The efficiency of the EmERGE pathway of care for people living with HIV in England.

This study estimated the efficiency of implementing the EmERGE Pathway of Care for people living with medically stable HIV in Brighton, UK; an App enables individuals to communicate with caregivers via their smart-phone. Individual data on the use of HIV outpatient services were collected one-year pre- and post-implementation of EmERGE. Unit costs of HIV outpatient services were calculated and linked with mean use of services per patient year. Primary outcomes were CD4 count and viral load; patient activation and quality-of-life measures were secondary outcomes. 565 participants were followed up April 2017 - October 2018: 93% men, mean age at recruitment 47.0 years (95%CI:46.2-47.8). Outpatient visits decreased by 9% from 5.6 (95%CI:5.4-5.8) to 5.1 (95%CI:4.9-5.3). Face-to-face visits decreased and virtual visits increased. Annual costs decreased by 9% from £751 (95%CI: £722-£780) to £678 (95%CI: £653-£705). Including anti-retroviral drugs, total annual cost decreased from £7,343 (95%CI: £7,314-7,372) to £7,270 (95%CI: £7,245-7,297): ARVs costs comprised 90%. EmERGE was a cost-saving intervention, patients remained engaged and clinically stable. Annual costs were reduced, but ARVs continue to dominate costs. Extension of EmERGE to other people with chronic conditions, could produce greater efficiencies but these needs to be evaluated and monitored over time.

Efficiency of the EmERGE Pathway to provide continuity of care for Spanish people living with medically stable HIV.

OBJECTIVE: Calculate the efficiency of the EmERGE Pathway of Care for medically stable people living with HIV at the Hospital Clínic-IDIBAPS, Barcelona, Spain. METHODS: 546 study participants were followed between 1st July 2016 and 30th October 2019 across three HIV outpatient clinics, but the virtual clinic was closed during the second year. Unit costs were calculated, linked to mean use outpatient services per patient year, one-year before and after the implementation of EmERGE. Costs were combined with primary and secondary outcomes. RESULTS: Annual costs across HIV-outpatient services increased by 8%: €1073 (95%CI €999-€1157) to €1158 (95%CI €1084-€1238). Annual cost of ARVs was €7,557; total annual costs increased by 1% from €8430 (95%CI €8356-8514) to €8515 (95%CI €8441-8595). Annual cost for 433 participants managed in face-to-face (F2F) clinics decreased by 5% from €958 (95%CI 905-1018) to €904 (95%CI 863-945); participants transferred from virtual to F2F outpatient clinics (V2F) increased their annual cost by a factor of 2.2, from €115 (95%CI 94-139) to €251 (95%CI 219-290). No substantive changes were observed in primary and secondary outcomes. CONCLUSION: EmERGE Pathway is an efficient and acceptable intervention. Increases in costs were caused by internal structural changes. The cost reduction observed in F2F clinics were off-set by the transfer of participants from the virtual to the F2F clinics due to the closure of the virtual clinic during the second year of the Study. Greater efficiencies are likely to be achieved by extending the use of the Pathway to other PLHIV.

Resistant fabric warming is a viable alternative to forced-air warming to prevent inadvertent perioperative hypothermia during hemiarthroplasty in the elderly.

BACKGROUND: Surgical site infection (SSI) is associated with inadvertent perioperative hypothermia (IPH). This can be prevented by active patient warming. However, results from comparisons of warming techniques are conflicting. They are based mostly on elective surgery, are from small numbers of patients, and are dominated by the market leader, forced-air warming (FAW). Furthermore, the definition of hypothermia is debatable and systematic reviews of warming systems conclude that a stricter control of temperature is required to study the benefits of warming. AIM: To analyse core temperatures in detail in a large subset of elderly patients who took part in a randomized trial of patient warming following hemiarthroplasty who had received constant zero-flux thermometry to record their temperature. METHODS: Regression models with a fixed effect for warming group and covariates related to temperature were compared for 257 participants randomized to FAW or resistant fabric warming (RFW) from a prior clinical trial. FINDINGS: Those in the RFW group were -0.08°C cooler and had a cumulative hypothermia score -1.87 lower than those in the FAW group. There was no difference in the proportion of hypothermic patients at either <36.5°C or <36.0°C. CONCLUSIONS: This is the first study to provide accurate temperature measurements in patients undergoing a procedure predominantly under regional rather than general anaesthetic. It shows that RFW is a viable alternative to FAW for preventing IPH during hemiarthroplasty. Further studies are needed to measure the benefits of patient warming in terms of clinically important outcomes.

Efficiency of the EmERGE Pathway to provide continuity of care for Spanish people living with medically stable HIV.

OBJECTIVE: Calculate the efficiency of the EmERGE Pathway of Care for medically stable people living with HIV at the Hospital Clínic-IDIBAPS, Barcelona, Spain. METHODS: 546 study participants were followed between 1st July 2016 and 30th October 2019 across three HIV outpatient clinics, but the virtual clinic was closed during the second year. Unit costs were calculated, linked to mean use outpatient services per patient year, one-year before and after the implementation of EmERGE. Costs were combined with primary and secondary outcomes. RESULTS: Annual costs across HIV-outpatient services increased by 8%: €1073 (95%CI €999-€1157) to €1158 (95%CI €1084-€1238). Annual cost of ARVs was €7,557; total annual costs increased by 1% from €8430 (95%CI €8356-8514) to €8515 (95%CI €8441-8595). Annual cost for 433 participants managed in face-to-face (F2F) clinics decreased by 5% from €958 (95%CI 905-1018) to €904 (95%CI 863-945); participants transferred from virtual to F2F outpatient clinics (V2F) increased their annual cost by a factor of 2.2, from €115 (95%CI 94-139) to €251 (95%CI 219-290). No substantive changes were observed in primary and secondary outcomes. CONCLUSION: EmERGE Pathway is an efficient and acceptable intervention. Increases in costs were caused by internal structural changes. The cost reduction observed in F2F clinics were off-set by the transfer of participants from the virtual to the F2F clinics due to the closure of the virtual clinic during the second year of the Study. Greater efficiencies are likely to be achieved by extending the use of the Pathway to other PLHIV.

Reducing Implant Infection in Orthopaedics (RIIiO): Results of a pilot study comparing the influence of forced air and resistive fabric warming technologies on postoperative infections following orthopaedic implant surgery.

BACKGROUND: Active warming during surgery prevents perioperative hypothermia but the effectiveness and postoperative infection rates may differ between warming technologies. AIM: To establish the recruitment and data management strategies needed for a full trial comparing postoperative infection rates associated with forced air warming (FAW) versus resistive fabric warming (RFW) in patients aged >65 years undergoing hemiarthroplasty following fractured neck of femur. METHODS: Participants were randomized 1:1 in permuted blocks to FAW or RFW. Hypothermia was defined as a temperature of <36°C at the end of surgery. Primary outcomes were the number of participants recruited and the number with definitive deep surgical site infections. FINDINGS: A total of 515 participants were randomized at six sites over a period of 18 months. Follow-up was completed for 70.1%. Thirty-seven participants were hypothermic (7.5% in the FAW group; 9.7% in the RFW group). The mean temperatures before anaesthesia and at the end of surgery were similar. For the primary clinical outcome, there were four deep surgical site infections in the FAW group and three in the RFW group. All participants who developed a postoperative infection had antibiotic prophylaxis, a cemented prosthesis, and were operated under laminar airflow; none was hypothermic. There were no serious adverse events related to warming. CONCLUSION: Surgical site infections were identified in both groups. Progression from the pilot to the full trial is possible but will need to take account of the high attrition rate.

Individuals with filaggrin-related eczema and asthma have increased long-term medication and hospital admission costs.

BACKGROUND: Eczema and asthma are chronic diseases with onset usually before the age of 5 years. More than 50% of individuals with eczema will develop asthma and/or other allergic diseases. Several loss-of-function mutations in filaggrin (FLG) have been identified in patients with eczema. However, the association of FLG with healthcare use is unknown. OBJECTIVES: To determine whether FLG mutations are associated with increased prescribing for eczema and asthma and whether increased prescribing is associated with increased healthcare costs. METHODS: A secondary analysis of BREATHE, a cross-sectional study of gene-environment associations with asthma severity, was undertaken. BREATHE data was collected for 1100 participants with asthma, in Tayside and Fife, Scotland during the period 2003-2005. Through collaboration with the Health Informatics Centre in Dundee, BREATHE was linked to accident and emergency, community prescribing and Scottish morbidity records. The data linkage allowed longitudinal exploration of associations between genetic variation and prescribing. RESULTS: An association was found between FLG mutations and increased prescribing for mild and moderate eczema, asthma-reliever medicine and asthma exacerbations. A strong association was found between FLG mutations and prescribing of emollients [incidence rate ratio (IRR) 2·19, 95% confidence interval (CI) 1·36-3·52], treatment for severe eczema (IRR 2·18, 95% CI 1·22-3·91) and a combination of a long-acting ß2 -agonist and corticosteroids (IRR 3·29, 95% CI 1·68-6·43). CONCLUSIONS: The presence of FLG mutations in this cohort is associated with increased prescribing for eczema and asthma. Randomized controlled trials are required to determine if these individuals could benefit from management strategies to reduce morbidity and treatment costs.

Deriving a clinical prediction rule to target sexual healthcare to women attending British General Practices.

Some women attending General Practices (GPs) are at higher risk of unintended pregnancy (RUIP) and sexually transmitted infections (STI) than others. A clinical prediction rule (CPR) may help target resources using psychosocial questions as an acceptable, effective means of assessment. The aim was to derive a CPR that discriminates women who would benefit from sexual health discussion and intervention. Participants were recruited to a cross-sectional survey from six GPs in a city in South-East England in 2016. On arrival, female patients aged 16-44 years were invited to complete a questionnaire that addressed psychosocial factors, and the following self-reported outcomes: 2+ sexual partners in the last year (2PP) and RUIP. For each sexual risk, psychosocial questions were retained from logistic regression modelling which best discriminated women at risk using the C-statistic. Sensitivity and specificity were established in consultation with GP staff. The final sample comprised N = 1238 women. 2PP was predicted by 11 questions including age, binge-drinking weekly, ever having a partner who insulted you often, current smoking, and not cohabiting (C-statistic = 0.83, sensitivity = 73% and specificity = 77%). RUIP was predicted by 5 questions including sexual debut <16 years, and emergency contraception use in the last 6 months (C-statistic = 0.70, sensitivity = 69% and specificity = 57%). 2PP was better discriminated than RUIP but neither to a clinically-useful degree. The finding that different psychosocial factors predicted each outcome has implications for prevention strategies. Further research should investigate causal links between psychosocial factors and sexual risk.

Effectiveness of group body psychotherapy for negative symptoms of schizophrenia: multicentre randomised controlled trial.

BACKGROUND: Negative symptoms of schizophrenia have a severe impact on functional outcomes and treatment options are limited. Arts therapies are currently recommended but more evidence is required. AIMS: To assess body psychotherapy as a treatment for negative symptoms compared with an active control (trial registration: ISRCTN84216587). METHOD: Schizophrenia out-patients were randomised into a 20-session body psychotherapy or Pilates group. The primary outcome was negative symptoms at end of treatment. Secondary outcomes included psychopathology, functional, social and treatment satisfaction outcomes at treatment end and 6-months later. RESULTS: In total, 275 participants were randomised. The adjusted difference in negative symptoms was 0.03 (95% CI -1.11 to 1.17), indicating no benefit from body psychotherapy. Small improvements in expressive deficits and movement disorder symptoms were detected in favour of body psychotherapy. No other outcomes were significantly different. CONCLUSIONS: Body psychotherapy does not have a clinically relevant beneficial effect in the treatment of patients with negative symptoms of schizophrenia.

Randomized clinical trial of sacral versus percutaneous tibial nerve stimulation in patients with faecal incontinence.

BACKGROUND: Sacral nerve stimulation (SNS) is a well established therapy for faecal incontinence (FI). Percutaneous tibial nerve stimulation (PTNS) is a newer, less invasive, treatment. The effectiveness and acceptability of these treatments have not been compared systematically. METHODS: An investigator-blinded randomized pilot trial of PTNS versus SNS with a parallel qualitative study was performed. Quantitative clinical outcomes and qualitative data from patient interviews were collected for both interventions. RESULTS: Forty patients (39 women; mean age 59 years) met the eligibility criteria; 23 were randomized to receive SNS and 17 to PTNS. Fifteen patients progressed to permanent SNS implantation and 16 received a full course of PTNS. Within-group effect sizes were marginally greater for SNS than for PTNS on available-case analysis. Mean(s.d.) FI episodes per week at baseline, and 3 and 6 months of follow-up were: 11·4(12·0), 4·0(4·0) and 4·9(6·9) respectively for SNS compared with 10·6(11·2), 5·8(6·9) and 6·3(6·9) for PTNS. Mean(s.d.) Cleveland Clinic Incontinence Score values at baseline, and 3 and 6 months were: 16·2(3·0), 11·1(5·2) and 10·4(5·6) for SNS versus 15·1(2·7), 11·7(4·4) and 12·1(5·2) for PTNS. Improvement of at least 50 per cent in FI episodes per week at 6 months was seen in 11 of 18 patients in the SNS group compared with seven of 15 in the PTNS group. Effect estimates for SNS with chronic implanted stimulation were larger (10 of 15 patients at 6 months). Disease-specific and generic quality-of-life improvements complemented clinical outcome data. Qualitative analysis of interview data suggested that both treatments had high acceptability amongst patients. CONCLUSION: In the short term, both SNS and PTNS provide some clinical benefit to patients with FI. Registration numbers: 2010-018728-15 and 10479 (http://public.ukcrn.org.uk/search/StudyDetail.aspx?StudyID=10479).

Exercise for depression in care home residents: a randomised controlled trial with cost-effectiveness analysis (OPERA).

BACKGROUND: Many older people living in care homes (long term residential care or nursing homes) are depressed. Exercise is a promising non-drug intervention for preventing and treating depression in this population. OBJECTIVE: To evaluate the impact of a 'whole-home' intervention, consisting of training for residential and nursing home staff backed up with a twice-weekly, physiotherapist-led exercise class on depressive symptoms in care home residents. DESIGN: A cluster randomised controlled trial with a cost-effectiveness analysis to compare (1) the prevalence of depression in intervention homes with that in control homes in all residents contributing data 12 months after homes were randomised (cross-sectional analysis); (2) the number of depressive symptoms at 6 months between intervention and control homes in residents who were depressed at pre-randomisation baseline assessment (depressed cohort comparison); and (3) the number of depressive symptoms at 12 months between intervention and control homes in all residents who were present at pre-randomisation baseline assessment (cohort comparison). SETTING: Seventy-eight care homes in Coventry and Warwickshire and north-east London. PARTICIPANTS: Care home residents aged ≥ 65 years. INTERVENTIONS: Control intervention: Depression awareness training programme for care home staff. Active intervention: A 'whole-home' exercise intervention, consisting of training for care home staff backed up with a twice-weekly, physiotherapist-led exercise group. MAIN OUTCOME MEASURES: Geriatric Depression Scale-15, proxy European Quality of Life-5 Dimensions (EQ-5D), cost-effectiveness from an National Health Service perspective, peripheral fractures and death. RESULTS: We recruited a total of 1054 participants. Cross-sectional analysis: We obtained 595 Geriatric Depression Scale-15 scores and 724 proxy EQ-5D scores. For the cohort analyses we obtained 765 baseline Geriatric Depression Scale-15 scores and 776 proxy EQ-5D scores. Of the 781 who we assessed prior to randomisation, 765 provided a Geriatric Depression Scale-15 score. Of these 374 (49%) were depressed and constitute our depressed cohort. Resource-use and quality-adjusted life-year data, based on proxy EQ-5D, were available for 798 residents recruited prior to randomisation. We delivered 3191 group exercise sessions with 31,705 person attendances and an average group size of 10 (5.3 study participants and 4.6 non-study participants). On average, our participants attended around half of the possible sessions. No serious adverse events occurred during the group exercise sessions. In the cross-sectional analysis the odds for being depressed were 0.76 [95% confidence interval (CI) 0.53 to 1.09] lower in the intervention group at 12 months. The point estimates for benefit for both the cohort analysis (0.13, 95% CI -0.33 to 0.60) and depressed cohort (0.22, 95% CI -0.52 to 0.95) favoured the control intervention. There was no evidence of differences in fracture rates or mortality (odds ratio 1.07, 95% CI 0.79 to 1.48) between the two groups. There was no evidence of differences in the other outcomes between the two groups. Economic analysis: The additional National Health Service cost of the OPERA intervention was £374 per participant (95% CI -£655 to £1404); the mean difference in quality-adjusted life-year was -0.0014 (95% CI -0.0728 to 0.0699). The active intervention was thus dominated by the control intervention, which was more effective and less costly. CONCLUSION: The results do not support the use of a whole-home physical activity and moderate-intensity exercise programme to reduce depression in care home residents. TRIAL REGISTRATION: Current Controlled Trials ISRCTN43769277. FUNDING: This project was funded by the National Institute for Health Research Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 17, No. 18. See the Health Technology Assessment programme website for further project information.

Course of post-traumatic stress disorder following war in the Balkans: 1-year follow-up study.

BACKGROUND: Prevalence rates of post-traumatic stress disorder (PTSD) following the experience of war have been shown to be high. However, little is known about the course of the disorder in people who remained in the area of conflict and in refugees. Method We studied a representative sample of 522 adults with war-related PTSD in five Balkan countries and 215 compatriot refugees in three Western European countries. They were assessed on average 8 years after the war and reinterviewed 1 year later. We established change in PTSD symptoms, measured on the Impact of Events Scale - Revised (IES-R), and factors associated with more or less favourable outcomes. RESULTS: During the 1-year period, symptoms decreased substantially in both Balkan residents and in refugees. The differences were significant for IES-R total scores and for the three subscales of intrusions, avoidance and hyperarousal. In multivariable regressions adjusting for the level of baseline symptoms, co-morbidity with depression predicted less favourable symptom change in Balkan residents. More pre-war traumatic events and the use of mental health services within the follow-up period were associated with less improvement in refugees. CONCLUSIONS: Several years after the war, people with PTSD reported significant symptom improvement that might indicate a fluctuating course over time. Co-morbid depression may have to be targeted in the treatment of people who remained in the post-conflict regions whereas the use of mental health services seems to be linked to the persistence of symptoms among refugees.

Trauma and suicidality in war affected communities.

PURPOSE: The aim was to assess whether experiences of war trauma remain directly associated with suicidality in war affected communities when other risk factors are considered. MATERIALS AND METHODS: In the main sample 3313 participants from former Yugoslavia who experienced war trauma were recruited using a random sampling in five Balkan countries. In the second sample 854 refugees from former Yugoslavia recruited through registers and networking in three Western European countries. Sociodemographic and data on trauma exposure, psychiatric diagnoses and level of suicidality were assessed. RESULTS: In the main sample 113 participants (3.4%) had high suicidality, which was associated with number of potentially traumatic war experiences (odds ratio 1.1) and war related imprisonment (odds ratio 3) once all measured risk factors were considered. These associations were confirmed in the refugee sample with a higher suicidality rate (10.2%). DISCUSSION AND CONCLUSIONS: Number of potentially traumatic war experiences, in particular imprisonment, may be considered as a relevant risk factor for suicidality in people affected by war.

Fabrication of a self-aligned cross-wire quantum-dot chain light emitting diode by molecular beam epitaxial regrowth.

The fabrication of a cross-wire p-i-n light emitting diode (LED) by molecular beam epitaxial overgrowth on mesa-patterned GaAs(100) substrates is presented. Micron-wide mesa stripes fabricated by standard photolithography are subsequently narrowed to sub-micron dimensions by GaAs overgrowth due to net migration towards the mesa top. Chains of InAs quantum dots (QDs) can then be grown in a self-aligned manner on top of the narrow GaAs ridge mesa, forming the active region of the QD-chain LED. The kinetics of the overgrowth is discussed and the electroluminescence operation of the LED is presented.

Association between Gc genotype and susceptibility to TB is dependent on vitamin D status.

Group-specific component (Gc) variants of vitamin D binding protein differ in their affinity for vitamin D metabolites that modulate antimycobacterial immunity. We conducted studies to determine whether Gc genotype associates with susceptibility to tuberculosis (TB). The following subjects were recruited into case-control studies: in the UK, 123 adult TB patients and 140 controls, all of Gujarati Asian ethnic origin; in Brazil, 130 adult TB patients and 78 controls; and in South Africa, 281 children with TB and 182 controls. Gc genotypes were determined and their frequency was compared between cases versus controls. Serum 25-hydroxyvitamin D (25(OH)D) concentrations were obtained retrospectively for 139 Gujarati Asians, and case-control analysis was stratified by vitamin D status. Interferon (IFN)-gamma release assays were also performed on 36 Gujarati Asian TB contacts. The Gc2/2 genotype was strongly associated with susceptibility to active TB in Gujarati Asians, compared with Gc1/1 genotype (OR 2.81, 95% CI 1.19-6.66; p = 0.009). This association was preserved if serum 25(OH)D was <20 nmol.L(-1) (p = 0.01) but not if serum 25(OH)D was > or =20 nmol.L(-1) (p = 0.36). Carriage of the Gc2 allele was associated with increased PPD of tuberculin-stimulated IFN-gamma release in Gujarati Asian TB contacts (p = 0.02). No association between Gc genotype and susceptibility to TB was observed in other ethnic groups studied.

Infections presenting for clinical care in early life and later risk of hay fever in two UK birth cohorts.

BACKGROUND: The 'hygiene hypothesis' proposes that infections in infancy protect against hay fever (HF). We investigated infections during infancy in relation to HF, including rarer ones not previously researched in this context, while examining the role of potential confounding variables. METHODS: From birth cohorts derived within the General Practice Research Database (GPRD) and Doctors Independent Network (DIN) database of computerized patient records from UK general practice, we selected 3549 case-control pairs, matched for practice, age, sex and control follow-up to case diagnosis. Conditional logistic regressions were fitted for each of 30 infections; behavioural problems (BP) acted as a control condition unrelated to HF. Odds ratios (OR), adjusted for consultation frequency were pooled across the databases using fixed effect models. We also adjusted for sibship size in GPRD and a socioeconomic marker in DIN. RESULTS: Upper respiratory tract infections, diarrhoea and vomiting and acute otitis media in infancy were each related with a moderately increased risk of HF in both databases, as were BP. These associations were lost on adjustment for consultation frequency. Only bronchiolitis was significantly associated with a reduced pooled risk of HF after adjustment for consultations (OR = 0.8). Adjustment for sibship size in GPRD and a socioeconomic marker in DIN had little impact on the OR. CONCLUSIONS: Of 30 infectious illnesses investigated, none had strong or consistent associations with HF after adjustment for consultation frequency. Except for bronchiolitis, possibly a chance finding, none of the clinically apparent infections considered appear to have an important role in allergy prevention.

Vaccinations, infections and antibacterials in the first grass pollen season of life and risk of later hayfever.

BACKGROUND: It has been hypothesized that early-life exposure to vaccinations, infections or antibacterials influence allergic disease development. Concurrent exposure to grass pollens may alter any effect. OBJECTIVE: To test the hypothesis that exposure to antibacterials, vaccinations (DTP or MMR) or specific infections during the first grass pollen seasons of life influences the risk of hayfever more than at any other time of the year. METHODS: Nested case-control studies were based on birth cohorts within two large databases of computerized patient records from UK general practices: the General Practice Research Database (GPRD) and Doctors' Independent Network (DIN). Seven thousand ninety-eight hayfever cases, diagnosed after age 2, were matched to controls for practice, age, sex and follow-up of control to case ascertainment date. Conditional logistic regression was used to compare exposure by age 1 (age 2 for MMR) inside vs. outside the grass pollen season (May, June, July). Odds ratios (ORs) were pooled across databases. RESULTS: There were no associations in either database between MMR during vs. outside the grass pollen season and later hayfever. Of 23 infections studied, none were statistically significant; although analyses for the less common conditions were limited by low statistical power. The pooled OR for hayfever comparing exposure to antibacterials only in the grass pollen season with only outside it was 1.20 (95% CI 0.98-1.47) and for DTP was 0.84 (95% CI 0.72-0.98). CONCLUSION: Although an interaction between early exposure to microbial agents and concurrent grass pollen exposure on hayfever risk seemed plausible, there was little evidence to support it across a range of analyses. However, the effect of DTP though weak deserves further study.

Timing of routine immunisations and subsequent hay fever risk.

BACKGROUND: Suggestions that immunisation influences allergic disease risk, either positively (pertussis) or negatively (BCG) are of concern for vaccination policy. AIMS: To determine whether DTP, MMR, and BCG vaccination in infancy influenced hay fever risk. METHODS: Case-control study of 7098 hay fever cases and controls, within two primary care databases. One control per case was matched for practice, age, and sex. Odds ratios (OR) were derived using conditional logistic regression. RESULTS: Compared to those completing in month 5 (base group) (39.3%), DTP unvaccinated children (4.3%) had a similar risk of hay fever (OR = 0.94, 95% CI 0.73 to 1.23). However, those completing after 12 months (4.2%) had a reduced risk (OR = 0.60, 95% CI 0.45 to 0.76) compared to the base group. Compared to those vaccinated in month 14 (base group) (29.5%), MMR unvaccinated children (2.3%) had an OR of 0.79 (95% CI 0.58 to 1.08). Completion of MMR after two years was associated with reduced hay fever risk (OR = 0.62, 95% CI 0.48 to 0.80) compared to the base group. The effects of late immunisation with DTP and MMR were independent. Those vaccinated with BCG by age 2 (2.4%) had an odds ratio of 1.28 (95% CI 0.96 to 1.70). Adjustment for consulting behaviour, social factors, or sibship size did not alter these associations. CONCLUSIONS: Immunisation against DTP or MMR does not increase the risk of hay fever. The lower confidence limit for BCG vaccination contradicts the hypothesised protective effect. The reduced risk of hay fever among children immunised late may be explained by a third factor causing both postponement and reduced risk such as intercurrent febrile illnesses.

In vivo expression of myosin essential light chain using plasmid expression vectors in regenerating frog skeletal muscle.

It is well established that mutations in specific structural elements of the motor protein myosin are directly linked to debilitating diseases involving malfunctioning striated muscle cells. A potential way to study the relationship between myosin structure and function is to express exogenous myosin in vivo and determine contractile properties of the transgenic muscle cells. However, in vivo expression of functional levels of contractile proteins using transient transgenesis in skeletal muscle has not been demonstrated. Presently, we used in vivo gene transfer to express high levels of full-length myosin light chain (MLC) in skeletal muscle fibers of Rana pipiens. Anterior tibialis (AT) muscles were injected with cardiotoxin to cause degeneration and then injected at various stages of regeneration with plasmid expression vectors encoding full-length MLC1(f). In fibers from the most robustly transfected muscles 3 weeks after plasmid injections, trans-MLC1(f) expression averaged 22-43% of the endogenous MLC1(f). Trans-MLC1(f) expression was the same whether a small epitope tag was placed on the C- or N-terminus and was highly variable along individual fibers. Confocal microscopy of skinned fibers showed correct sarcomeric incorporation of trans-MLC1(f). The expression profile of myosin heavy chain isoforms 21 days after transfection was similar to normal AT muscle. These data demonstrate the feasibility of using in vivo gene transfer to probe the structural basis of contractile protein function in skeletal muscle. Based on these promising results, we discuss how further improvements in the level and consistency of myosin transgene expression may be achieved in future studies, and the therapeutic potential of plasmid gene transfer in regenerating muscle.

Association between ambient air pollution and birth weight in São Paulo, Brazil.

OBJECTIVES: Previous studies have implicated air pollution in increased mortality and morbidity, especially in the elderly population and children. More recently, associations with mortality in infants and with some reproductive outcomes have also been reported. The aim of this study is to explore the association between exposure to outdoor air pollution during pregnancy and birth weight. DESIGN: Cross sectional study using data on all singleton full term live births during a one year period. For each individual birth, information on gestational age, type of delivery, birth weight, sex, maternal education, maternal age, place of residence, and parity was available. Daily mean levels of PM(10), sulphur dioxide, nitrogen dioxide, carbon monoxide, and ozone were also gathered. The association between birth weight and air pollution was assessed in regression models with exposure averaged over each trimester of pregnancy. SETTING: São Paulo city, Brazil. RESULTS: Birth weight was shown to be associated with length of gestation, maternal age and instruction, infant gender, number of antenatal care visits, parity, and type of delivery. On adjusting for these variables negative effects of exposure to PM(10) and carbon monoxide during the first trimester were observed. This effect seemed to be more robust for carbon monoxide. For a 1 ppm increase in mean exposure to carbon monoxide during the first trimester a reduction of 23 g in birth weight was estimated. CONCLUSIONS: The results are consistent in revealing that exposure to air pollution during pregnancy may interfere with weight gain in the fetus. Given the poorer outlook for low birthweight babies on a number of health outcomes, this finding is important from the public health perspective.