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1.
J Food Sci ; 87(11): 4808-4819, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-36183162

RESUMEN

Increasing market demand for sustainable, environmentally friendly edible film materials has called for the development of new customizable production methods utilizing emerging technologies such as 3D printing. We hereby report a new method to generate functional edible soy protein isolate films prepared from three types of soybeans (AR-R11-7999, MO-S17-17168, and MO-S17-19874R) using an innovative 3D printing technology. The protein contents in AR-R11-7999, MO-S17-17168, and MO-S17-19874R soybean meals and their corresponding protein isolates were 40.0, 39.1, and 39.9; and 84.5, 84.7, and 87.3 % (w/w, dry basis), respectively. Response surface methodology was used to maximize the tensile and puncture strength and minimize the thickness of the 3D-printed edible films using protein concentration, plasticizer concentration (glycerol), and drying time as the independent variables. The optimized film production conditions were determined as soy protein concentration: 8.91%, plasticizer concentration: 3.00%, and drying time: 3.98 h with a desirability value of 0.7428. The optimized conditions were then successfully verified with the original soybean lot with a nonsignificant difference in physical properties. At the optimized conditions, the 3D-printed edible films using three soybean lots revealed: 0.108-0.114 mm thickness; 14.79-16.07 MPa tensile strength; 6.97-8.20 N puncture strength; 90.81-91.53, -1.89 to -1.31, and 14.85-17.25 were color parameters L*, a*, and b*, respectively; 1.22-1.36 g/cm3 density; and 104.4-105.7% elongation at break ratio (%). PRACTICAL APPLICATION: Edible soy protein films produced by an extrusion-based 3D printing approach are highly customizable and precise, and could be produced at an industrial scale. This newly produced environment-friendly soy protein-based edible film can serve as an alternate packaging to synthetic plastics and reduce the environmental landfill problem while adding value to soybean produced in the mid-south United States.


Asunto(s)
Glycine max , Proteínas de Soja , Plastificantes , Permeabilidad , Resistencia a la Tracción , Tecnología , Impresión Tridimensional , Embalaje de Alimentos
3.
BJS Open ; 5(3)2021 05 07.
Artículo en Inglés | MEDLINE | ID: mdl-34169311

RESUMEN

BACKGROUND: COVID-19 has had a global impact on all aspects of healthcare including surgical training. This study aimed to quantify the impact of COVID-19 on operative case numbers recorded by surgeons in training, and annual review of competency progression (ARCP) outcomes in the UK. METHODS: Anonymized operative logbook numbers were collated from electronic logbook and ARCP outcome data from the Intercollegiate Surgical Curriculum Programme database for trainees in the 10 surgical specialty training specialties.Operative logbook numbers and awarded ARCP outcomes were compared between predefined dates. Effect sizes are reported as incident rate ratios (IRR) with 95 per cent confidence intervals. RESULTS: Some 5599 surgical trainees in 2019, and 5310 in surgical specialty training in 2020 were included. The IRR was reduced across all specialties as a result of the COVID-19 pandemic (0.62; 95 per cent c.i. 0.60 to 0.64). Elective surgery (0.53; 95 per cent c.i. 0.50 to 0.56) was affected more than emergency surgery (0.85; 95 per cent c.i. 0.84 to 0.87). Regional variation indicating reduced operative activity was demonstrated across all specialties. More than 1 in 8 trainees in the final year of training have had their training extended and more than a quarter of trainees entering their final year of training are behind their expected training trajectory. CONCLUSION: The COVID-19 pandemic has had a major effect on surgical training in the UK. Urgent, coordinated action is required to minimize the impacts from the reduction in training in 2020.


Asunto(s)
COVID-19/epidemiología , Competencia Clínica , Pandemias , Especialidades Quirúrgicas/educación , Procedimientos Quirúrgicos Operativos/estadística & datos numéricos , Procedimientos Quirúrgicos Electivos/estadística & datos numéricos , Humanos , SARS-CoV-2 , Reino Unido
4.
Tech Coloproctol ; 25(5): 505-520, 2021 05.
Artículo en Inglés | MEDLINE | ID: mdl-33507436

RESUMEN

BACKGROUND: Coronavirus disease (COVID-19) has caused global disruption to health care. Non-urgent elective surgical cases have been cancelled, outpatient clinics have reduced and there has been a reduction in the number of patients presenting as an emergency. These factors will drastically affect the training opportunities of surgical trainees. The aim of this systematic review is to describe the impact of COVID-19 on surgical training globally. METHODS: The review was performed in line with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and registered with the Open Science Framework (OSF). Medline, EMBASE, PubMed and the Cochrane Central Register of Controlled Trials were searched. RESULTS: The searches identified 499 articles, 29 of which were included in the review. This contained data from more than 20 countries with 5260 trainees and 339 programme directors. Redeployment to non-surgical roles varied across studies from 6% to 35.1%. According to all of the studies, operative experience has been reduced. Knowledge learning had been switched to online platforms across 17 of the studies and 7 reported trainees had increased time to devote to educational/academic activities. All of the studies reporting on mental health report negative associations with increased stress, ranging from 54.9% to 91.6% of trainees. CONCLUSIONS: The impact of COVID-19 on surgical trainees has been experienced globally and across all specialities. Negative effects are not limited to operative and clinical experience, but also the mental health and wellbeing of trainees. Delivery of surgical training will need to move away from traditional models of learning to ensure trainees are competent and well supported.


Asunto(s)
COVID-19 , Humanos , SARS-CoV-2
5.
Br J Surg ; 106(8): 1019-1025, 2019 07.
Artículo en Inglés | MEDLINE | ID: mdl-31090925

RESUMEN

BACKGROUND: Over the past 10 years, the National Health Service in England has started to publish surgeon-specific outcomes publicly. The aim of this study was to investigate how this has affected training case exposure for surgeons in training. METHODS: Anonymized data were collected from the Intercollegiate Surgical Curriculum Programme database for operations in each specialty with published surgeon outcomes, involving surgical trainees on an approved training programme between 1 January 2011 and 31 December 2016. Trainee and supervisor involvement in operations before and after the start of publication of surgeon-specific outcomes were compared using mixed-effects models. RESULTS: A total of 163 076 recorded operative procedures were included. A statistically significant improvement in exposure to training procedures was observed for anterior resection of rectum, carotid endarterectomy, gastrectomy, meningioma excision, prostatectomy and thyroidectomy following the introduction of publication of surgeon outcomes. In coronary artery bypass grafting (CABG) and total hip replacement (THR), however, there was a reduction in involvement in training procedures. This was apparent for both trainee and supervisor involvement in CABG, and for trainee involvement in THR. CONCLUSION: Exposure to training procedures has improved rather than declined in the UK in the majority of surgical specialties, since the publication of surgeon-specific outcomes.


Asunto(s)
Cirugía General/educación , Cirujanos/estadística & datos numéricos , Femenino , Cirugía General/estadística & datos numéricos , Humanos , Masculino , Auditoría Médica/métodos , Auditoría Médica/estadística & datos numéricos , Medicina Estatal , Cirujanos/educación , Cirujanos/normas , Procedimientos Quirúrgicos Operativos/estadística & datos numéricos , Resultado del Tratamiento , Reino Unido
6.
Ann R Coll Surg Engl ; 101(4): 231-234, 2019 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-30773892

RESUMEN

INTRODUCTION: Healthcare professionals increasingly recognise how human factors (HF) can contribute to medical error. An understanding of HF is also important during other high stakes activities such as summative assessments or examinations. National organisations hosting such events need to be aware of potential fatigue, boredom and stress that can occur in interviewers during these often repetitive activities. METHODS: A previously validated questionnaire based around the well known HF analysis and classification system (HFACS) was used to evaluate four factors (care and support, asking questions about the role as an interviewer, working within the rules and boundaries, and stress and pressure) at the 2018 UK general and vascular surgery trainee national selection process. RESULTS: A total of 92 questionnaires were completed and analysed (48% response rate). After recoding for negative phrased questions, no significant differences were found between years of experience in the selection process and mean scores obtained for all four factor items. Interviewers had a positive experience during national selection with mean factor scores ranging from 3.84 to 3.98 (out of a maximum satisfaction score of 5). CONCLUSIONS: Organisations need to plan carefully and recognise the human element to ensure that their interviewers are cared for during any high stakes assessment such as national selection. Our work suggests that a positive assessor experience will further help contribute to a reliable and fair recruitment process.


Asunto(s)
Cirugía General , Selección de Personal , Especialidades Quirúrgicas , Femenino , Humanos , Entrevistas como Asunto , Masculino , Selección de Personal/métodos , Encuestas y Cuestionarios , Reino Unido , Procedimientos Quirúrgicos Vasculares
7.
Clin Microbiol Infect ; 25(8): 973-980, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-30685500

RESUMEN

OBJECTIVES: The aim was to investigate if offering symptomatic therapy (Uva-ursi or ibuprofen) alongside a delayed prescription would relieve symptoms and reduce the consumption of antibiotics for adult women presenting with acute uncomplicated urinary tract infection (UTI). METHODS: A 2 × 2 factorial placebo controlled randomized trial in primary care. The participants were 382 women aged 18-70 years with symptoms of dysuria, urgency, or frequency of urination and suspected by a clinician to have a lower UTI. The interventions were Uva-ursi extract and/or ibuprofen advice. All women were provided with a delayed or 'back-up' prescription for antibiotics. Missing data were imputed using multiple imputation methods (ISRCTN registry: ISRCTN43397016). RESULTS: An ITT analysis of mean score for frequency symptoms assessed on Days 2-4 found no evidence of a difference between Uva-ursi vs. placebo -0.06 (95% CI -0.33 to 0.21; p 0.661), nor ibuprofen vs. no ibuprofen advice -0.01 (95% CI -0.27 to 0.26; p 0.951). There was no evidence of a reduction in antibiotic consumption with Uva-ursi (39.9% vs. placebo 47.4%; logistic regression odds ratio (OR) 0.59 (95% CI 0.22-1.58; p 0.293) but there was a significant reduction for ibuprofen advice (34.9% vs. no advice 51.0%; OR 0.27 (95% CI 0.10 to 0.72; p 0.009). There were no safety concerns and no episodes of upper tract infection were recorded. CONCLUSIONS: We found no evidence of an effect of either intervention on the severity of frequency symptoms. There is evidence that advice to take ibuprofen will reduce antibiotic consumption without increasing complications. For every seven women given this advice, one less will use antibiotics.


Asunto(s)
Antiinflamatorios no Esteroideos/uso terapéutico , Arctostaphylos/química , Terapias Complementarias/métodos , Ibuprofeno/uso terapéutico , Extractos Vegetales/uso terapéutico , Infecciones Urinarias/tratamiento farmacológico , Enfermedad Aguda/terapia , Adolescente , Adulto , Anciano , Método Doble Ciego , Femenino , Humanos , Persona de Mediana Edad , Atención Primaria de Salud , Resultado del Tratamiento , Reino Unido , Adulto Joven
8.
Clin Oral Investig ; 23(8): 3307-3318, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-30498980

RESUMEN

OBJECTIVES: To describe changes in growth factor mediators in the gingival crevicular fluid (GCF) of patients with aggressive periodontitis (AgP) undergoing regenerative (GTR) and access flap (AF) surgery. MATERIALS AND METHODS: This was a 12-month, single-blind, split-mouth RCT involving 18 AgP patients with a bilateral intrabony defect which was treated with GTR or AF. GCF was collected prior to surgery and at subsequent follow-up visits from 3 days to 12 months post-operatively, and the levels of angiopoietin-1 (Ang-1), vascular-endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), bone morphogenetic protein-2 (BMP-2), osteoprotegerin (OPG), tissue inhibitor of metalloproteinase 1 (TIMP-1), keratinocyte growth factor (KGF) and platelet-derived growth factor-AB (PDGF-AB) were measured. At baseline, 6 and 12 months post-surgery, periodontal clinical parameters were evaluated. ANOVA was applied to test for differences in the amount of mediators (p < 0.05). RESULTS: Higher amounts of BMP-2 and OPG and a higher area under the curve (AUC) of KGF at the GTR versus AF sites were observed. The maximum change in the amount of KGF correlated significantly with periodontal clinical parameters at the GTR sites at 6 and 12 months. The AUC over 30 days of the amount of Ang-1, VEGF and KGF significantly correlated with periodontal clinical parameters at the AF sites at 6 months. CONCLUSIONS: AF and GTR differentially affected the profile of the growth mediators in GCF, and significant correlations between certain GCF mediators and periodontal clinical outcomes were identified. CLINICAL RELEVANCE: GCF components represent attractive prognostic markers for periodontal tissues undergoing repair or regeneration. However, the available evidence is not robust enough to suggest the use of a specific marker, and future adequately powered studies are warranted to identify the most relevant mediators that could be applied in clinical practice.


Asunto(s)
Periodontitis Agresiva , Líquido del Surco Gingival , Periodontitis Agresiva/metabolismo , Líquido del Surco Gingival/metabolismo , Humanos , Factor de Crecimiento Derivado de Plaquetas/metabolismo , Método Simple Ciego , Inhibidor Tisular de Metaloproteinasa-1/metabolismo , Factor A de Crecimiento Endotelial Vascular/metabolismo
9.
Ann R Coll Surg Engl ; : 1-7, 2018 Oct 05.
Artículo en Inglés | MEDLINE | ID: mdl-30286650

RESUMEN

INTRODUCTION: The Intercollegiate Membership of the Royal College of Surgeons (MRCS) is a mandatory examination to enter higher surgical specialty training in the UK. It is designed to help to ensure that successful candidates are competent to practice as higher surgical trainees. The annual review of competence progression (ARCP) assesses trainees' competence to progress to the next level of training and can be interpreted as a measure of 'on-the-job' performance. We investigated the relationship between MRCS performance and ARCP outcomes. MATERIALS AND METHODS: All UK medical graduates who passed MRCS (Parts A and B) from 2007 to 2016 were included. MRCS scores, attempts and sociodemographics for each candidate were crosslinked with ARCP outcomes (satisfactory, unsatisfactory and insufficient evidence). Multinomial logistic regression was used to identify potential independent predictors of ARCP outcomes. RESULTS: A total of 2570 trainees underwent 11,064 ARCPs; 1589 (61.8%) had only satisfactory outcomes recorded throughout training; 510 (19.9%) had at least one unsatisfactory outcome; and 471 (18.3%) supplied insufficient evidence. After adjusting for age, gender, first language and Part A performance, ethnicity (non-white vs white, OR 1.36, 95% CI 1.08 to 1.71), Part B passing score (OR 0.98, 95% CI 0.98 to 1.00) and number of attempts at Part B (two or more attempts vs one attempt, OR 1.50, 95% CI 1.16 to 1.94) were found to be independent predictors of an unsatisfactory ARCP outcome. CONCLUSIONS: This is the first study to identify predictors of ARCP outcomes during higher surgical specialty training in the UK and provides further evidence of the predictive validity of the MRCS examination.

10.
J Agric Food Chem ; 66(20): 5178-5189, 2018 May 23.
Artículo en Inglés | MEDLINE | ID: mdl-29732892

RESUMEN

WDHHAPQLR (RAP) is an antioxidative peptide derived from rapeseed protein. Although the health benefits from RAP, due to its antioxidant activities, have been determined by chemical methods, a systematic assessment regarding the absorption, metabolism, and antioxidation processes of RAP is still lacking attention. Hence, Caco-2 cell monolayer models and animal experiments were used to evaluate the absorption and bioavailability of RAP. As expected, RAP could be absorbed by intestinal epithelial cells, and the Papp was 0.82 ± 0.19 × 10-6 cm/s. Three main fragments, RAP, DHHAPQLR, and WDHHAP were transported by the paracellular pathway, and QLR was transported by PepT1. An important modified product of RAP (EGDHHAPQLR) was found to contribute to the elimination of intracellular reactive oxygen species. The absolute bioavailability of RAP was 3.56%, and three degradation products of RAP were also detected in rat serum. More importantly, RAP exerts its antioxidant activity by inhibiting the apoptosis of oxidative stress cells. RAP could downregulate the expression of Bax and caspase-3 and upregulate the expression of Bcl-2 in H2O2-induced HUVECs (human umbilical vein endothelial cells). In general, using in vitro and in vivo experimental models, the in vivo absorption and transformation processes of RAP and its antioxidative molecular mechanisms by inhibiting apoptosis of cells were revealed.


Asunto(s)
Apoptosis/efectos de los fármacos , Brassica rapa/química , Células Endoteliales de la Vena Umbilical Humana/citología , Células Endoteliales de la Vena Umbilical Humana/efectos de los fármacos , Estrés Oxidativo/efectos de los fármacos , Péptidos/metabolismo , Péptidos/farmacología , Proteínas de Plantas/química , Células Endoteliales de la Vena Umbilical Humana/metabolismo , Humanos , Péptidos/química , Proteínas de Plantas/metabolismo
12.
Br J Cancer ; 116(10): 1264-1270, 2017 May 09.
Artículo en Inglés | MEDLINE | ID: mdl-28376080

RESUMEN

BACKGROUND: SCALOP, a randomised, phase II trial, tested the activity and safety of gemcitabine (GEM)-based and capecitabine (CAP)-based chemoradiation (CRT) for locally advanced pancreatic cancer (LAPC). Here we present the long-term outcomes. METHODS: Eligibility: histologically proven LAPC ⩽7 cm. Following 12 weeks of induction GEMCAP chemotherapy (three cycles: GEM 1000 mg m-2 days 1, 8, 15; CAP 830 mg m-2 days 1-21 q28 days) patients with stable/responding disease, tumour ⩽6 cm, and WHO Performance Status 0-1 were randomised to receive one cycle GEMCAP followed by CAP (830 mg m-2 b.d. on weekdays only) or GEM (300 mg m-2 weekly) with radiation (50.4 Gy per 28 fractions). RESULTS: One-hundred fourteen patients (28 UK centres) were registered between 24 December 2009 and 25 October 2011, and 74 were randomised (CAP-RT=36; GEM-RT=38). At the time of this analysis, 105 of the 114 patients had died and the surviving 9 patients had been followed up for a median of 10.9 months (IQR: 2.9-18.7). Updated median OS was 17.6 months (95% CI: 14.6-22.7) in the CAP-CRT arm and 14.6 months (95% CI: 11.1-16.0) in the GEM-CRT arm (intention-to-treat adjusted hazard ratio (HR): 0.68 (95% CI: 0.38-1.21, P=0.185)); median progression-free survival (PFS) was 12.0 months (95% CI: 10.0-15.2) in the CAP-CRT arm and 10.4 months (95% CI: 8.8-12.7) in the GEM-CRT arm (intention-to-treat adjusted HR: 0.60 (95% CI: 0.32-1.14, P=0.120)). In baseline multivariable model, age ⩾65 years, better performance status, CA19.9<613 IU l-1, and shorter tumour diameter predicted improved OS. CAP-CRT, age ⩾65 years, better performance status, CA19.9 <46 IU ml-1 predicted improved OS and PFS in the pre-radiotherapy model. Nine-month PFS was highly predictive of OS. CONCLUSIONS: CAP-CRT remains the superior regimen. SCALOP showed that patients with CA19.9 <46 IU ml-1 after induction chemotherapy are more likely to benefit from CRT.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Antígeno CA-19-9/sangre , Quimioradioterapia , Neoplasias Pancreáticas/terapia , Anciano , Capecitabina/administración & dosificación , Desoxicitidina/administración & dosificación , Desoxicitidina/análogos & derivados , Supervivencia sin Enfermedad , Fraccionamiento de la Dosis de Radiación , Femenino , Estudios de Seguimiento , Humanos , Quimioterapia de Inducción/métodos , Masculino , Persona de Mediana Edad , Estadificación de Neoplasias , Neoplasias Pancreáticas/sangre , Neoplasias Pancreáticas/patología , Curva ROC , Índice de Severidad de la Enfermedad , Tasa de Supervivencia , Factores de Tiempo , Carga Tumoral , Gemcitabina
13.
Br J Cancer ; 116(6): 709-716, 2017 Mar 14.
Artículo en Inglés | MEDLINE | ID: mdl-28196063

RESUMEN

BACKGROUND: The SCOPE-1 study tested the role of adding cetuximab to conventional definitive chemoradiotherapy (dCRT), and demonstrated greater toxicity and worse survival outcomes. We present the long-term outcomes and patterns of recurrence. METHODS: SCOPE-1 was a phase II/III trial in which patients were randomised to cisplatin 60 mg m-2 (day 1) and capecitabine 625 mg m-2 bd (days 1-21) for four cycles +/- cetuximab 400 mg m-2 day 1 then by 250 mg m-2 weekly. Radiotherapy consisted of 50 Gy/25# given concurrently with cycles 3 and 4. Recruitment was between February 2008 and February 2012, when the IDMC recommended closure on the basis of futility. RESULTS: About 258 patients (dCRT=129; dCRT+cetuximab (dCRT+C)=129) were recruited from 36 centres. About 72.9% (n=188) had squamous cell histology. The median follow-up (IQR) was 46.2 (35.9-48.3) months for surviving patients. The median overall survival (OS; months; 95% CI) was 34.5 (24.7-42.3) in dCRT and 24.7 (18.6-31.3) in dCRT+C (hazard ratio (HR)=1.25, 95% CIs: 0.93-1.69, P=0.137). Median progression-free survival (PFS; months; 95% CI) was 24.1 (15.3-29.9) and 15.9 (10.7-20.8) months, respectively (HR=1.28, 95% CIs: 0.94-1.75; P=0.114). On multivariable analysis only earlier stage, full-dose RT, and higher cisplatin dose intensity were associated with improved OS. CONCLUSIONS: The mature analysis demonstrates that the dCRT regimen used in the study provided useful survival outcomes despite its use in patients who were largely unfit for surgery or who had inoperable disease. Given the competing risk of systemic and local failure, future studies should continue to focus on enhancing local control as well as optimising systemic therapy.


Asunto(s)
Adenocarcinoma/terapia , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Carcinoma de Células Escamosas/terapia , Quimioradioterapia , Neoplasias Esofágicas/terapia , Recurrencia Local de Neoplasia/terapia , Adenocarcinoma/patología , Anciano , Capecitabina/administración & dosificación , Carcinoma de Células Escamosas/patología , Cetuximab/administración & dosificación , Cisplatino/administración & dosificación , Neoplasias Esofágicas/patología , Femenino , Estudios de Seguimiento , Humanos , Masculino , Invasividad Neoplásica , Recurrencia Local de Neoplasia/patología , Estadificación de Neoplasias , Pronóstico , Tasa de Supervivencia
14.
BJS Open ; 1(3): 67-74, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-29951608

RESUMEN

BACKGROUND: The Intercollegiate Membership of the Royal College of Surgeons (MRCS) examination is undertaken by large numbers of trainees in the UK and internationally as a mandatory step within surgical training. Unlike some high-stakes medical examinations, the MRCS is yet to be validated. A quantitative study was undertaken to assess its predictive validity by investigating the relationship between MRCS (Parts A and B) and national selection interview scores for general and vascular surgery in the UK. METHODS: Pearson correlation coefficients were used to examine the linear relationship between each assessment, and linear regression analyses were employed to identify potential independent predictors of the national selection score. All UK medical graduates who attempted the interview in 2011-2015 were included. RESULTS: Some 84·4 per cent of the candidates (1231 of 1458) were matched with MRCS data. There was a significant positive correlation between the first attempt score at Part B of the MRCS examination and the national selection score (r = 0·38, P < 0·001). In multivariable analysis, 17 per cent of variance in the national selection first attempt score was explained by the Part B MRCS score and number of attempts (change in R 2 value of 0·10 and 0·07 respectively; P < 0·001). Candidates who required more than two attempts at Part B were predicted to score 8·1 per cent less than equally matched candidates who passed at their first attempt. CONCLUSION: This study supports validity of the MRCS examination, and indicates its predictive value regarding entry into specialist training.

15.
Br J Surg ; 104(1): 22-33, 2017 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-28000937

RESUMEN

BACKGROUND: General surgical training curricula around the world set defined operative numbers to be achieved before completion of training. However, there are few studies reporting total operative experience in training. This systematic review aimed to quantify the published global operative experience at completion of training in general surgery. METHODS: Electronic databases were searched systematically for articles in any language relating to operative experience in trainees completing postgraduate general surgical training. Two reviewers independently assessed citations for inclusion using agreed criteria. Studies were assessed for quantitative data in addition to study design and purpose. A meta-analysis was performed using a random-effects model of studies with appropriate data. RESULTS: The search resulted in 1979 titles for review. Of these, 24 studies were eligible for inclusion in the review and data from five studies were used in the meta-analysis. Studies with published data of operative experience at completion of surgical training originated from the USA (19), UK (2), the Netherlands (1), Spain (1) and Thailand (1). Mean total operative experience in training varied from 783 procedures in Thailand to 1915 in the UK. Meta-analysis produced a mean pooled estimate of 1366 (95 per cent c.i. 1026 to 1707) procedures per trainee at completion of training. There was marked heterogeneity between studies (I2 = 99·6 per cent). CONCLUSION: There is a lack of robust data describing the operative experiences of general surgical trainees outside the USA. The number of surgical procedures performed by general surgeons in training varies considerably across the world.


Asunto(s)
Cirugía General/educación , Procedimientos Quirúrgicos Operativos/educación , Procedimientos Quirúrgicos Operativos/estadística & datos numéricos , Curriculum , Humanos , Internado y Residencia
16.
Comput Biol Med ; 77: 274-84, 2016 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-27614697

RESUMEN

We discuss the solution of cornea curvature using a meshless method based on radial basis functions (RBFs). A full two-dimensional nonlinear thin membrane partial differential equation (PDE) model is introduced and solved using the multiquadratic (MQ) and inverse multiquadratic (IMQ) RBFs. This new approach does not rely on radial symmetry or other simplifying assumptions in respect of the cornea shape. It also provides an alternative to corneal topography modeling methods requiring accurate material parameter values, such as Young's modulus and Poisson ratio, that may not be available. The results show good agreement with published corneal data and allow back calculations for estimating certain physical properties of the cornea, such as tension and elasticity coefficient. All calculations and generation of graphics were performed using the R language programming environment [34] and RStudio, the integrated development environment (IDE) for R [36], both of which are open source and free to download. Part II [48] of this paper demonstrates how the method has been used to provide a very accurate fit to a corneal measured data set.


Asunto(s)
Córnea/diagnóstico por imagen , Topografía de la Córnea/métodos , Procesamiento de Imagen Asistido por Computador/métodos , Fenómenos Biomecánicos , Elasticidad , Humanos
17.
Comput Biol Med ; 77: 285-96, 2016 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-27570056

RESUMEN

In part I we discussed the solution of corneal curvature using a 2D meshless method based on radial basis functions (RBFs). In Part II we use these methods to fit a full nonlinear thin membrane model to a measured data-set in order to generate a topological mathematical description of the cornea. In addition, we show how these results can lead to estimations for corneal radius of curvature and certain physical properties of the cornea; namely, tension and elasticity coefficient. Again all calculations and graphics generation were performed using the R language programming environment. The model describes corneal topology extremely well, and the estimated properties fall well within the expected range of values. The method is straight forward to implement and offers scope for further analysis using more detailed 3D models that include corneal thickness.


Asunto(s)
Córnea/diagnóstico por imagen , Córnea/fisiología , Topografía de la Córnea/métodos , Adulto , Elasticidad , Humanos , Modelos Biológicos
18.
Ultrason Sonochem ; 31: 267-75, 2016 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-26964949

RESUMEN

The effects of alternate dual-frequency ultrasound (ADFU) pretreatment on the degree of hydrolysis (DH) of wheat gluten (WG) and angiotensin I-converting enzyme (ACE) inhibitory activity were investigated in this research. The surface topography, nano-mechanics and secondary structure of WG were also determined using atomic force microscope (AFM) and circular dichroism (CD). The correlations of ACE inhibitory activity and DH with surface topography, nano-mechanics and secondary structure of WG were determined using Pearson's correlation analysis. The results showed that with an increase in either pretreatment duration or power, the ACE inhibitory activity of the hydrolysate also increases, reaching maximum at 10 min and 150 W/L, respectively, and then decreases thereafter. Similarly, AFM analysis showed that as the pretreatment duration or power increases, the surface roughness also increase and again a decrease occurs thereafter. As the pretreatment duration or power increased, the Young's modulus and adhesion of WG also increased and then declined. Young's modulus and adhesions average values were compared with ACE inhibitory activity reversely. The result of the CD spectra analysis exhibited losses in the relative percentage of α-helix of WG. Pearson's correlation analysis showed that the average values of Young's modulus and the relative percentage of α-helix correlated with ACE inhibitory activity of the hydrolysates linearly and significantly (P<0.05); the relative percentage of ß-sheet correlated linearly with DH of WG significantly (P<0.05). In conclusion, ADFU pretreatment is an efficient method in proteolysis due to its physical and chemical effect on the Young's modulus, α-helix and ß-sheet of WG.


Asunto(s)
Acetilcolinesterasa/química , Glútenes/química , Triticum/química , Ultrasonido , Dicroismo Circular , Microscopía de Fuerza Atómica , Estructura Secundaria de Proteína , Proteolisis , Propiedades de Superficie
19.
Br J Cancer ; 113(4): 603-10, 2015 Aug 11.
Artículo en Inglés | MEDLINE | ID: mdl-26203761

RESUMEN

BACKGROUND: Limited data describe patient-reported outcomes (PROs) of localised oesophageal cancer treated with definitive chemoradiotherapy(CRT). The phase 2/3 SCOPE-1 trial assessed the effectiveness of CRT±cetuximab. The trial for the first time provided an opportunity to describe PROs from a multi-centre group of patients treated with CRT that are presented here. METHODS: Patients undergoing CRT±cetuximab within the SCOPE-1 trial (258 patients from 36 UK centres) completed generic-, disease- and treatment-specific health-related quality of life (HRQL) questionnaires (EORTC QLQ-C30, QLQ-OES18, Dermatology Life-Quality Index (DLQI)) at baseline and at 7, 13, 24, 52 and 104 weeks. Mean EORTC functional scale scores (>15 point change significant), DLQI scores (>4 point change significant) and proportions of patients (>15% significant) with 'minimal' or 'severe' symptoms are presented. RESULTS: Questionnaire response rates were good. At baseline, EORTC functional scores were high (>75%) and few symptoms were reported except for severe problems with fatigue, insomnia and eating-related symptoms (e.g., appetite loss, dysphagia, dry mouth) in both groups(>15%). Functional aspects of health deteriorated and symptoms increased with treatment and by week 13 global quality of life, physical, role and social function significantly deteriorated and more problems with fatigue, dyspnoea, appetite loss and trouble with taste were reported. Recovery occurred by 6 months (except severe fatigue and insomnia in >15% of patients) and maintained at follow-up with no differences between groups. CONCLUSIONS: CRT for localised oesophageal cancer has a significant detrimental impact on many aspects of HRQL; however, recovery is achieved by 6 months and maintained with the exception of persisting problems with severe fatigue and insomnia. The data suggest that the HRQL recovery after definitive CRT is quicker, and there is little lasting deficit compared with treatment including surgery. These data need to be compared with HRQL data from studies evaluating treatments including surgery for oesophageal cancer.


Asunto(s)
Neoplasias Esofágicas/terapia , Anticuerpos Monoclonales Humanizados/uso terapéutico , Cetuximab , Quimioradioterapia/métodos , Humanos , Evaluación del Resultado de la Atención al Paciente , Calidad de Vida , Encuestas y Cuestionarios
20.
Br Dent J ; 218(3): 92-3, 2015 Feb 16.
Artículo en Inglés | MEDLINE | ID: mdl-25686412
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