards a reduced rate of local recurrence, even for high-risk disease. Radiotherapy would appear to offer a viable alternative to radical completion surgery in the presence of unforeseen adverse histopathological features, as long as a meticulous surveillance programme is in place.


Assuntos
Recidiva Local de Neoplasia/prevenção & controle , Protectomia/estatística & dados numéricos , Radioterapia Adjuvante/estatística & dados numéricos , Neoplasias Retais/terapia , Microcirurgia Endoscópica Transanal/estatística & dados numéricos , Adulto , Idoso , Bases de Dados Factuais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Recidiva Local de Neoplasia/epidemiologia , Protectomia/métodos , Estudos Prospectivos , Radioterapia Adjuvante/métodos , Estudos Retrospectivos , Microcirurgia Endoscópica Transanal/métodos , Resultado do Tratamento
3.
Colorectal Dis ; 20(7): 586-592, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-29363859

RESUMO

AIM: Minimally invasive, organ-sparing surgery has been used increasingly for early rectal cancer in recent years. However, local recurrence remains a concern. This study presents a 10-year single-centre experience of recurrence after local excision for T1 rectal cancer. METHOD: Data were collected prospectively on all patients undergoing local excision by transanal endoscopic microsurgery (TEM) in a single institution. Data covering a 10-year period were analysed. RESULTS: In all, 192 patients underwent TEM for rectal cancer; 70 of these had T1 tumour in the TEM specimen and did not have preoperative radiotherapy. Four were managed with completion surgery following TEM and a further six had radiotherapy; 60 underwent surveillance alone. Local recurrence occurred in six patients; three underwent salvage surgery. Estimated local recurrence at 3 years was 7.2% for the surveillance alone group. CONCLUSIONS: Local recurrence rates were lower than previous studies. Better preoperative assessment, more effective local excision surgery and postoperative radiotherapy may be contributory factors to a better-than-predicted outcome. Local excision should be offered as part of standard of care for T1 rectal cancer in the presence of good preoperative selection and meticulous surveillance.


Assuntos
Seleção de Pacientes , Neoplasias Retais/cirurgia , Vigilância de Evento Sentinela , Microcirurgia Endoscópica Transanal/estatística & dados numéricos , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Recidiva Local de Neoplasia/epidemiologia , Recidiva Local de Neoplasia/patologia , Estadiamento de Neoplasias , Período Pós-Operatório , Estudos Prospectivos , Neoplasias Retais/patologia , Estudos Retrospectivos , Resultado do Tratamento
4.
Psychol Med ; 47(5): 971-980, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-27928975

RESUMO

BACKGROUND: Observational associations between cannabis and schizophrenia are well documented, but ascertaining causation is more challenging. We used Mendelian randomization (MR), utilizing publicly available data as a method for ascertaining causation from observational data. METHOD: We performed bi-directional two-sample MR using summary-level genome-wide data from the International Cannabis Consortium (ICC) and the Psychiatric Genomics Consortium (PGC2). Single nucleotide polymorphisms (SNPs) associated with cannabis initiation (p < 10-5) and schizophrenia (p < 5 × 10-8) were combined using an inverse-variance-weighted fixed-effects approach. We also used height and education genome-wide association study data, representing negative and positive control analyses. RESULTS: There was some evidence consistent with a causal effect of cannabis initiation on risk of schizophrenia [odds ratio (OR) 1.04 per doubling odds of cannabis initiation, 95% confidence interval (CI) 1.01-1.07, p = 0.019]. There was strong evidence consistent with a causal effect of schizophrenia risk on likelihood of cannabis initiation (OR 1.10 per doubling of the odds of schizophrenia, 95% CI 1.05-1.14, p = 2.64 × 10-5). Findings were as predicted for the negative control (height: OR 1.00, 95% CI 0.99-1.01, p = 0.90) but weaker than predicted for the positive control (years in education: OR 0.99, 95% CI 0.97-1.00, p = 0.066) analyses. CONCLUSIONS: Our results provide some that cannabis initiation increases the risk of schizophrenia, although the size of the causal estimate is small. We find stronger evidence that schizophrenia risk predicts cannabis initiation, possibly as genetic instruments for schizophrenia are stronger than for cannabis initiation.


Assuntos
Estudo de Associação Genômica Ampla/métodos , Uso da Maconha/epidemiologia , Análise da Randomização Mendeliana/métodos , Esquizofrenia/epidemiologia , Humanos , Polimorfismo de Nucleotídeo Único , Risco
5.
Colorectal Dis ; 17(6): 515-21, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25524660

RESUMO

AIM: Traditionally, pelvic floor retraining for faecal incontinence or obstructed defaecation has been delivered to patients through individual sessions with a specialist pelvic floor nurse, a resource-intensive practice. This study aimed to assess whether a similar outcome can be achieved by delivering retraining to patients in small groups, allowing considerable savings in the use of resources. METHOD: Data were collected prospectively in a pelvic floor database. Patients received pelvic floor retraining either individually or in a small group setting and completed baseline and follow-up questionnaires. Two hundred and fifteen patients were treated, 119 individually and 96 in a small group setting. Scores before and after treatment for the two settings were compared for the Gastrointestinal Quality of Life Index, the Fecal Incontinence Severity Index and the Patient Assessment of Constipation Symptoms. Additionally patients receiving group treatment completed a short questionnaire on their experience. RESULTS: The median change in Gastrointestinal Quality of Life Index score was 5 (range -62 to 73) for individual treatment and 4 (range -41 to 47) for group treatment, both showing statistically significant improvement. However, there was no significant difference between the settings. Similar results were obtained with the Fecal Incontinence Severity Index and Patient Assessment of Constipation Symptoms scores for the faecal incontinence and obstructed defaecation subgroups respectively. CONCLUSION: The majority of patients experienced symptomatic improvement following pelvic floor retraining and there was no significant difference in the resulting improvement according to treatment setting. As treatment costs are considerably less in a group setting, group pelvic floor retraining is more cost-effective than individual treatment.


Assuntos
Terapia por Exercício/métodos , Incontinência Fecal/terapia , Distúrbios do Assoalho Pélvico/terapia , Adulto , Idoso , Constipação Intestinal/psicologia , Constipação Intestinal/terapia , Defecação , Terapia por Exercício/economia , Terapia por Exercício/psicologia , Incontinência Fecal/psicologia , Feminino , Alocação de Recursos para a Atenção à Saúde/métodos , Humanos , Masculino , Pessoa de Meia-Idade , Diafragma da Pelve , Distúrbios do Assoalho Pélvico/psicologia , Estudos Prospectivos , Qualidade de Vida , Índice de Gravidade de Doença , Inquéritos e Questionários , Resultado do Tratamento
6.
Transl Psychiatry ; 14(1): 222, 2024 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-38811538

RESUMO

Omega-3 fatty acids have been implicated in the aetiology of depressive disorders, though trials supplementing omega-3 to prevent major depressive disorder (MDD) have so far been unsuccessful. Whether this association is causal remains unclear. We used two sample Mendelian randomization (MR) to investigate causality. Genetic variants associated with circulating omega-3 and omega-6 fatty acids in UK Biobank (UKBB, n = 115,078) were selected as exposures. The Psychiatric Genomics Consortium (PGC) genome-wide association studies (GWAS) of MDD (n = 430,775; cases = 116,209; controls = 314,566) and recurrent depression (rMDD, n = 80,933; cases = 17,451; controls = 62,482), were used as outcomes. Multivariable MR (MVMR) models were used to account for biologically correlated lipids, such as high- and low-density cholesterol and triglycerides, and to explore the relative importance of longer-chain omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) using data from the Cohorts for Heart and Aging Research in Genomic Epidemiology (CHARGE, n = 8866). Genetic colocalization analyses were used to explore the presence of a shared underlying causal variant between traits. Genetically predicted total omega-3 fatty acids reduced the odds of MDD (ORIVW 0.96 per standard deviation (SD, i.e. 0.22 mmol/l) (95% CIs 0.93-0.98, p = 0.003)). The largest point estimates were observed for eicosapentaenoic acid (EPA), a long-chain omega-3 fatty acid (OREPA 0.92; 95% CI 0.88-0.96; p = 0.0002). The effect of omega-3 fatty acids was robust to MVMR models accounting for biologically correlated lipids. 'Leave-one-out' analyses highlighted the FADS gene cluster as a key driver of the effect. Colocalization analyses suggested a shared causal variant using the primary outcome sample, but genomic confounding could not be fully excluded. This study supports a role for omega-3 fatty acids, particularly EPA, in the aetiology of depression, although pleiotropic mechanisms cannot be ruled out. The findings support guidelines highlighting the importance of EPA dose and ratio for MDD and question whether targeted interventions may be superior to universal prevention trials, as modest effect sizes will limit statistical power.


Assuntos
Transtorno Depressivo Maior , Ácidos Graxos Ômega-3 , Estudo de Associação Genômica Ampla , Análise da Randomização Mendeliana , Humanos , Transtorno Depressivo Maior/genética , Transtorno Depressivo Maior/epidemiologia , Ácidos Graxos Ômega-3/sangue , Feminino , Masculino , Polimorfismo de Nucleotídeo Único , Pessoa de Meia-Idade , Ácido Eicosapentaenoico/sangue , Ácidos Docosa-Hexaenoicos/sangue , Dessaturase de Ácido Graxo Delta-5 , Ácidos Graxos Dessaturases/genética , Adulto , Ácidos Graxos Ômega-6/sangue , Idoso , Reino Unido/epidemiologia
7.
Psychoneuroendocrinology ; 139: 105707, 2022 05.
Artigo em Inglês | MEDLINE | ID: mdl-35286909

RESUMO

BACKGROUND: Metabolic and inflammatory disorders commonly co-occur with depression and psychosis, with emerging evidence implicating immuno-metabolic dysfunction in their aetiology. Previous studies have reported metabolic dysfunction and inflammation in adults with depression and psychosis. However, longitudinal studies testing the direction of association, and the effects of different dimensions of early-life immuno-metabolic dysfunction on adult psychopathology are limited. METHODS: Using data from 3258 birth cohort participants we examined longitudinal associations of three metabolic hormones (leptin, adiponectin, insulin) at age 9 with risks for depression- and psychosis-spectrum outcomes at age 24. In addition, using nine immuno-metabolic biomarkers (leptin, adiponectin, insulin, interleukin-6, C-Reactive protein, low density lipoprotein, high density lipoprotein, triglycerides, and BMI), we constructed an exploratory bifactor model showing a general immuno-metabolic factor and three specific factors (adiposity, inflammation, and insulin resistance), which were also used as exposures. RESULTS: Childhood leptin was associated with adult depressive episode (adjusted odds ratio (aOR)= 1.31; 95% CI, 1.02-1.71) and negative symptoms (aOR=1.15; 95% CI, 1.07-1.24), but not positive psychotic symptoms. The general immuno-metabolic factor was associated with atypical depressive symptoms (aOR=1.07; 95% CI, 1.01-1.14) and psychotic experiences (aOR=1.21; 95% CI, 1.02-1.44). The adiposity factor was associated with negative symptoms (aOR=1.07; 95% CI 1.02-1.12). Point estimates tended to be larger in women, though 95% credible intervals overlapped with those for men. In women, the inflammatory factor was associated with depressive episodes (aOR=1.27; 95% CI, 1.03-1.57). CONCLUSIONS: While general immuno-metabolic dysfunction in childhood may contribute to risks for both psychotic and depressive symptoms in adulthood, childhood adiposity and inflammation appear to be particularly linked to affective (depressive and negative), but not positive psychotic symptoms.


Assuntos
Depressão , Transtornos Psicóticos , Adulto , Coorte de Nascimento , Criança , Estudos de Coortes , Feminino , Humanos , Masculino , Estudos Prospectivos , Adulto Jovem
8.
Schizophr Res ; 224: 108-115, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-33067055

RESUMO

BACKGROUND: Long chain polyunsaturated fatty acid (PUFA) levels have been implicated in the pathology of psychotic disorders. We investigated the relationship between childhood PUFA levels and later psychotic experiences (PE's) in a large birth cohort. METHODS: Plasma levels of Ω-3 and Ω-6 fatty acids (FA's) were assayed at ages 7 and 16 years. PE's were assessed at ages 12 and 18 years using a semi-structured interview. Primary outcome was any PE's at 18 years; sensitivity analyses examined incident PE's between ages 12 and 18 years, persistent PE's (at 12 and 18) and psychotic disorder at 18 years. Genetic instruments for Ω-3 and Ω-6 were derived and used in a multivariable Mendelian Randomization analysis. RESULTS: Higher levels of Ω-6 FA's AA, OA and AdA at age 7 years were weakly associated with a reduced risk for PE's at 18 years, however, effect sizes were small and attenuated after adjusting for confounders (strongest evidence for OA; adjusted OR, 0.842; 95% CI, 0.711, 0.998; p, 0.048). Total Ω-6 levels at age 16 years were associated with an increased odds of psychotic disorder at age 18 years. However, there was no association between Ω-6/Ω-3 ratio and psychosis outcomes, nor with genetic instruments of total Ω-3 or Ω-6 levels. CONCLUSIONS: There is no strong evidence that total plasma Ω-3 FA levels or Ω-6/Ω-3 ratios in childhood and mid-adolescence are associated with increased risk for PE's or psychotic disorder, but very marginal evidence that alterations in the Ω-6 pathway at developmental time points might influence risk2.


Assuntos
Ácidos Graxos Ômega-3 , Transtornos Psicóticos , Adolescente , Criança , Ácidos Graxos , Ácidos Graxos Ômega-6 , Ácidos Graxos Insaturados , Humanos , Transtornos Psicóticos/epidemiologia
9.
Vet Rec ; 160(14): 465-70, 2007 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-17416722

RESUMO

Only two of 49 cats undergoing surgical ligation of congenital extra- and intrahepatic portosystemic shunts died perioperatively, a mortality rate comparable with the mortality rates of dogs undergoing surgical attenuation of congenital portosystemic shunts and cats in which the shunts are attenuated with an ameroid ring constrictor. Thirty (83 per cent) of the 36 cats for which long-term information was available were still alive at a median follow-up period of 47 months (range six to 105 months); the outcome was excellent (no clinical signs) in 20 of them (median follow-up 37 months, range six to 105 months) and good (minimal clinical signs) in seven (median follow-up 39 months, range 10 to 73 months) and none of these 27 cats was on any long-term medication or special diet. The only major cause of morbidity was the development of neurological signs in 18 (37 per cent) of the cats. These included seizures and a wide variety of other neurological signs, and their development and persistence was not affected by the presence of preoperative seizures, the type of shunt, the degree of shunt attenuation or the age of the cat. The serum concentrations of ammonia and preprandial bile acids were normal or significantly below normal in the cats with neurological signs. Liver histopathology was similar in the cats with and without neurological signs. Ten (56 per cent) of the 18 cats that developed neurological signs recovered normal neurological function long term.


Assuntos
Doenças do Gato/epidemiologia , Sistema Porta/anormalidades , Sistema Porta/cirurgia , Complicações Pós-Operatórias/veterinária , Convulsões/veterinária , Animais , Doenças do Gato/mortalidade , Gatos , Feminino , Seguimentos , Ligadura/métodos , Ligadura/veterinária , Masculino , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/mortalidade , Convulsões/epidemiologia , Convulsões/mortalidade , Análise de Sobrevida , Fatores de Tempo , Resultado do Tratamento
10.
Circulation ; 102(8): 871-5, 2000 Aug 22.
Artigo em Inglês | MEDLINE | ID: mdl-10952955

RESUMO

BACKGROUND: Considerable evidence suggests that hyperhomocysteinemia is an independent vascular risk factor that promotes atherosclerosis by inducing endothelial dysfunction. Although folic acid reduces hyperhomocysteinemia, the effect on adverse vascular events is unknown. We hypothesized that in patients with chronic renal failure, a condition associated with both hyperhomocysteinemia and atherosclerosis, treatment with folic acid would improve endothelial function. METHODS AND RESULTS: In a prospective, double-blind protocol, 100 patients (mean age 62 years, 67 men) with predialysis chronic renal failure were randomized to 5 mg folic acid or placebo daily for 12 weeks. Endothelial function was assessed by measuring (1) endothelium-dependent dilation of the brachial artery, (2) combined serum nitrite/nitrate concentrations, and (3) plasma von Willebrand factor concentration. Baseline characteristics of the 2 groups were similar. At the end of the study, both serum and red cell folate concentrations were greater in the folic acid group than the placebo group [mean (95% CI) 39.0 (29.8 to 51.0) versus 7.7 (6.6 to 8.9) microg/L and 739 (613 to 891) versus 220 (184 to 262) microg/L, respectively; both P<0.001]. Despite a reduction in hyperhomocysteinemia in the folic acid group compared with the placebo group [15.1 (14.1 to 16.2) versus 20.1 (18.2 to 22.2) micromol/L; P<0.001], there were no significant differences in endothelium-dependent dilation, combined serum nitrite/nitrate concentrations, or plasma von Willebrand factor concentration between the 2 groups. CONCLUSIONS: High-dose folic acid lowers but fails to normalize hyperhomocysteinemia in patients with predialysis chronic renal failure. This was not accompanied by an improvement of endothelial function and suggests that treatment with folic acid may not reduce the burden of vascular disease in uremia.


Assuntos
Endotélio Vascular/efeitos dos fármacos , Ácido Fólico/uso terapêutico , Hematínicos/uso terapêutico , Homocisteína/sangue , Falência Renal Crônica/tratamento farmacológico , Idoso , Artéria Braquial/diagnóstico por imagem , Artéria Braquial/efeitos dos fármacos , Artéria Braquial/fisiopatologia , Método Duplo-Cego , Endotélio Vascular/fisiopatologia , Eritrócitos/metabolismo , Feminino , Ácido Fólico/sangue , Humanos , Falência Renal Crônica/sangue , Falência Renal Crônica/fisiopatologia , Masculino , Pessoa de Meia-Idade , Nitratos/sangue , Nitritos/sangue , Placebos , Estudos Prospectivos , Diálise Renal , Ultrassonografia , Vasodilatação/efeitos dos fármacos , Fator de von Willebrand/metabolismo
11.
J Am Coll Cardiol ; 37(7): 1858-63, 2001 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-11401123

RESUMO

OBJECTIVES: This study was designed to determine the effects of folic acid therapy on endothelial function in patients with coronary artery disease (CAD). BACKGROUND: Hyperhomocysteinemia, a risk factor for CAD, may cause atherosderosis by oxidative endothelial injury. Folic acid reduces plasma homocysteine, but the effect on adverse vascular events is unknown. METHODS: In a double-blind placebo-controlled trial, 90 patients (mean age [range] 63 [46 to 79] years, 79 men) with CAD were randomized to either folic acid 5 mg or placebo daily for 12 weeks. Endothelial function was assessed by measuring: 1) flow-mediated endothelium-dependent dilation (EDD) of the brachial artery; 2) combined serum nitrite/nitrate (NOx) concentrations and; 3) plasma von Willebrand factor (vWF) concentration. RESULTS: At the end of the study, plasma homocysteine was lower in the folic acid group compared with the placebo group (mean [95% confidence interval] 9.3 (8.5 to 10.1) vs. 12.3 [11.3 to 13.4] micromol/l, p < 0.001). Although there were no significant differences in EDD, serum NOx or plasma vWF between the two groups, there was a greater increase in EDD from baseline in the folic acid group compared to placebo (1.2 [0.7 to 1.8] vs. 0.4 [-0.3 to 1.1]%, p = 0.07). CONCLUSIONS: Folic acid reduced plasma homocysteine and was associated with a trend toward improved endothelial function in patients with CAD. The absence of an unequivocally positive result may have been due to inadequate sample size or chance. This reinforces the need for the results of large randomized controlled trials before the implementation of routine folic acid supplementation.


Assuntos
Doença das Coronárias/tratamento farmacológico , Doença das Coronárias/fisiopatologia , Endotélio Vascular/efeitos dos fármacos , Endotélio Vascular/fisiopatologia , Ácido Fólico/uso terapêutico , Homocisteína/sangue , Idoso , Doença das Coronárias/sangue , Método Duplo-Cego , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Nitratos/sangue , Nitritos/sangue , Fluxo Sanguíneo Regional , Fator de von Willebrand/análise
12.
J R Soc Interface ; 12(106)2015 May 06.
Artigo em Inglês | MEDLINE | ID: mdl-25808336

RESUMO

The aim of this study was to quantify connective tissue fibre orientation and alignment in young, old and glaucomatous human optic nerve heads (ONH) to understand ONH microstructure and predisposition to glaucomatous optic neuropathy. Transverse (seven healthy, three glaucomatous) and longitudinal (14 healthy) human ONH cryosections were imaged by both second harmonic generation microscopy and small angle light scattering (SALS) in order to quantify preferred fibre orientation (PFO) and degree of fibre alignment (DOFA). DOFA was highest within the peripapillary sclera (ppsclera), with relatively low values in the lamina cribrosa (LC). Elderly ppsclera DOFA was higher than that in young ppsclera (p < 0.00007), and generally higher than in glaucoma ppsclera. In all LCs, a majority of fibres had preferential orientation horizontally across the nasal-temporal axis. In all glaucomatous LCs, PFO was significantly different from controls in a minimum of seven out of 12 LC regions (p < 0.05). Additionally, higher fibre alignment was observed in the glaucomatous inferior-temporal LC (p < 0.017). The differences between young and elderly ONH fibre alignment within regions suggest that age-related microstructural changes occur within the structure. The additional differences in fibre alignment observed within the glaucomatous LC may reflect an inherent susceptibility to glaucomatous optic neuropathy, or may be a consequence of ONH remodelling and/or collapse.


Assuntos
Envelhecimento/patologia , Colágenos Fibrilares/ultraestrutura , Glaucoma/patologia , Imageamento Tridimensional/métodos , Microscopia/métodos , Disco Óptico/ultraestrutura , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Feminino , Humanos , Interpretação de Imagem Assistida por Computador/métodos , Masculino , Conformação Molecular , Imagem Molecular/métodos , Disco Óptico/patologia , Reprodutibilidade dos Testes , Espalhamento a Baixo Ângulo , Sensibilidade e Especificidade , Adulto Jovem
13.
Am J Kidney Dis ; 38(3): 537-46, 2001 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-11532686

RESUMO

Patients with chronic renal impairment (CRI) are at greatly increased risk for premature vascular disease; however, little is known about its evolution. This paper describes a cohort of patients with CRI and reports study design, baseline demographic and biochemical data, and comparisons with two contemporaneous age- and sex-matched control groups, one with established coronary artery disease and the other without overt vascular disease. Among 369 individuals (median age, 63 years; range, 18 to 88 years; 67% men) with CRI, 34% had a history of vascular disease and 21% had electrocardiographic left ventricular hypertrophy (LVH). Even in those with mild renal impairment (serum creatinine < 2.1 mg/dL), approximately one third had vascular disease and 12% had LVH. A history of hypertension was present in 76% of the CRI group, but as compared with controls, systolic and diastolic blood pressures were not elevated. Low-density lipoprotein (LDL) cholesterol concentration also was not elevated, but CRI was associated with elevated serum triglyceride and plasma homocysteine levels and reduced high-density lipoprotein (HDL) cholesterol, hemoglobin, and serum albumin concentrations. Across the spectrum of CRI, more severe renal dysfunction was associated with lower levels of diastolic blood pressure, LDL and HDL cholesterol, albumin, and hemoglobin, but increased levels of plasma homocysteine. This cross-sectional analysis shows that vascular disease is common in individuals with mild CRI attending a nephrology program and also suggests trends in the levels of a number of potential vascular risk factors with respect to severity of renal dysfunction. These results will be further quantified in a prospective biennial follow-up.


Assuntos
Doenças Cardiovasculares/etiologia , Falência Renal Crônica/complicações , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Biomarcadores/sangue , Pressão Sanguínea , Doenças Cardiovasculares/sangue , Doenças Cardiovasculares/epidemiologia , Transtornos Cerebrovasculares/sangue , Transtornos Cerebrovasculares/epidemiologia , Transtornos Cerebrovasculares/etiologia , HDL-Colesterol/sangue , Estudos de Coortes , Doença das Coronárias/sangue , Doença das Coronárias/epidemiologia , Doença das Coronárias/etiologia , Creatinina/sangue , Estudos Transversais , Diabetes Mellitus/epidemiologia , Feminino , Hemoglobina A/análise , Homocisteína/sangue , Humanos , Hipertrofia Ventricular Esquerda/sangue , Hipertrofia Ventricular Esquerda/epidemiologia , Hipertrofia Ventricular Esquerda/etiologia , Falência Renal Crônica/sangue , Masculino , Pessoa de Meia-Idade , Estado Nutricional , Doenças Vasculares Periféricas/sangue , Doenças Vasculares Periféricas/epidemiologia , Doenças Vasculares Periféricas/etiologia , Prevalência , Estudos Prospectivos
14.
Heart ; 83(2): 205-9, 2000 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-10648498

RESUMO

BACKGROUND: Endothelial dysfunction plays an important role in the development of atherosclerotic vascular disease, which is the leading cause of mortality in patients with chronic renal failure. OBJECTIVE: To examine the relation between predialysis renal failure and endothelial function. DESIGN: Two groups were studied: 80 patients with non-diabetic chronic renal failure and 26 healthy controls, with similar age and sex distributions. Two indices of endothelial function were assessed: high resolution ultrasonography to measure flow mediated endothelium dependent dilatation of the brachial artery following reactive hyperaemia, and plasma concentration of von Willebrand factor. Endothelium independent dilatation was also assessed following sublingual glyceryl trinitrate. The patients were divided into those with and without overt atherosclerotic vascular disease. RESULTS: Although patients with chronic renal failure had significantly impaired endothelium dependent dilatation compared with controls (median (interquartile range), 2.6% (0.7% to 4.8%) v 6.5% (4.8% to 8.3%); p < 0.001) and increased von Willebrand factor (254 (207 to 294) v 106 (87 to 138) iu/dl; p < 0.001), there was no difference between renal failure patients with and without atherosclerotic vascular disease. Within the chronic renal failure group, endothelium dependent dilatation and von Willebrand factor were similar in patients in the upper and lower quartiles of glomerular filtration rate (2.7% (0.7% to 6.7%) v 2.8% (1.1% to 5.0%); and 255 (205 to 291) v 254 (209 to 292) iu/dl, respectively). Endothelium independent dilatation did not differ between the renal failure or control groups and was also similar in patients with renal failure irrespective of the degree of renal failure or the presence of atherosclerotic vascular disease. CONCLUSIONS: Endothelial function is abnormal in chronic renal failure, even in patients with mild renal insufficiency and those without atherosclerotic vascular disease, suggesting that uraemia may directly promote the development of atherosclerosis early in the progression of chronic renal failure.


Assuntos
Arteriosclerose/fisiopatologia , Endotélio Vascular/fisiopatologia , Falência Renal Crônica/fisiopatologia , Arteriosclerose/sangue , Arteriosclerose/diagnóstico por imagem , Estudos de Casos e Controles , Endotélio Vascular/diagnóstico por imagem , Feminino , Humanos , Falência Renal Crônica/sangue , Falência Renal Crônica/diagnóstico por imagem , Masculino , Ultrassonografia , Fator de von Willebrand/análise
15.
Ann R Coll Surg Engl ; 80(1): 40-5, 1998 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-9579126

RESUMO

Fifty-nine evacuating proctograms were performed over a 4 month period. We sought to identify how useful this technique is in diagnosing the cause of various anorectal symptoms and indicating which treatment option may be beneficial to the patient. The main reasons for referral were faecal soiling (60%) and obstructed defaecation (47%). Of the proctograms, 90% revealed some pathology. The most common abnormalities detected were rectocele (56%), rectal intussusception (39%), enterocele (19%) and rectal prolapse (12%). Of the patients, 45% were treated with an operation specific to the pathology detected on the proctogram; 29% did not require any active treatment and the remainder were managed with biofeedback conditioning or injection sclerotherapy. Evacuating proctography is of value in providing a diagnosis in patients with anorectal symptoms and thereby allowing specific treatment, operative or nonoperative, to be directed to the underlying pathology.


Assuntos
Defecografia , Auditoria Médica , Doenças Retais/diagnóstico por imagem , Adulto , Idoso , Idoso de 80 Anos ou mais , Constipação Intestinal/diagnóstico por imagem , Incontinência Fecal/diagnóstico por imagem , Feminino , Hérnia/diagnóstico por imagem , Humanos , Intussuscepção/diagnóstico por imagem , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Prolapso Retal/diagnóstico por imagem
16.
N Z Med J ; 88(622): 322-5, 1978 Oct 25.
Artigo em Inglês | MEDLINE | ID: mdl-282483

RESUMO

Forty-one children with asthma and their parents were interviewed to assess their level of understanding of the disease, drug therapy and prognosis, to define their fears and anxieties and to elucidate the extent to which asthma had interfered with activities and family life. Knowledge of the disease and its natural history was poor, understanding of drug therapy inadequate and anxieties relating to death, separation, permanent lung damage, curtailment of activities were common.


Assuntos
Asma/terapia , Adolescente , Ansiedade/etiologia , Asma/tratamento farmacológico , Asma/psicologia , Broncodilatadores/uso terapêutico , Criança , Doença Crônica , Família , Humanos , Pais/educação , Relações Médico-Paciente , Prognóstico
17.
Mar Pollut Bull ; 74(1): 231-6, 2013 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-23916411

RESUMO

Selenium's (Se) protective effects against mercury (Hg) toxicity have been demonstrated; however, this is seldom considered in health assessments, where dietary exposure is still evaluated by Hg concentration alone. Se:Hg ratios and selenium health benefit values (Se HBVs) offer a more comprehensive seafood safety model. Here we describe total mercury (THg), methylmercury (MeHg) and Se concentrations in fish from a Hg-polluted estuary. Spatial variation in THg, MeHg and Se was evident, though all regions maintained Se:Hg ratio values >1. Se HBV varied between regions and in one region mean negative values (-5.17) were evident. This study provides the first evidence that quoting a single all-encompassing Se HBV is not appropriate when species demonstrate strong site fidelity. It highlights the need for research into Se-Hg relationships in environments with established Hg pollution and reinforces the assertion that Se concentration be considered in assessments of human health risk to Hg exposure.


Assuntos
Exposição Ambiental/estatística & dados numéricos , Peixes/metabolismo , Mercúrio/análise , Selênio/análise , Poluentes Químicos da Água/análise , Animais , Monitoramento Ambiental , Humanos , Mercúrio/metabolismo , Medição de Risco , Selênio/metabolismo , Poluentes Químicos da Água/metabolismo
20.
Eur J Vasc Endovasc Surg ; 14(6): 430-2, 1997 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-9467515

RESUMO

Restless legs syndrome is also known as Ekbom's syndrome, following his description in 1944, although the earliest known description dates from 1685 (Willis). It is a fairly common complaint which is not widely recognised by the medical profession. It gives the sufferer an unpleasant sensation in the legs at rest, causing an irresistible desire to move, which alleviates the discomfort.


Assuntos
Síndrome das Pernas Inquietas , Idoso , Feminino , Humanos , Incidência , Masculino , Síndrome das Pernas Inquietas/diagnóstico , Síndrome das Pernas Inquietas/epidemiologia , Síndrome das Pernas Inquietas/terapia
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