ABSTRACT
OBJECTIVE: Tongue base mucosectomy identified cancer in 78 per cent of cancers of unknown primary in a recent meta-analysis. The carbon dioxide laser is an alternative technique if there is no access to a robot. This study aimed to describe the steps for undertaking tongue base mucosectomy using the carbon dioxide laser and its diagnostic utility in cancers of unknown primary. METHOD: This was a prospective feasibility study utilising carbon dioxide laser for tongue base mucosectomy in cancers of unknown primary. Data collected included demographic data and p16 status. RESULTS: There were 14 cancers of unknown primary with 86 per cent p16 positivity on immunohistochemistry. Laser tongue base mucosectomy alone identified the cancer primary in 7 of 12 (58 per cent) cancers of unknown primary among p16 positive tumours and 0 of 2 (0 per cent) among p16 negative tumours. Combining bilateral tonsillectomy with laser tongue base mucosectomy resulted in identification of the primary cancer in 8 of 12 (67 per cent) p16 positive tumours. CONCLUSION: In centres without a robot, tongue base mucosectomy using the carbon dioxide laser is a viable alternative, especially in combination with bilateral tonsillectomy in p16 positive cases.
Subject(s)
Head and Neck Neoplasms , Laryngeal Neoplasms , Neoplasms, Unknown Primary , Oropharyngeal Neoplasms , Tongue Neoplasms , Humans , Head and Neck Neoplasms/diagnosis , Head and Neck Neoplasms/surgery , Head and Neck Neoplasms/pathology , Neoplasms, Unknown Primary/diagnosis , Neoplasms, Unknown Primary/surgery , Neoplasms, Unknown Primary/pathology , Prospective Studies , Tongue/surgery , Tongue/pathology , Tongue Neoplasms/diagnosis , Tongue Neoplasms/surgery , Oropharyngeal Neoplasms/pathology , Laryngeal Neoplasms/pathology , LasersABSTRACT
BACKGROUND: In peritoneal dialysis-related peritonitis (peritonitis), delayed antibiotic therapy is associated with adverse outcomes. Identifying barriers to timely treatment may improve outcomes. AIM: To determine the impact of radiological investigations on treatment delay and predictors of hospitalisation and length of stay (LOS). METHODS: Retrospective review of patients with presumed peritonitis in Western Australia. RESULTS: In 153 episodes of peritonitis, 79 (51.6%) resulted in admission with a median LOS of 3 days (Q1, Q3: 1, 6). In a multivariable model, significant predictors of admission were abnormal exit-site (odds ration (OR) 5.7; 95% confidence interval (CI): 1.4, 23.6; p = 0.02), failure to detect a cloudy bag (OR 11.9; 95%CI: 3.2, 44.7; p < 0.001), female sex (OR 3.3; 95% CI: 1.4, 9.7; p = 0.027), radiological imaging within 24 h (OR 8.8; 95% CI: 2.2, 34.8; p = 0.002) and contact with ambulant care facility (OR 0.32, 95% CI: 0.11, 0.98; p = 0.04). Imaging within 24 h of presentation occurred in 41 (27%) episodes of peritonitis, mostly plain X-rays (91%), of which 83% were clinically irrelevant. Imaging performed within 24 h of presentation increased the median time to antibiotic treatment (2.9 h (Q1, Q3: 1.6, 6.4) vs 2.0 h (Q1, Q3: 1, 3.8; p = 0.046)). Imaging performed prior to administering antibiotics significantly increased the median time to treatment (4.7 h (Q1, Q3: 2.9, 25) vs 1.5 h (Q1, Q3: 0.75, 2.5; p < 0.001)) in those where imaging followed antibiotic treatment. CONCLUSIONS: Half of all presentations with peritonitis result in hospital admission. Radiological imaging was associated with an increased risk of hospitalisation, potentially contributes to treatment delay, and was mostly clinically unnecessary. When required, imaging should follow antibiotic therapy.
Subject(s)
Peritoneal Dialysis , Peritonitis , Anti-Bacterial Agents/therapeutic use , Female , Hospitalization , Humans , Peritoneal Dialysis/adverse effects , Peritonitis/diagnostic imaging , Peritonitis/drug therapy , Retrospective Studies , Time-to-TreatmentABSTRACT
BACKGROUND: Advances in endoscopic technology have allowed transnasal oesophagoscopy to be used for a variety of diagnostic and therapeutic procedures. METHOD: A review of the literature was carried out to look into the extended role of transnasal oesophagoscopy within otolaryngology, using the Embase, Cinahl and Medline databases. RESULTS: There were 16 studies showing that transnasal oesophagoscopy is safe and cost effective and can be used for removal of foreign bodies, tracheoesophageal puncture, laser laryngeal surgery and balloon dilatation. CONCLUSION: This study presents a summary of the literature showing that transnasal oesophagoscopy can be used as a safe and cost-effective alternative or adjunct to traditional rigid endoscopes for therapeutic procedures.
Subject(s)
Esophagoscopy/methods , Nose/surgery , Otolaryngology/standards , Cost-Benefit Analysis , Dilatation/instrumentation , Esophagoscopy/adverse effects , Esophagus/surgery , Foreign Bodies/surgery , Head and Neck Neoplasms/surgery , Humans , Larynx/surgery , Laser Therapy/instrumentation , Otolaryngology/statistics & numerical data , Punctures , Safety , Trachea/surgeryABSTRACT
AIM: To review the ultrasound (US) patterns of pure ductal carcinoma in situ (DCIS) using a non-mass-like (NML) versus mass-like (ML) classification and to investigate histopathological associations. MATERIALS AND METHODS: The present study was a retrospective analysis of sonographically evident pure DCIS lesions detected in a mammographic (MG) screening programme over a 7-year period from 2008. All lesions had undergone US-guided 14 G core biopsies with no upgrades to invasive disease on surgical histopathology. Lesions that were three-dimensional with convex margins were classified as ML and all others as NML. ML lesions were subdivided into solid, cystic, or mixed, and NML lesions into ductal and non-ductal. Imaging and pathological characteristics of NML versus ML lesions were investigated using logistic regression. RESULTS: There were 78 lesions in 75 participants. NML lesions accounted for 45 (58%) lesions, comprising 27 (60%) ductal and 18 (40%) non-ductal subtypes. There were 33 (42%) ML lesions; the largest subgroup being solid (n=21, 64%). Significant associations between lesion type and lesion size on US (<15 versus ≥15 mm), presence of US and mammographic calcification and posterior shadowing on sonography were identified. NML lesions had fivefold higher odds (OR=5.41 95% confidence interval [CI]: 2.03, 14.39, p=0.001) to be high grade and sevenfold higher odds (OR=7 95% CI: 1.75, 27.99, p=0.006) to have comedo necrosis on histopathology. CONCLUSION: DCIS lesions can be successfully classified using ML and NML lesion descriptors and NML morphology on US is associated with histological features of "high-risk" DCIS.
Subject(s)
Breast Neoplasms/diagnostic imaging , Carcinoma, Intraductal, Noninfiltrating/diagnostic imaging , Adult , Aged , Aged, 80 and over , Breast/diagnostic imaging , Breast/pathology , Breast Neoplasms/pathology , Carcinoma, Intraductal, Noninfiltrating/pathology , Female , Humans , Middle Aged , Retrospective Studies , UltrasonographyABSTRACT
There is an increasing incidence of overweight/obesity and mental health disorders in young adults and the two conditions often coexist. We aimed to investigate the influence of antenatal and postnatal factors that may underlie this association with a focus on maternal prenatal smoking, socio-economic status and gender. Data from the Western Australian Pregnancy Cohort (Raine) Study (women enrolled 1989-1991) including 1056 offspring aged 20 years (cohort recalled 2010-2012) were analyzed (2015-2016) using multivariable models for associations between offspring depression scores (DASS-21 Depression-scale) and body mass index (BMI), adjusting for pregnancy and early life factors and offspring behaviours. There was a significant positive relationship between offspring depression-score and BMI independent of gender and other psychosocial covariates. There was a significant interaction between maternal prenatal smoking and depression-score (interaction coefficient=0.096; 95% CI: 0.006, 0.19, P=0.037), indicating the relationship between depression-score and BMI differed according to maternal prenatal smoking status. In offspring of maternal prenatal smokers, a positive association between BMI and depression-score (coefficient=0.133; 95% CI: 0.05, 0.21, P=0.001) equated to 1.1 kg/m2 increase in BMI for every 1standard deviation (8 units) increase in depression-score. Substituting low family income during pregnancy for maternal prenatal smoking in the interaction (interaction coefficient=0.091; 95% CI: 0.01, 0.17, P=0.027) showed a positive association between BMI and depression score only among offspring of mothers with a low family income during pregnancy (coefficient=0.118; 95% CI: 0.06, 0.18, P<0.001). There were no significant effects of gender on these associations. Whilst further studies are needed to determine whether these associations are supported in other populations, they suggest potentially important maternal behavioural and socio-economic factors that identify individuals vulnerable to the coexistence of obesity and depression in early adulthood.
Subject(s)
Depression/epidemiology , Obesity/epidemiology , Poverty , Prenatal Exposure Delayed Effects , Smoking/adverse effects , Socioeconomic Factors , Adiposity , Adult , Australia , Body Mass Index , Female , Humans , Longitudinal Studies , Multivariate Analysis , PregnancyABSTRACT
BACKGROUND: Resolution of inflammation is an active process involving specialised pro-resolving mediators (SPMs) generated from the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Omega-3 fatty acid supplementation during infancy may provide an intervention strategy to modify SPMs and reduce oxidative stress. This study evaluates the effect of omega-3 fatty acid supplementation in infancy on SPMs and F2-isoprostanes from 6 months to 5 years of age. METHODS: In a double-blind, placebo-controlled, parallel-group study design, 420 infants were randomized to a daily supplement of omega-3 fatty acids (280mg DHA and 110mg EPA) or olive oil (control), from birth to age 6 months. Blood was collected at birth (cord blood), 6 months, 12 months and 5 years. Plasma SPMs included 18-HEPE, E-series resolvins, 17-HDHA, D-series resolvins, 14-HDHA, 10S,17S-DiHDoHE, MaR1 and PD1. F2-isoprostanes were measured in plasma and urine, as markers of oxidative stress in vivo. RESULTS: The change in the concentration of 18-HEPE from birth to 6 months was greater in the omega-3 fatty acid group (Ptimepoint*group=0.04) with levels at 6 months significantly higher than controls (P=0.02). Other SPMs were not different between the groups at any time point. Plasma 18-HEPE concentration were associated with erythrocyte EPA concentrations after age and group adjustments (P<0.001), but not with allergic outcomes at 12 months. There were no between-group differences in plasma and urinary F2-isoprostanes at any time point. CONCLUSION: Omega-3 fatty acid supplementation from birth to 6 months of age increased SPM at 6 months but the effects were not sustained after supplementation ceased. Given that 18-HEPE is a biologically active metabolite, future studies should examine how the increase in 18-HEPE relates to potential health benefits of omega-3 fatty acid supplementation in infancy.
Subject(s)
Biomarkers/blood , Fatty Acids, Omega-3/administration & dosage , Hydroxyeicosatetraenoic Acids/blood , Inflammation/blood , Child, Preschool , Dietary Supplements/adverse effects , Docosahexaenoic Acids/administration & dosage , Docosahexaenoic Acids/blood , Eicosapentaenoic Acid/administration & dosage , Eicosapentaenoic Acid/blood , Fatty Acids, Omega-3/adverse effects , Fatty Acids, Omega-3/blood , Female , Humans , Infant , Inflammation/physiopathology , Male , Olive Oil/administration & dosage , Oxidative Stress/drug effects , PregnancyABSTRACT
Long-term non-invasive ventilation (NIV) was introduced in the 1980s, initially mainly for patients with poliomyelitis, muscular dystrophy (MD) or scoliosis. The obesity-hypoventilation syndrome has since become the commonest reason for referral to most centres providing home-NIV. Patients with MD are numerically a much smaller part of the workload, but as their disease progresses the need for ventilatory support changes and they require regular comprehensive assessment of their condition. We have examined the trend in MD use of home-NIV in our unit over the last 25 years. The number of new referrals appears to be stabilizing at around 20-25 over a 5-year period, equivalent to approximately 0.5 per 100,000 of population per year. The mean age at commencement of home-NIV is now 37.5 years, with 5-year survival rates of 70-75%. Ten-year survival rates are just over 40%. The distance of usual place of residence from our unit is fairly stable, currently at a mean of 27 km. Excellent survival rates mean that patients with MD, while numerically small, are likely to remain an important part of the workload of centres providing home-NIV. Our data should prove useful in the planning of future services for this group of patients.
Subject(s)
Muscular Dystrophies/rehabilitation , Noninvasive Ventilation/trends , Referral and Consultation/trends , Respiratory Insufficiency/therapy , Adult , Disease Progression , Female , Humans , Male , Muscular Dystrophies/complications , Muscular Dystrophies/mortality , Respiratory Insufficiency/etiology , Respiratory Therapy , Survival RateABSTRACT
BACKGROUND: The mechanisms involved in the amplification of the mast cell response during anaphylaxis are unclear. Mouse models of anaphylaxis demonstrate the critical involvement of neutrophils. These innate immune cells are highly abundant in peripheral blood and can be rapidly activated to trigger both local and systemic inflammation. OBJECTIVE: To investigate neutrophil activation in peripheral blood during acute human anaphylaxis. METHODS: Patients presenting to the emergency department with anaphylaxis underwent blood sampling upon enrolment and at up to three subsequent time-points. Traditional anaphylaxis biomarkers, histamine and mast cell tryptase, were measured by ELISA and ImmunoCAP, respectively. Plasma myeloperoxidase concentrations were measured by ELISA, serum soluble CD62L concentrations by cytometric bead array, and both compared to healthy controls. RESULTS: In 72 patients, 37 (51%) had severe anaphylaxis, 33 (60%) were histamine positive, and 47 (70%) were mast cell tryptase positive. At enrolment, myeloperoxidase concentrations were 2.9- (95% CI: 1.3, 6.5) and 5.0- (95% CI: 2.4, 10.5) fold higher in moderate and severe patients, respectively, compared with healthy controls, and remained stable over the first 5 h following symptom onset. At enrolment, soluble CD62L was 29% (95% CI: 19, 38) and 31% (95% CI: 22, 40) lower in moderate and severe patients, respectively, than healthy controls, and was stable over the first 5 h. There were no associations between myeloperoxidase or soluble CD62L concentrations and either histamine or mast cell tryptase concentrations. CONCLUSIONS AND CLINICAL RELEVANCE: These results provide compelling evidence for the involvement of neutrophils during acute human anaphylaxis, suggesting they are activated early in the reaction, regardless of mast cell activation. This important finding increases our understanding of the basic mechanisms of anaphylaxis, a necessary precursor to improving treatment and prevention.
Subject(s)
Anaphylaxis/immunology , Anaphylaxis/metabolism , Neutrophil Activation/immunology , Neutrophils/immunology , Neutrophils/metabolism , Adult , Allergens/immunology , Anaphylaxis/diagnosis , Anaphylaxis/genetics , Biomarkers , Female , Histamine Release , Humans , L-Selectin/blood , Male , Mast Cells/immunology , Mast Cells/metabolism , Middle Aged , Neutrophil Activation/genetics , Peroxidase/genetics , Peroxidase/metabolism , Tryptases/blood , Young AdultABSTRACT
During non-invasive ventilation (NIV), tidal volume ( Vt) will depend upon the difference between inspiratory and expiratory positive airway pressure (IPAP and EPAP, respectively), provided the respiratory muscles are relaxed and the lungs and chest wall therefore move along their passive pressure-volume curves. To test this hypothesis, we studied the effect of increasing EPAP during pressure-controlled modes of NIV in 30 long-term ventilator users (10 each with scoliosis, obesity hypoventilation or neuromuscular disorders). While maintaining the same IPAP, addition of 5 cmH2O of EPAP reduced mean Vt by 167 ml; 10 cmH2O reduced Vt by 367 ml. This pattern was seen in all three patient groups. EPAP has several potential advantages, for example maintaining upper airway patency, preventing basal atelectasis and facilitating triggering. EPAP does, however, appear to reduce Vt. Decreasing EPAP is an alternative to increasing IPAP if measurements of gas exchange during NIV indicate that ventilation is inadequate.
Subject(s)
Intermittent Positive-Pressure Ventilation/methods , Noninvasive Ventilation/methods , Pressure , Respiratory Insufficiency/physiopathology , Respiratory Insufficiency/therapy , Humans , Neuromuscular Diseases/complications , Neuromuscular Diseases/physiopathology , Obesity Hypoventilation Syndrome/complications , Obesity Hypoventilation Syndrome/physiopathology , Random Allocation , Respiratory Insufficiency/etiology , Scoliosis/complications , Scoliosis/physiopathology , Tidal VolumeABSTRACT
BACKGROUND: Oxidative stress and nutritional deficiency may influence the excessive shortening of the telomeric ends of chromosomes. It is known that stress exposure in intrauterine life can produce variations in telomere length (TL), thereby potentially setting up a long-term trajectory for disease susceptibility. OBJECTIVE: To assess the effect of omega-3 long chain polyunsaturated fatty acid (n-3 LCPUFA) supplementation during pregnancy on telomere length and oxidative stress in offspring at birth and 12 years of age (12y). DESIGN: In a double-blind, placebo-controlled, parallel-group study, 98 pregnant atopic women were randomised to 4g/day of n-3 LCPUFA or control (olive oil [OO]), from 20 weeks gestation until delivery. Telomere length as a marker of cell senescence and plasma and urinary F2-isoprostanes as a marker of oxidative stress were measured in the offspring at birth and 12y. RESULTS: Maternal n-3 LCPUFA supplementation did not influence offspring telomere length at birth or at 12y with no changes over time. Telomere length was not associated with F2-isoprostanes or erythrocyte total n-3 fatty acids. Supplementation significantly reduced cord plasma F2-isoprostanes (P<0.001), with a difference in the change over time between groups (P=0.05). However, the differences were no longer apparent at 12y. Between-group differences for urinary F2-isoprostanes at birth and at 12y were non-significant with no changes over time. CONCLUSIONS: This study does not support the hypothesis that n-3 LCPUFA during pregnancy provides sustained effects on postnatal oxidative stress and telomere length as observed in the offspring.
Subject(s)
F2-Isoprostanes/blood , F2-Isoprostanes/urine , Fatty Acids, Omega-3/administration & dosage , Telomere/drug effects , Child , Dietary Supplements , Double-Blind Method , Erythrocytes/chemistry , Fatty Acids, Omega-3/pharmacology , Female , Humans , Oxidative Stress/drug effects , Pregnancy , Prenatal CareABSTRACT
In 40% of cases of classical Hodgkin lymphoma (cHL), Epstein-Barr virus (EBV) latency-II antigens [EBV nuclear antigen 1 (EBNA1)/latent membrane protein (LMP)1/LMP2A] are present (EBV(+) cHL) in the malignant cells and antigen presentation is intact. Previous studies have shown consistently that HLA-A*02 is protective in EBV(+) cHL, yet its role in disease pathogenesis is unknown. To explore the basis for this observation, gene expression was assessed in 33 cHL nodes. Interestingly, CD8 and LMP2A expression were correlated strongly and, for a given LMP2A level, CD8 was elevated markedly in HLA-A*02(-) versus HLA-A*02(+) EBV(+) cHL patients, suggesting that LMP2A-specific CD8(+) T cell anti-tumoral immunity may be relatively ineffective in HLA-A*02(-) EBV(+) cHL. To ascertain the impact of HLA class I on EBV latency antigen-specific immunodominance, we used a stepwise functional T cell approach. In newly diagnosed EBV(+) cHL, the magnitude of ex-vivo LMP1/2A-specific CD8(+) T cell responses was elevated in HLA-A*02(+) patients. Furthermore, in a controlled in-vitro assay, LMP2A-specific CD8(+) T cells from healthy HLA-A*02 heterozygotes expanded to a greater extent with HLA-A*02-restricted compared to non-HLA-A*02-restricted cell lines. In an extensive analysis of HLA class I-restricted immunity, immunodominant EBNA3A/3B/3C-specific CD8(+) T cell responses were stimulated by numerous HLA class I molecules, whereas the subdominant LMP1/2A-specific responses were confined largely to HLA-A*02. Our results demonstrate that HLA-A*02 mediates a modest, but none the less stronger, EBV-specific CD8(+) T cell response than non-HLA-A*02 alleles, an effect confined to EBV latency-II antigens. Thus, the protective effect of HLA-A*02 against EBV(+) cHL is not a surrogate association, but reflects the impact of HLA class I on EBV latency-II antigen-specific CD8(+) T cell hierarchies.
Subject(s)
CD8-Positive T-Lymphocytes/immunology , HLA-A2 Antigen/immunology , Herpesvirus 4, Human/immunology , Herpesvirus 4, Human/isolation & purification , Hodgkin Disease/immunology , Hodgkin Disease/virology , Viral Matrix Proteins/immunology , Adolescent , Adult , Aged , Antigen Presentation , CD8-Positive T-Lymphocytes/virology , Female , Genes, MHC Class I , HLA-A2 Antigen/genetics , Herpesvirus 4, Human/genetics , Hodgkin Disease/genetics , Hodgkin Disease/physiopathology , Humans , Male , Middle Aged , Viral Matrix Proteins/genetics , Young AdultABSTRACT
BACKGROUND: Despite supernumerary registrars (SNRs) being hosted in South African (SA) training programmes, there are no reports of their experience. OBJECTIVES: To evaluate the experience of SNRs at the University of Cape Town, SA, and the experience of SNRs from the perspective of SA registrars (SARs). METHODS: SNRs and SARs completed an online survey in 2012. RESULTS: Seventy-three registrars responded; 42 were SARs and 31 were SNRs. Of the SNRs 47.8% were self-funded, 17.4% were funded through private organisations, and 34.8% were funded by governments. Average annual income was ZAR102 349 (range ZAR680 - 460 000). Funding was considered insufficient by 61.0%. Eighty-seven percent intended to return to their home countries. Personal sacrifices were deemed worthwhile from academic (81.8%) and social (54.5%) perspectives, but not financially (33.3%). Only a small majority were satisfied with the orientation provided and with assimilation into their departments. Almost half experienced challenges relating to cultural and social integration. Almost all SARs supported having SNRs. SNRs reported xenophobia from patients (23.8%) and colleagues (47.8%), and felt disadvantaged in terms of learning opportunities, academic support and on-call allocations. CONCLUSIONS: SNRs are fee-paying students and should enjoy academic and teaching support equal to that received by SARs. Both the university and the teaching hospitals must take steps to improve the integration of SNRs and ensure that they receive equal access to academic support and clinical teaching, and also need to take an interest in their financial wellbeing. Of particular concern are perceptions of xenophobia from SA medical colleagues.
ABSTRACT
AIM: To evaluate the accuracy of axillary ultrasound, compared with published literature, identify women at low risk for lymph node (LN) involvement, and to determine which clinical, pathological, and imaging findings best predict LN involvement. MATERIAL AND METHODS: From June 2010 to April 2012, 288 women with breast lesions that were suspicious of malignancy (category 4) or malignant (category 5) underwent axillary ultrasound examination. A 3 mm LN cortical thickness was used as the threshold to prompt fine-needle aspiration biopsy (FNAB) of the LN. Data were gathered regarding size, site, and grade of the index breast lesion and cortical thickness of the LN. RESULTS: Using a cut-off point of <3 mm versus ≥3 mm, abnormal cortical thickness had a sensitivity and specificity of 56.3% and 86.7%, respectively. Breast cancer size was significantly associated with the odds of LN metastasis (p<0.001). There were 69 patients with breast cancers of ≤10 mm and 18% had positive axillary LNs. A much higher rate of malignancy was observed in breast cancers located in multiple sites and in a central location. CONCLUSION: The likelihood of axillary LN metastasis increases with cortical thickness ≥3 mm and this concurs with the literature. A low-risk group of women was identified with screen-detected, low-grade small cancers with LNs with a cortical thickness of <3 mm. Additional features other than cortical thickness >3 mm (such as shape [rounding], echogenicity [markedly hypo-echoic cortex], and morphology [hilar compressional displacement, loss of echogenic outer capsule and angular margins]) should be used to indicate FNAB in patients with a palpable lump, multiple or central cancers, and cancers >20 mm.
Subject(s)
Axilla/diagnostic imaging , Breast Neoplasms/pathology , Lymphatic Metastasis/diagnostic imaging , Adult , Aged , Aged, 80 and over , Biopsy, Fine-Needle , Carcinoma in Situ/pathology , Female , Humans , Lymphatic Metastasis/pathology , Middle Aged , Neoplasm Invasiveness/pathology , Predictive Value of Tests , Retrospective Studies , Sensitivity and Specificity , UltrasonographyABSTRACT
BACKGROUND: Among the environmental factors associated with multiple sclerosis (MS) causation, some of the strongest associations are with Epstein-Barr virus (EBV), and to a lesser extent human herpesvirus 6 (HHV6). Associations with clinical course are less conclusive, however. METHODS: We evaluated serum anti-EBV-EA-R IgG and anti-HHV6 IgM, and EBV and HHV6 viral load (VL) for their associations with relapse, disability, and progression in disability in a prospective cohort of 198 participants with clinically definite MS. RESULTS: Anti-EBV-EA-R IgG was detected in 81.8% of cases at study entry, and titers remained essentially unchanged during the study. Anti-HHV6 IgM was detected in only one participant, and EBV-VL (29%) and HHV6-VL (1.8%) were detected in a minority of samples, and where detected levels were low. Our previously demonstrated association between anti-HHV6 IgG and relapse hazard was not affected by adjustment for parameters of reactivation. We found no evidence that any of the viral markers were associated with disability or progression in disability. In relation to relapse, only EBV-VL was positively associated, although this was strongly influenced by a single individual. CONCLUSION: Using a prospective cohort design, we found no convincing evidence that reactivation parameters of EBV or HHV6 were associated with subsequent MS relapse hazard or progression in disability, confirming previous findings, and indicating that herpesvirus reactivation is not an important driver of relapse or disability in this established MS population.
Subject(s)
Epstein-Barr Virus Infections/complications , Herpesvirus 4, Human/physiology , Herpesvirus 6, Human/physiology , Multiple Sclerosis/virology , Roseolovirus Infections/complications , Adult , Aged , Antibodies, Viral/blood , Cohort Studies , Disease Progression , Female , Humans , Immunoglobulin G/blood , Male , Middle Aged , Multiple Sclerosis/immunology , Prospective Studies , Recurrence , Viral Load , Virus Activation/physiology , Young AdultABSTRACT
Shear horizontal (SH) ultrasound guided waves are being used in an increasing number of non-destructive testing (NDT) applications. One advantage SH waves have over some wave types, is their ability to propagate around curved surfaces with little energy loss; to understand the geometries around which they could propagate, the wave reflection must be quantified. A 0.83mm thick aluminium sheet was placed in a bending machine, and a shallow bend was introduced. Periodically-poled magnet (PPM) electromagnetic acoustic transducers (EMATs), for emission and reception of SH waves, were placed on the same side of the bend, so that reflected waves were received. Additional bending of the sheet demonstrated a clear relationship between bend angles and the reflected signal. Models suggest that the reflection is a linear superposition of the reflections from each bend segment, such that sharp turns lead to a larger peak-to-peak amplitude, in part due to increased phase coherence.
ABSTRACT
High-throughput T cell receptor sequencing on sequentially banked blood samples from healthy individuals has shown that high-frequency clonotypes can remain relatively stable for up to 18 years, with minimal inflation, deflation, or turnover. These populations included T cell expansions specific for Epstein-Barr virus. Thus, in spite of exposure to a barrage of microorganisms over the course of life, the dominant clonotypes in the mature peripheral T cell repertoire can alter surprisingly little.
Subject(s)
Genetic Variation , Receptors, Antigen, T-Cell/genetics , Receptors, Virus/genetics , T-Lymphocytes/cytology , Adult , Aged , Amino Acid Sequence , Blood Donors , Humans , Male , Middle Aged , Molecular Sequence Data , Sequence Analysis, DNA , T-Lymphocytes/physiology , Time FactorsSubject(s)
Clinical Competence/standards , Mentors/classification , Mentors/statistics & numerical data , Otorhinolaryngologic Surgical Procedures/education , Otorhinolaryngologic Surgical Procedures/standards , Certification/standards , Electronic Health Records , England , Observer Variation , Operating Room Information Systems , Reproducibility of ResultsABSTRACT
OBJECTIVE: To establish whether there is an association between academic output and mortality rates for National Health Service (NHS) trusts. METHODS: Hospital standardized mortality ratios were obtained from Dr Foster hospital report cards. The Medline database of biomedical citations was queried to establish the number of citations credited to each NHS trust and constituent hospitals from 2006 to 2010. Admissions totals for NHS trusts for 2009-2010 were obtained from Hospital Episode Statistics Online. The number of citations per admission was calculated and used as an indicator of academic output as this reflects the workload of the trust. RESULTS: Spearman's rank analysis was performed to identify any correlation between citations per admission and the inverse of four types of mortality rate: high-risk conditions, r = 0.20 (P = 0.01); low-risk conditions, r = -0.06 (P = 0.46); deaths after surgery, r = 0.193 (P = 0.019); and overall mortality, r = 0.291 (P < 0.01). CONCLUSION: The results of this preliminary study demonstrate a significant correlation between academic output and mortality rates. The correlation coefficients are small, but the findings of this study encourage further debate.
Subject(s)
Bibliometrics , Hospital Mortality/trends , Research/trends , State Medicine , England/epidemiology , Humans , Qualitative Research , Retrospective Studies , Statistics, NonparametricABSTRACT
BACKGROUND: Scald is the most common cause of burn in children in Australia. The time taken by the burn wound to heal impacts on scar outcome. Commonly scald injuries are treated conservatively; in our unit the practice is that if healing does not occur within 10 days, surgery is used to aid healing with the aim of improving scar outcome. This randomised controlled pilot study compares early treatment regimens to facilitate tissue salvage and reduce the incidence of definitive surgery at 10 days following scald injury. METHODS: All paediatric patients with partial thickness scald injury were clinically assessed between July 1, 2009 and June 30, 2010. A burn of 2% TBSAB or more and deemed not to heal within 10 days, were considered for the trial. These patients were randomised to one of three treatment arms: the local standard treatment (Intrasite™, Acticoat™ and Duoderm(®) dressings every 2-3 days) with surgery at 10 days, Biobrane(®) only or Biobrane(®) and autologous cell suspension using the ReCell(®) kit. The primary outcome was surgery performed after 10 days; secondary outcomes were rates of healing, pain experienced, and scar outcomes. RESULTS: 15% of scald presentations in the 12 month period met the eligibility criteria. 13 patients were recruited into the pilot study; early intervention was associated with a decreased time to healing with fewer dressing changes, less pain and better scar outcomes. CONCLUSION: Investment of surgical resources in the acute stages within 4 days of injury saved on nursing time, dressing, analgesic and scar management costs.