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1.
Pediatr Surg Int ; 40(1): 154, 2024 Jun 09.
Artigo em Inglês | MEDLINE | ID: mdl-38852109

RESUMO

PURPOSE: To characterise the investigations, management and ultimate diagnosis of neonates with distal intestinal obstruction. METHODS: Retrospective review of term (> 37 weeks) neonates with admission diagnosis of distal intestinal obstruction over 10 years (2012-2022). Patient pathways were identified and associations between presentations, response to treatments and outcome investigated. RESULTS: A total of 124 neonates were identified and all included. Initial management was colonic irrigation in 108, contrast enema in 4, and laparotomy in 12. Of those responding to irrigations none underwent contrast enema. Ultimately, 22 neonates proceeded to laparotomy. Overall, 106 had a suction rectal biopsy and 41 had genetic testing for cystic fibrosis. Final diagnosis was Hirschsprung disease (HD) in 67, meconium ileus with cystic fibrosis (CF) in 9, meconium plug syndrome in 19 (including 3 with CF), intestinal atresia in 10 and no formal diagnosis in 17. Median length of neonatal unit stay was 11 days (7-19). CONCLUSIONS: Initial management of neonates with distal bowel obstruction should be colonic irrigation since this is therapeutic in the majority and significantly reduces the need for contrast enema. These infants should all have suction rectal biopsy to investigate for HD unless another diagnosis is evident. If a meconium plug is passed, testing for CF is recommended. Evaluation and therapy are multimodal and time consuming, placing burden on resources and families.


Assuntos
Meios de Contraste , Enema , Obstrução Intestinal , Humanos , Recém-Nascido , Estudos Retrospectivos , Obstrução Intestinal/etiologia , Obstrução Intestinal/terapia , Obstrução Intestinal/diagnóstico , Enema/métodos , Masculino , Feminino , Irrigação Terapêutica/métodos , Laparotomia/métodos , Resultado do Tratamento
2.
Plast Reconstr Surg Glob Open ; 12(5): e5802, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38746946

RESUMO

Background: Capsular contracture (CC) is a leading cause of morbidity in implant-based breast surgery. Implant surface texture has been implicated in CC development, yet its etiopathogenesis remains unclear. We conducted a systematic review to determine the influence of implant surface texture on cellular and molecular mechanisms involved in the etiopathogenesis of CC. Methods: A systematic review of the MEDLINE, Embase, Web of Science, and Scopus databases was completed to examine the influence of implant texture on cellular and molecular pathways leading to CC. Excluded articles were reviews and those examining solely the clinical presentation of CC. Results: Development of CC includes prolonged inflammation, increased myofibroblast density, parallel arrangement of collagen fibers, and biofilm formation. When compared with textured implants, smooth implants are associated with reduction in parallel collagen, capsule thickness, and sheer frictional force. Microtextured implants trigger a reduced macrophage response and decreased fibroblast activation as compared with smooth and macrotextured surfaces. Bacterial counts on microtextured and smooth surfaces are significantly lower than that of macrotextured surfaces. Both micro- and macrotextured implants have increased matrix metalloproteinases and activation of tumor necrosis factor α pathway, with increased activation of the transforming growth factor ß1 pathway relative to smooth implants. Conclusions: Implant surface texture alters the cellular and molecular mechanisms in the chronic inflammatory process leading to CC. Given the complex biological system of cellular and molecular events in CC, a mathematical model integrating these influences may be optimal to deduce the etiopathogenesis.

3.
Biology (Basel) ; 11(8)2022 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-35892952

RESUMO

Thin, strong scaffold materials are needed for surgical applications. New materials are required, particularly those readily available, such as from non-human sources. Bovine amniotic membrane (antepartum) and equine amniotic membrane (postpartum) were characterized with tear and tensile tests. The structural arrangement of the collagen fibrils was determined by small-angle X-ray scattering, scanning electron microscopy, and ultrasonic imaging. Bovine amnion had a thickness-normalized tear strength of 12.6 (3.8) N/mm, while equine amnion was 14.8 (5.3) N/mm. SAXS analysis of the collagen fibril arrangement yielded an orientation index of 0.587 (0.06) and 0.681 (0.05) for bovine and equine, respectively. This may indicate a relationship between more highly aligned collagen fibrils and greater strength, as seen in other materials. Amnion from bovine or equine sources are strong, thin, elastic materials, although weaker than other collagen tissue materials commonly used, that may find application in surgery as an alternative to material from human donors.

4.
Int J Biol Macromol ; 216: 140-147, 2022 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-35793742

RESUMO

Type I collagen is a ubiquitous structural protein in animal tissues. It is normally present in a hydrated form. However, collagen is very dependent on associated water for its mechanical properties. In skin, where type I collagen is dominant, there is a longstanding concern that the skin and therefore collagen may partially dry out and result in structural degradation. Here we show that dehydration of type I collagen fibrils, using 2-propanol, results in a two-stage dehydration process. Initially, the fibrils do not change length, i.e. the D-period remains constant, but shrinkage occurs within the fibrils by an increase in the gap region and a decrease in the overlap region within a D-band and a shortening of the helical turn distance and fibril diameter. Only with further dehydration does the length of the collagen fibril decrease (a decrease in D-period). This mechanism explains why collagen materials are resistant to gross structural change in the early stages of dehydration and shows why they may then suffer from sudden external shrinkage with further dehydration.


Assuntos
Colágeno Tipo I , Desidratação , Animais , Colágeno/química , Matriz Extracelular/metabolismo , Pele/metabolismo
5.
Influenza Other Respir Viruses ; 16(6): 1122-1132, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-35672928

RESUMO

BACKGROUND: Human Parainfluenza viruses (HPIV) comprise of four members of the genetically distinct genera of Respirovirus (HPIV1&3) and Orthorubulavirus (HPIV2&4), causing significant upper and lower respiratory tract infections worldwide, particularly in children. However, despite frequent molecular diagnosis, they are frequently considered collectively or with HPIV4 overlooked entirely. We therefore investigated clinical and viral epidemiological distinctions of the relatively less prevalent Orthorubulaviruses HPIV2&4 at a regional UK hospital across four autumn/winter epidemic seasons. METHODS: A retrospective audit of clinical features of all HPIV2 or HPIV4 RT-PCR-positive patients, diagnosed between 1st September 2013 and 12th April 2017 was undertaken, alongside sequencing of viral genome fragments in a representative subset of samples. RESULTS: Infection was observed across all age groups, but predominantly in children under nine and adults over 40, with almost twice as many HPIV4 as HPIV2 cases. Fever, abnormal haematology, elevated C-reactive protein and hospital admission were more frequently seen in HPIV2 than HPIV4 infection. Each of the four seasonal peaks of either HPIV2, HPIV4 or both, closely matched that of RSV, occurring in November and December and preceding that of Influenza A. A subset of viruses were partially sequenced, indicating co-circulation of multiple subtypes of both HPIV2&4, but with little variation between each epidemic season or from limited global reference sequences. CONCLUSIONS: Despite being closest known genetic relatives, our data indicates a potential difference in associated disease between HPIV2 and HPIV4, with more hospitalisation seen in HPIV2 mono-infected individuals, but a greater overall number of HPIV4 cases.


Assuntos
Infecções por Paramyxoviridae , Infecções Respiratórias , Adulto , Proteína C-Reativa , Criança , Genômica , Humanos , Epidemiologia Molecular , Vírus da Parainfluenza 1 Humana/genética , Vírus da Parainfluenza 2 Humana/genética , Vírus da Parainfluenza 3 Humana/genética , Infecções por Paramyxoviridae/diagnóstico , Infecções por Paramyxoviridae/epidemiologia , Infecções Respiratórias/epidemiologia , Estudos Retrospectivos , Reino Unido/epidemiologia
6.
Microb Genom ; 8(5)2022 05.
Artigo em Inglês | MEDLINE | ID: mdl-35532121

RESUMO

Enterovirus D68 (EV-D68) has recently been identified in biennial epidemics coinciding with diagnoses of non-polio acute flaccid paralysis/myelitis (AFP/AFM). We investigated the prevalence, genetic relatedness and associated clinical features of EV-D68 in 193 EV-positive samples from 193 patients in late 2018, UK. EV-D68 was detected in 83 (58 %) of 143 confirmed EV-positive samples. Sequencing and phylogenetic analysis revealed extensive genetic diversity, split between subclades B3 (n=50) and D1 (n=33), suggesting epidemiologically unrelated infections. B3 predominated in children and younger adults, and D1 in older adults and the elderly (P=0.0009). Clinical presentation indicated causation or exacerbation of respiratory distress in 91.4 % of EV-D68-positive individuals, principally cough (75.3 %), shortness of breath (56.8 %), coryza (48.1 %), wheeze (46.9 %), supplemental oxygen required (46.9 %) and fever (38.9 %). Two cases of AFM were observed, one with EV-D68 detectable in the cerebrospinal fluid, but otherwise neurological symptoms were rarely reported (n=4). Both AFM cases and all additional instances of intensive care unit (ICU) admission (n=5) were seen in patients infected with EV-D68 subclade B3. However, due to the infrequency of severe infection in our cohort, statistical significance could not be assessed.


Assuntos
Enterovirus Humano D , Infecções por Enterovirus , Epidemias , Idoso , Viroses do Sistema Nervoso Central , Criança , Enterovirus Humano D/genética , Infecções por Enterovirus/diagnóstico , Infecções por Enterovirus/epidemiologia , Variação Genética , Humanos , Mielite , Doenças Neuromusculares , Filogenia , Reino Unido/epidemiologia
7.
Qual Health Res ; 32(5): 744-754, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35152801

RESUMO

Research exploring the benefits of humor for caregivers is limited and, to date, no qualitative studies have explored the role of humor in brain cancer caregiving. To address this gap, we analyzed transcripts from twenty-one in-depth telephone interviews conducted with brain cancer caregivers from a strengths perspective. Thematic analysis using Braun and Clarke's method revealed that humor functions as (1) an innate element of the self and relationship, (2) an expression of mutual connection and understanding, (3) a way of managing difficult or awkward moments, (4) a form of avoidance or a welcome distraction, and may be (5) helpful, or unhelpful, depending on where someone is in the brain cancer trajectory. Findings suggest that humor represents an important yet complex individual and family strength for health service providers to identify and build upon.


Assuntos
Neoplasias Encefálicas , Riso , Neoplasias Encefálicas/terapia , Cuidadores , Humanos , Pesquisa Qualitativa
8.
Health Soc Care Community ; 30(3): 869-887, 2022 05.
Artigo em Inglês | MEDLINE | ID: mdl-34633723

RESUMO

Expanding on the limited work in supportive care for friends and family caregivers of adults with a primary brain tumour, this review sought to examine all available evidence since 2010 on the efficacy and feasibility of supportive interventions for this population including non-controlled studies. A systematic review of the literature was conducted on the feasibility and effectiveness/efficacy of supportive interventions for brain cancer caregivers in line with PRISMA guidelines. 13 studies met the eligibility criteria and were identified for inclusion. Most interventions employed tailored psychoeducation, and expert involvement via psychotherapy or care coordination. Only two interventions demonstrated clinically significant improvements. Findings indicate that dyadic yoga programs, and programs that enhance caregiver mastery to manage patient behavioural problems, may lead to improvements in some clinical outcomes. Results highlight the diverse nature of supportive interventions and indicate that support for primary brain tumour caregivers is currently suboptimal. Our findings illustrate an overall low certainty of evidence, with a need for more adequately powered randomised controlled trials. As the complexities of brain cancer care-giving are an obstacle to standardised interventions, this review underscores the need for future trials to incorporate complimentary qualitative research methodologies.


Assuntos
Neoplasias Encefálicas , Amigos , Adulto , Neoplasias Encefálicas/terapia , Cuidadores , Humanos , Sistemas de Apoio Psicossocial
9.
J Gen Virol ; 102(6)2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-34130773

RESUMO

In the early phases of the SARS coronavirus type 2 (SARS-CoV-2) pandemic, testing focused on individuals fitting a strict case definition involving a limited set of symptoms together with an identified epidemiological risk, such as contact with an infected individual or travel to a high-risk area. To assess whether this impaired our ability to detect and control early introductions of the virus into the UK, we PCR-tested archival specimens collected on admission to a large UK teaching hospital who retrospectively were identified as having a clinical presentation compatible with COVID-19. In addition, we screened available archival specimens submitted for respiratory virus diagnosis, and dating back to early January 2020, for the presence of SARS-CoV-2 RNA. Our data provides evidence for widespread community circulation of SARS-CoV-2 in early February 2020 and into March that was undetected at the time due to restrictive case definitions informing testing policy. Genome sequence data showed that many of these early cases were infected with a distinct lineage of the virus. Sequences obtained from the first officially recorded case in Nottinghamshire - a traveller returning from Daegu, South Korea - also clustered with these early UK sequences suggesting acquisition of the virus occurred in the UK and not Daegu. Analysis of a larger sample of sequences obtained in the Nottinghamshire area revealed multiple viral introductions, mainly in late February and through March. These data highlight the importance of timely and extensive community testing to prevent future widespread transmission of the virus.


Assuntos
COVID-19/diagnóstico , COVID-19/virologia , Sistema Respiratório/virologia , SARS-CoV-2/isolamento & purificação , Adulto , Idoso , COVID-19/epidemiologia , COVID-19/transmissão , Teste de Ácido Nucleico para COVID-19 , Feminino , Humanos , Masculino , Programas de Rastreamento/métodos , Pessoa de Meia-Idade , Filogenia , RNA Viral/genética , Estudos Retrospectivos , SARS-CoV-2/genética , Reino Unido/epidemiologia
10.
J Med Internet Res ; 23(5): e18500, 2021 05 31.
Artigo em Inglês | MEDLINE | ID: mdl-34057427

RESUMO

BACKGROUND: Theory-guided approaches to implementation science have informed translation efforts and the acceptance of eHealth (digital health) interventions in clinical care. However, there is scarce evidence on which theories are best suited to addressing the inherent complexity of eHealth implementation. OBJECTIVE: The objectives of this systematic review are to identify theories that inform and explain eHealth implementation and to classify these theories using the typology by Sovacool and Hess for theories of sociotechnical change. METHODS: An electronic search was conducted in the PsycINFO, MEDLINE, Embase, CINAHL, Scopus, Sociological Source Ultimate, Web of Science, ABI/INFORM, EBSCO, and ProQuest databases in June 2019. Studies were included if they were published between 2009 and June 2019; were written in English; reported on empirical research, regardless of study or publication type; reported on one or more theories in the context of eHealth implementation; and were published in a peer-reviewed journal. A total of 2 reviewers independently assessed the titles, abstracts, and full texts. Theories identified were classified using a typology for theories of sociotechnical change, which was considered a useful tool for ordering and analyzing the diverse theoretical approaches as a basis for future theory building. RESULTS: Of the 13,101 potentially relevant titles, 119 studies were included. The review identified 36 theories used to explain implementation approaches in eHealth. The most commonly used approaches were the Technology Acceptance Model (TAM) (n=33) and the Unified Theory of Acceptance and Use of Technology (UTAUT) (n=32). These theories were primarily concerned with individual and interpersonal elements of eHealth acceptance. Less common were theories that reflect the various disorderly social processes and structural dimensions of implementation, such as the normalization process theory (n=17) and the structuration theory (n=6). CONCLUSIONS: Theories currently informing the implementation of eHealth interventions predominantly focus on predicting or explaining end-user acceptance. Theoretical perspectives that capture the dense and intricate relationships and structures required to enact sustainable change are less well represented in the eHealth literature. Given the growing acknowledgment of the inherent complexity of eHealth implementation, future research should develop and test models that recognize and reflect the multidimensional, dynamic, and relational nature of this process.


Assuntos
Telemedicina , Envio de Mensagens de Texto , Humanos
11.
J Med Microbiol ; 70(3)2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33734960

RESUMO

Introduction. The COVID-19 pandemic, which began in 2020 is testing economic resilience and surge capacity of healthcare providers worldwide. At the time of writing, positive detection of the SARS-CoV-2 virus remains the only method for diagnosing COVID-19 infection. Rapid upscaling of national SARS-CoV-2 genome testing presented challenges: (1) Unpredictable supply chains of reagents and kits for virus inactivation, RNA extraction and PCR-detection of viral genomes. (2) Rapid time to result of <24 h is required in order to facilitate timely infection control measures.Hypothesis. Extraction-free sample processing would impact commercially available SARS-CoV-2 genome detection methods.Aim. We evaluated whether alternative commercially available kits provided sensitivity and accuracy of SARS-CoV-2 genome detection comparable to those used by regional National Healthcare Services (NHS).Methodology. We tested several detection methods and tested whether detection was altered by heat inactivation, an approach for rapid one-step viral inactivation and RNA extraction without chemicals or kits.Results. Using purified RNA, we found the CerTest VIASURE kit to be comparable to the Altona RealStar system currently in use, and further showed that both diagnostic kits performed similarly in the BioRad CFX96 and Roche LightCycler 480 II machines. Additionally, both kits were comparable to a third alternative using a combination of Quantabio qScript one-step Quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR) mix and Centre for Disease Control and Prevention (CDC)-accredited N1 and N2 primer/probes when looking specifically at borderline samples. Importantly, when using the kits in an extraction-free protocol, following heat inactivation, we saw differing results, with the combined Quantabio-CDC assay showing superior accuracy and sensitivity. In particular, detection using the CDC N2 probe following the extraction-free protocol was highly correlated to results generated with the same probe following RNA extraction and reported clinically (n=127; R2=0.9259).Conclusion. Our results demonstrate that sample treatment can greatly affect the downstream performance of SARS-CoV-2 diagnostic kits, with varying impact depending on the kit. We also showed that one-step heat-inactivation methods could reduce time from swab receipt to outcome of test result. Combined, these findings present alternatives to the protocols in use and can serve to alleviate any arising supply-chain issues at different points in the workflow, whilst accelerating testing, and reducing cost and environmental impact.


Assuntos
Teste de Ácido Nucleico para COVID-19 , COVID-19/diagnóstico , SARS-CoV-2/isolamento & purificação , Manejo de Espécimes/métodos , Meios de Cultura , Temperatura Alta , Humanos , RNA Viral/genética , RNA Viral/isolamento & purificação , Kit de Reagentes para Diagnóstico , SARS-CoV-2/genética , Sensibilidade e Especificidade , Inativação de Vírus
12.
BMC Res Notes ; 14(1): 78, 2021 Feb 27.
Artigo em Inglês | MEDLINE | ID: mdl-33640024

RESUMO

OBJECTIVE: Small angle X-ray scattering (SAXS) analysis is a sensitive way of determining the ultrastructure of collagen in tissues. Little is known about how parameters measured by SAXS are affected by preservatives commonly used to prevent autolysis. We determined the effects of formalin, glutaraldehyde, Triton X and saline on measurements of fibril diameter, fibril diameter distribution, and D-spacing of corneal collagen using SAXS analysis. RESULTS: Compared to sections of sheep and cats' corneas stored frozen as controls, those preserved in 5% glutaraldehyde and 10% formalin had significantly larger mean collagen fibril diameters, increased fibril diameter distribution and decreased D-spacing. Sections of corneas preserved in Triton X had significantly increased collagen fibril diameters and decreased fibril diameter distribution. Those preserved in 0.9% saline had significantly increased mean collagen fibril diameters and decreased diameter distributions. Subjectively, the corneas preserved in 5% glutaraldehyde and 10% formalin maintained their transparency but those in Triton X and 0.9% saline became opaque. Subjective morphological assessment of transmission electron microscope images of corneas supported the SAXS data. Workers using SAXS analysis to characterize collagen should be alerted to changes that can be introduced by common preservatives in which their samples may have been stored.


Assuntos
Colágeno , Córnea , Animais , Gatos , Projetos Piloto , Espalhamento a Baixo Ângulo , Ovinos , Difração de Raios X , Raios X
13.
Turk J Urol ; 46(6): 481-487, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33052832

RESUMO

OBJECTIVE: This study aimed to identify the complication rate, specifically bleeding, in patients who received anticoagulation undergoing intravesical botulinum toxin A injections. MATERIAL AND METHODS: This study included all patients (n=430) undergoing intravesical injection of botulinum toxin A in a single secondary care center between January 2013 and December 2018. We recorded the use of anticoagulants/antiplatelets and complications. Logistic regression was used to investigate the association between anticoagulant/antiplatelet use and the complications arising, while controlling for age and sex. RESULTS: We identified 430 procedures in 94 men and 336 women (mean age, 60 years). A total of 79 patients received anticoagulants (18%). Aspirin was the most common anticoagulant (52%). Complication rate in anticoagulated patients was 6% (n=5), and it was 2% in those not on anticoagulants/antiplatelets (n=7). Complications were over 3 times more likely in patients who received anticoagulants/antiplatelets (odds ratio=3.233; 95% confidence interval=0.873, 11.38; p=0.067). There was no difference in the complications between patients with idiopathic symptoms and those with neuropathic overactive bladder. No patients required further surgical intervention, and all except 1 were Clavien-Dindo grade I-II with no mortalities. CONCLUSION: Anticoagulated patients undergoing intravesical injections have higher complication risks; however, the treatment outcome is unaffected with no significant morbidity/mortality. This is the first study to demonstrate safe outcomes for this subgroup and can assist in decision making and consenting.

14.
J Clin Virol ; 132: 104646, 2020 11.
Artigo em Inglês | MEDLINE | ID: mdl-32979770

RESUMO

BACKGROUND: Human enteroviruses (EV) are the leading cause of viral meningitis. EV genotyping is predominantly performed through amplification and sequencing of viral capsid protein-1 (VP1), frequently by national reference laboratories (NRLs). OBJECTIVE: To determine the frequency of genotyping failure in our NRL-submitted samples and apply a superior alternative assay to resolve untyped specimens. STUDY DESIGN: We initially audited genotyping data received for a cohort of patients in the East Midlands, UK by the NRL between 2013 and 2017, then identified an alternative RT-PCR typing method by literature review and evaluated primers from both assays in silico against comprehensive publicly available genomic data. The alternative assay was further optimised and applied to archived nucleic acids from previously untypable samples. RESULTS: Genotyping data showed a significant increase in untypable EV strains through the study period (p = 0.0073). Typing failure appeared unrelated to sample type or viral load. In silico analyses of 2,201 EV genomes showed high levels of mismatch between reference assay primers and clinically significant EV-species, in contrast to a selected alternative semi-nested RT-PCR VP1-typing assay. This alternative assay, with minor modifications, successfully genotyped 23 of 24 previously untypable yet viable archived specimens (EV-A, n = 4; EV-B, n = 19). Phylogenetic analyses identified no predominant strain within NRL untypable isolates, suggesting sub-optimal reference assay sensitivity across EV species, in agreement with in silico analyses. CONCLUSION: This modified highly sensitive RT-PCR assay presents a suitable alternative to the current English national reference VP1-typing assay and is recommended in other settings experiencing typing failure.


Assuntos
Infecções por Enterovirus , Enterovirus , Enterovirus/genética , Infecções por Enterovirus/diagnóstico , Infecções por Enterovirus/epidemiologia , Humanos , Laboratórios , Filogenia , Reino Unido
15.
Int J Nanomedicine ; 15: 5289-5298, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32821095

RESUMO

BACKGROUND: Type I collagen is the major component of the extracellular matrix of the knee's meniscus and plays a central role in that joint's biomechanical properties. Repair and reconstruction of tissue damage often requires a scaffold to assist the body to rebuild. The middle zone of bovine meniscus is a material that may be useful for the preparation of extracellular matrix scaffolds. METHODS: Here, synchrotron-based small-angle X-ray scattering (SAXS) patterns of bovine meniscus were collected during unconfined compression. Collagen fibril orientation, D-spacing, compression distance and force were measured. RESULTS: The collagen fibrils in middle zone meniscal fibrocartilage become more highly oriented perpendicular to the direction of compression. The D-spacing also increases, from 65.0 to 66.3 nm with compression up to 0.43 MPa, representing a 1.8% elongation of collagen fibrils perpendicular to the compression. CONCLUSION: The elasticity of the collagen fibrils under tension along their length when the meniscus is compressed, therefore, contributes to the overall elastic response of the meniscus only under loads that exceed those likely to be experienced physiologically.


Assuntos
Colágeno/química , Meniscos Tibiais/química , Meniscos Tibiais/fisiologia , Animais , Fenômenos Biomecânicos , Bovinos , Colágeno/metabolismo , Colágeno Tipo I/química , Colágeno Tipo I/metabolismo , Elasticidade , Masculino , Espalhamento a Baixo Ângulo , Estresse Mecânico , Síncrotrons , Difração de Raios X
16.
J Clin Virol ; 129: 104453, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32534437

RESUMO

BACKGROUND: Since its first isolation in 2005, Human Bocavirus (HBoV) has been repeatedly associated with acute respiratory tract infections, although its role in pathogenicity remains unclear due to high co-infection rates. OBJECTIVES: To assess HBoV prevalence and associated disease in a cohort of respiratory patients in the East Midlands, UK between 2015 and 2019. STUDY DESIGN: We initially investigated the undiagnosed burden of HBoV in a retrospective paediatric cohort sampled between 2015 and 2017 using an in-house PCR assay. HBoV was subsequently incorporated into the standard respiratory diagnostic pathway and we audited a calendar year of HBoV positive results between 2018 and 2019. RESULTS: Our retrospective PCR screening of previously routine diagnostic-negative samples from juvenile patients identified a 9% (n = 30) prevalence of HBoV type 1. These apparent HBoV1 mono-infections were frequently associated with respiratory tract symptoms, often severe requiring ventilation, oxygen and steroid intervention with 31% (n = 9) of individuals requiring intensive care. When HBoV screening was subsequently adopted into the routine respiratory diagnostic pathway, year-round infections were observed in both children and adults peaking in February. 185 of 9098 (2.03%) individuals were found to be HBoV positive with children aged 12-24 months the principally infected group. However, HBoV infection was also observed in patients aged over 60, predominantly as a mono-infection. 23% of the 185 unique patients were HBoV monoinfected and persistent low-level DNA positivity was observed in 15 individuals up to 6-months after initial presentation. CONCLUSION: HBoV1 is a prevalent respiratory infection in the UK capable of causing serious monoinfections.


Assuntos
Bocavirus Humano , Infecções por Parvoviridae , Infecções Respiratórias , Adulto , Criança , Escherichia coli , Humanos , Lactente , Estudos Retrospectivos , Reino Unido
17.
Int J Biol Macromol ; 137: 1020-1029, 2019 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-31295493

RESUMO

Arteries are elastic structures containing both elastin and collagen. While the high content of elastin is understood to be important for the elasticity of arteries with systolic and diastolic pressure pulses, the role of collagen in the elastic properties of arteries is less understood. Here we use small angle X-ray scattering to investigate the changes in arrangement of collagen fibrils and the strain experienced by collagen fibrils as arteries are inflated. Collagen fibrils re-orient to become more aligned in both the annular direction and radially as arteries inflate. With arterial pressures up to 32 kPa there is no observable increase in D-spacing of the collagen fibrils (<0.1%) indicating that there is no extension of straightened fibrils and therefore no change in stress on the collagen fibrils. This is in contrast to tissue such as skin where stress of the tissue may induce strains in collagen fibrils of >6%. In arteries the collagen fibril elasticity (strain at the scale of fibrils) is not the main elastic component of the arterial walls. This indicates that wall elasticity is dominated by other factors such as the structural arrangement of the collagen fibers.


Assuntos
Artérias , Colágeno/química , Fenômenos Mecânicos , Espalhamento a Baixo Ângulo , Difração de Raios X , Animais , Fenômenos Biomecânicos , Ovinos , Estresse Mecânico
18.
Vet Pathol ; 55(6): 861-870, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30071782

RESUMO

The authors used microscopy and synchrotron-based small-angle X-ray scattering analysis (SAXS) to describe lesions macroscopically typical of tropical keratopathy ("Florida spots") from 6 cats on St Kitts. Microscopically, there were varying degrees of epithelial hyperplasia and thinning of the cornea (by 4% to 18%) due to loss of corneal stroma associated with dense accumulations of collagen in the superficial stroma. The collagen fibrils in lesions were wider and had more variable diameters (39.5 ± 5.0 nm, mean ± SD) than in normal corneas (25.9 ± 3.6 nm; P < .01). There were occasional vacuoles (<1 µm) in the corneal epithelial basement membrane but no evidence of inflammation, edema, stromal neovascularization, fibrosis, acid-fast organisms, or structures suggestive of a fungal organism. SAXS analysis showed collagen fibril diameters and variation in size were greater in stroma containing the lesions compared to normal corneas (48.8 ± 4.5 nm vs 35.5 ± 2.6; P < .05). The d-spacing of collagen in the stroma of lesions and normal corneas was the same, but the average orientation index of collagen in lesions was greater (0.428 ± 0.08 vs 0.285 ± 0.03; P < .05). A survey revealed Florida spots lesions were static over time and became less obvious in only 1 of 6 affected cats adopted on St Kitts and taken to areas in the US where lesions are not reported. An anterior stromal collagen disorder with various degrees of epithelial hyperplasia is the pathologic hallmark of lesions clinically identical to Florida spots in cats from St Kitts.


Assuntos
Doenças do Gato/patologia , Doenças da Córnea/veterinária , Animais , Gatos , Doenças da Córnea/patologia , Substância Própria/patologia , Substância Própria/ultraestrutura , Feminino , Masculino , Microscopia Eletrônica de Transmissão/veterinária , São Cristóvão e Névis , Espalhamento a Baixo Ângulo , Pele/patologia , Difração de Raios X/métodos , Difração de Raios X/veterinária
19.
Phys Occup Ther Pediatr ; 38(4): 395-416, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-28922041

RESUMO

AIMS: To conduct a systematic review asking, does garment therapy improve motor function in children with cerebral palsy? METHODS: A systematic review with meta-analysis was conducted to review the literature. Inclusion criteria involved the wearing of therapy suits/garments in children with cerebral palsy. The primary outcome of interest was movement related function and secondary outcomes included impairment, participation, parental satisfaction and adverse outcomes of garment wear. RESULTS: 14 studies with 234 participants were included, of which 5 studies were included for meta-analysis. Garment therapy showed a nonsignificant effect on post-intervention function as measured by the Gross Motor Function Measure when compared to controls (MD = -1.9; 95% CI = -6.84, 3.05). Nonsignificant improvements in function were seen long-term (MD = -3.13; 95% CI = -7.57, 1.31). Garment therapy showed a significant improvement in proximal kinematics (MD = -5.02; 95% CI = -7.28, -2.76), however significant improvements were not demonstrated in distal kinematics (MD = -0.79; 95% CI = -3.08, 1.49). CONCLUSIONS: This review suggests garment therapy does not improve function in children with cerebral palsy. While garment therapy was shown to improve proximal stability, this benefit must be considered functionally and consider difficulties associated with garment use.


Assuntos
Paralisia Cerebral/terapia , Destreza Motora/fisiologia , Aparelhos Ortopédicos/efeitos adversos , Adolescente , Fenômenos Biomecânicos , Criança , Pré-Escolar , Vestuário , Feminino , Humanos , Lactente , Masculino , Satisfação do Paciente/estatística & dados numéricos , Recuperação de Função Fisiológica , Resultado do Tratamento
20.
Urolithiasis ; 46(2): 129-136, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-27324264

RESUMO

Short-term ureteric stents are commonly placed after ureteroscopy. The removal usually entails having a cystoscopy, but recently, endourologists have been using stents with extraction strings attached to them for ease of removal. We wanted to conduct a systematic review of literature looking at the outcomes of ureteric stents with extraction strings attached to them. Our objective was to investigate the use, morbidity, tolerability, complications, associated cost, and patient preference of stents with extraction strings attached to them. All studies in English language (between 1990 and 2015) where stents on extraction strings were either self-removed by patients or removed by physician were included. A total of eight studies (1279 patients) were included, of which 483 (38 %) patients had extraction strings for removal. There seemed to be no overall difference in pain scores or urinary symptoms between patients with and without extraction strings, but nearly 10 % of patients suffered stent dislodgement in the group with extraction strings attached. Overall stent dwell time was lower in patients who had their stents removed via extraction strings, and majority of them were able to remove their stents at home. Our study suggests that stents with extraction strings are easy for patient self-removal and can reduce the stent dwell time for patients, thus reducing the duration of morbidity and physical and financial burden to patients. However, this must be balanced against a risk of stent dislodgement and, hence, may not be a good option in all patients.


Assuntos
Remoção de Dispositivo/métodos , Dor/epidemiologia , Stents/efeitos adversos , Cálculos Ureterais/cirurgia , Ureteroscopia/instrumentação , Remoção de Dispositivo/efeitos adversos , Estudos de Viabilidade , Humanos , Dor/etiologia , Medição da Dor , Preferência do Paciente , Ureter/cirurgia , Ureteroscopia/efeitos adversos
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