The effect of high-flow nasal oxygen flow rate on gas exchange in apnoeic patients: a randomised controlled trial.

High-flow nasal oxygen can be administered at induction of anaesthesia for the purposes of pre-oxygenation and apnoeic oxygenation. This intervention is claimed to enhance carbon dioxide elimination during apnoea, but the extent to which this occurs remains poorly quantified. The optimal nasal oxygen flow rate for gas exchange is also unknown. In this study, 114 patients received pre-oxygenation with high-flow nasal oxygen at 50 l.min-1. At the onset of apnoea, patients were allocated randomly to receive one of three nasal oxygen flow rates: 0 l.min-1; 70 l.min-1; or 120 l.min-1. After 4 minutes of apnoea, all oxygen delivery was ceased, tracheal intubation was performed, and oxygen delivery was recommenced when SpO2 was 92%. Mean (SD) PaCO2 rise during the first minute of apnoea was 1.39 (0.39) kPa, 1.41 (0.29) kPa, and 1.26 (0.38) kPa in the 0 l.min-1, 70 l.min-1 and 120 l.min-1 groups, respectively; p = 0.16. During the second, third and fourth minutes of apnoea, mean (SD) rates of rise in PaCO2 were 0.34 (0.08) kPa.min-1, 0.36 (0.06) kPa.min-1 and 0.37 (0.07) kPa.min-1 in the 0 l.min-1, 70 l.min-1 and 120 l.min-1 groups, respectively; p = 0.17. After 4 minutes of apnoea, median (IQR [range]) arterial oxygen partial pressures in the 0 l.min-1, 70 l.min-1 and 120 l.min-1 groups were 24.5 (18.6-31.4 [12.3-48.3]) kPa; 36.6 (28.1-43.8 [9.8-56.9]) kPa; and 37.6 (26.5-45.4 [11.0-56.6]) kPa, respectively; p < 0.001. Median (IQR [range]) times to desaturate to 92% after the onset of apnoea in the 0 l.min-1, 70 l.min-1 and 120 l.min-1 groups, were 412 (347-509 [190-796]) s; 533 (467-641 [192-958]) s; and 531 (462-681 [326-1007]) s, respectively; p < 0.001. In conclusion, the rate of carbon dioxide accumulation in arterial blood did not differ significantly between apnoeic patients who received high-flow nasal oxygen and those who did not.

Feasibility study of computational occupational dosimetry: evaluating a proof-of-concept in an endovascular and interventional cardiology setting.

Individual monitoring of radiation workers is essential to ensure compliance with legal dose limits and to ensure that doses are As Low As Reasonably Achievable. However, large uncertainties still exist in personal dosimetry and there are issues with compliance and incorrect wearing of dosimeters. The objective of the PODIUM (Personal Online Dosimetry Using Computational Methods) project was to improve personal dosimetry by an innovative approach: the development of an online dosimetry application based on computer simulations without the use of physical dosimeters. Occupational doses were calculated based on the use of camera tracking devices, flexible individualised phantoms and data from the radiation source. When combined with fast Monte Carlo simulation codes, the aim was to perform personal dosimetry in real-time. A key component of the PODIUM project was to assess and validate the methodology in interventional radiology workplaces where improvements in dosimetry are needed. This paper describes the feasibility of implementing the PODIUM approach in a clinical setting. Validation was carried out using dosimeters worn by Vascular Surgeons and Interventional Cardiologists during patient procedures at a hospital in Ireland. Our preliminary results from this feasibility study show acceptable differences of the order of 40% between calculated and measured staff doses, in terms of the personal dose equivalent quantity Hp(10), however there is a greater deviation for more complex cases and improvements are needed. The challenges of using the system in busy interventional rooms have informed the future needs and applicability of PODIUM. The availability of an online personal dosimetry application has the potential to overcome problems that arise from the use of current dosimeters. In addition, it should increase awareness of radiation protection among staff. Some limitations remain and a second phase of development would be required to bring the PODIUM method into operation in a hospital setting. However, an early prototype system has been tested in a clinical setting and the results from this two-year proof-of-concept PODIUM project are very promising for future development.

Serum OPG/TRAIL ratio predicts the presence of cardiovascular disease in people with type 2 diabetes mellitus.

AIMS: Cardiovascular disease (CVD) is the leading cause of mortality in type 2 diabetes mellitus (T2DM). Epidemiological studies suggest serum Osteoprotegrin (OPG)/Tumour-necrosis-factor-related-apoptosis-inducing- ligand (TRAIL) ratio may be a useful marker of cardiovascular risk. This study aimed to compare serum levels of TRAIL, OPG and OPG/TRAIL ratio in people with T2DM, with and without a history of CVD, and controls; and to determine which of these indices, if any, predict cardiovascular risk. METHODS: In this single centre observational study of 133 participants, people with T2DM, with and without a history of a cardiovascular event in the last 5 years, were recruited along with a control cohort without T2DM or CVD. Demographic information and anthropometric measurements were recorded. Blood samples were taken and OPG and TRAIL were measured using ELISA. RESULTS: People with T2DM and CVD had higher OPG/TRAIL ratios compared to controls or those with a new diagnosis of T2DM. After adjustment for potential confounding factors, OPG/TRAIL ratio was significantly associated with the presence of CVD in people with T2DM and an OPG/TRAIL ratio cut-off > 38.6 predicted the presence of CVD in this cohort with a sensitivity of 80% and specificity of 82%. CONCLUSION: This study suggests that OPG/TRAIL ratio may have a role as a biomarker of CVD in people with T2DM.

Pre-oxygenation with facemask oxygen vs high-flow nasal oxygen vs high-flow nasal oxygen plus mouthpiece: a randomised controlled trial.

High-flow nasal oxygen used before and during apnoea prolongs time to desaturation at induction of anaesthesia. It is unclear how much oxygenation before apnoea prolongs this time. We randomly allocated 84 participants to 3 minutes of pre-oxygenation by one of three methods: 15 l.min-1 by facemask; 50 l.min-1 by high-flow nasal cannulae only; or 50 l.min-1 by high-flow nasal cannulae plus 15 l.min-1 by mouthpiece. We then anaesthetised and intubated the trachea of 79 participants and waited for oxygen saturation to fall to 92%. Median (IQR [range]) times to desaturate to 92% after pre-oxygenation with facemask oxygen, high-flow nasal oxygen only and high-flow nasal oxygen with mouthpiece, were: 309 (208-417 [107-544]) s; 344 (250-393 [194-585]) s; and 386 (328-498 [182-852]) s, respectively, p = 0.014. Time to desaturation after facemask pre-oxygenation was shorter than after combined nasal and mouthpiece pre-oxygenation, p = 0.006. We could not statistically distinguish high-flow nasal oxygen without mouthpiece from the other two groups for this outcome. Median (IQR [range]) arterial oxygen partial pressure after 3 minutes of pre-oxygenation by facemask, nasal cannulae and nasal cannulae plus mouthpiece, was: 49 (36-61 [24-66]) kPa; 57 (48-62 [30-69]) kPa; and 61 (55-64 [36-72]) kPa, respectively, p = 0.003. Oxygen partial pressure after 3 minutes of pre-oxygenation with nasal and mouthpiece combination was greater than after facemask pre-oxygenation, p = 0.002, and after high-flow nasal oxygen alone, p = 0.016. We did not reject the null hypothesis for the pairwise comparison of facemask pre-oxygenation and high-flow nasal pre-oxygenation, p = 0.14.

Impact of an influenza information pamphlet on vaccination uptake among Polish pupils in Edinburgh, Scotland and the role of social media in parental decision making.

BACKGROUND: In Edinburgh, Scotland, lower influenza vaccine uptake has been observed in primary school children in the Polish community. METHODS: To address this disparity, the Polish-language version of the NHS Health Scotland influenza information pamphlet was updated and distributed in 2018 to all identified Polish pupils attending three pilot schools. The impact of the revised pamphlet was evaluated by examining changes in vaccine uptake in these schools as compared to a control group of schools, and a questionnaire was issued to all Polish parents in the pilot schools to explore their opinions of the pamphlet and preferred sources of immunisation information. RESULTS: On average uptake was 7.4% (95% CI 1.0-13.8%, p < 0.05) higher in the three pilot schools in which the Polish-language pamphlet was distributed (28.7%) than control schools (21.3%). The questionnaire feedback was that 37.3% of respondents felt better-informed about the influenza vaccine following the pamphlet. The respondents reported that the most important information source in deciding whether to vaccinate is previous experience. Healthcare professionals were ranked lower in importance when making a decision. Parents, who refused consent (n = 65) were more likely to source information from social media, friends and family, and Polish websites compared with those who consented (n = 45). CONCLUSIONS: These findings suggest that issuing new Polish health literature was associated with a large increase in consent form return rate and a modest increase in uptake of the influenza vaccine by Polish pupils in the pilot schools. Social media and Polish websites were found to have a greater influence over Polish parents' decision to immunise than UK healthcare staff and health authority information. Intensive effort is required to encourage parents towards information sources where more accurate pro-vaccination messages can be promulgated by national health services and independent expert groups. The role of social media for migrant communities requires careful consideration, especially for vaccine programmes not delivered in their country of birth.

Comparing vaccination hesitancy in Polish migrant parents who accept or refuse nasal flu vaccination for their children.

This study investigates the background to low uptake of nasal influenza vaccination in Polish pupils in Edinburgh, Scotland. In autumn 2018, one week after their child's nasal flu vaccination sessions, 365 Polish parents were sent a questionnaire exploring influences on their vaccination choices. The questionnaire included a series of 10 vaccine hesitancy questions recommended by the WHO SAGE Working Group on Vaccine Hesitancy. 128 questionnaires were returned representing 43.4% of vaccinated, 41.9% of refusing and 23.8% of non-consent form returning parents. Responses highlighted concerns about side effects, new vaccines and the accuracy of professional advice and information sources. There was complacency expressed about vaccination against diseases that are not common any more. Vaccine refusers were consistently more negative about all aspects vaccination and more likely to answer 'don't know'. Almost half of refusers were uncertain about the quality of health information offered to them. Polish migrants in Scotland come with their beliefs about vaccination and modify these as they acculturate to the UK system. They also continue to be influenced by developments and opinions, norms and values from their home country, as well as diaspora media. We have highlighted issues of concern among Polish migrants as a group and gained additional insights by comparing responses of parents who have refused or accepted vaccination. These insights can inform and target messages and strategies to build confidence and encourage immunisation, which should lead to improved vaccine uptake among ethnic population groups.

A qualitative study of vaccination behaviour amongst female Polish migrants in Edinburgh, Scotland.

Vaccine hesitancy is increasing and failure to vaccinate is well-recognised in Europe as a contributing factor to outbreaks of infectious diseases. In Lothian and Scotland, low vaccine uptake has been seen in migrants - notably in the Polish group who have arrived since 2004. The recent Vaccine Confidence in European Union report highlights a concerning recent decline in vaccine confidence in Poland. We held three focus groups containing 13 Polish women about the childhood vaccination programme in Lothian, with specific focus on influenza and Human Papillomavirus vaccinations. Key emergent themes were: trust in the national vaccination policy, trust in the vaccination providers (health professionals), trust in the individual vaccines, balancing the risk of disease, and language and communication. Polish norms, beliefs and behaviours shape how Polish migrants navigate the UK health system and its vaccination programme. While not confident in the Scottish primary care model and its generalist practitioners, the participants liked the ethos of informed consent in Scotland and compared this favourably with the compulsory vaccination policy in Poland. There was a belief that vaccines in Scotland were of higher quality than Poland and with fewer adverse effects. Respondents reported returning to Poland for specialist clinical appointments and diagnostic testing. They regularly access Polish clinical expertise and their opinions about health are influenced by Polish friends and family. They say they have difficulty finding official UK Government and health authority vaccination material and often access Polish media, online resources and information. They are familiar with anti-vaccination activities in Poland. Consequently, there are important unmet information needs for this group of parents who may not be making truly informed choices about vaccination. This requires further investigation especially as migration continues and declining immunisation uptake is reported in many countries across Europe.

Evidence of decreased HPV vaccine acceptance in Polish communities within Scotland.

Human papillomavirus (HPV) vaccines are currently utilised globally in national immunisation programmes. Many new European migrants have settled in the United Kingdom (UK) since the 2004 European Union expansion with approximately 91,000 Polish people resident in Scotland. Following anecdotal reports from several NHS Boards within Scotland of lower HPV vaccine uptake in Polish communities compared with other ethnic minorities, an extract containing both forename and surname, was taken from the Scottish Immunisation Recall System (SIRS) for all girls in S2 and S3 in school years 2014/15 to 2016/17. We then used the OnoMap algorithm software to derive ethnicity. OnoMap identified between 289 and 321 age-eligible girls as Polish with significant disparity noted for completed HPV vaccine uptake between UK (87.2-89.8%) and Polish ethnicities (69.7-77.2%) (P < 0.01). Preliminary discussions with Polish families suggest that vaccine programme differences, trust in medical/healthcare practitioners, and cultural influences may be important drivers of acceptance.

Low uptake of nasal influenza vaccine in Polish and other ethnic minority children in Edinburgh, Scotland.

Failure to vaccinate is well-recognised in Europe as a contributing factor to outbreaks of infectious diseases. Low immunisation rates are often associated with religious, social and ethnic minorities, including refugees or migrant groups. Polish people form Scotland's newest and largest migrant group. They have moved to Scotland since 2004, joining established ethnic minorities from China, the Indian subcontinent and Africa. Scotland has had a seasonal influenza nasal vaccination programme for all primary school children since 2013. We investigated three primary schools in Edinburgh, which had reported low influenza vaccination uptake rates in 2016 and 2017 and found that these schools contained many pupils from ethnic minorities, the majority of whom were Polish. Pupils were categorized as one of three ethnic groupings: White British, Polish and Other Identified Ethnic Minority (OIEM). We ascertained ethnicity using NHS and Education Department information sources and name recognition. We examined vaccine acceptance, declination and non-return of consent forms. In 2017, nasal influenza vaccine uptake was 70.7% (65.2-75.6%, p < 0.001) in White British, 60.9% (53.9-67.6%%, p < 0.001) in other identified ethnic minorities and 25.0% (20.9-29.6%, p > 0.001) in Polish children. White British children were more likely to return completed forms (78.9%) than other groups (OIEM 68.2% and Polish 61.8%). 36.8% of Polish families completed a consent form declining vaccination compared to 6.2% of White British families. These findings demonstrate that significant differences exist in nasal influenza vaccination uptake rates, which have important implications for the trans-national study of vaccine hesitancy. Further qualitative work and an investigation of uptake rates of other childhood immunisations in Polish and other migrant groups is required to assess differences in uptake and behaviours.

Associations between maternal physical activity in early and late pregnancy and offspring birth size: remote federated individual level meta-analysis from eight cohort studies.

OBJECTIVE: Evidence on the impact of leisure time physical activity (LTPA) in pregnancy on birth size is inconsistent. We aimed to examine the association between LTPA during early and late pregnancy and newborn anthropometric outcomes. DESIGN: Individual level meta-analysis, which reduces heterogeneity across studies. SETTING: A consortium of eight population-based studies (seven European and one US) comprising 72 694 participants. METHODS: Generalised linear models with consistent inclusion of confounders (gestational age, sex, parity, maternal age, education, ethnicity, BMI, smoking, and alcohol intake) were used to test associations between self-reported LTPA at either early (8-18 weeks gestation) or late pregnancy (30+ weeks) and the outcomes. Results were pooled using random effects meta-analyses. MAIN OUTCOME MEASURES: Birth weight, large-for-gestational age (LGA), macrosomia, small-for-gestational age (SGA), % body fat, and ponderal index at birth. RESULTS: Late, but not early, gestation maternal moderate to vigorous physical activity (MVPA), vigorous activity, and LTPA energy expenditure were modestly inversely associated with BW, LGA, macrosomia, and ponderal index, without heterogeneity (all: I2  = 0%). For each extra hour/week of MVPA, RR for LGA and macrosomia were 0.97 (95% CI: 0.96, 0.98) and 0.96 (95% CI: 0.94, 0.98), respectively. Associations were only modestly reduced after additional adjustments for maternal BMI and gestational diabetes. No measure of LTPA was associated with risk for SGA. CONCLUSIONS: Physical activity in late, but not early, pregnancy is consistently associated with modestly lower risk of LGA and macrosomia, but not SGA. TWEETABLE ABSTRACT: In an individual participant meta-analysis, late pregnancy moderate to vigorous physical activity modestly reduced birth size outcomes.

Using electronic maternity records to estimate female genital mutilation in Lothian from 2010 to 2013.

Background: Female genital mutilation (FGM) is most commonly encountered in Africa and the Middle East, with migration from FGM-practicing countries meaning it is increasingly seen in Europe. Addressing FGM requires accurate information on who is affected but ascertainment is notoriously difficult. This study estimated FGM prevalence in women presenting for maternity care in the Lothian region of Scotland and compared this with that expected by extrapolation of survey data from women's country of birth. Methods: Electronic clinical records were linked to birth registration data to estimate FGM in the obstetric patients in Lothian from 2010 to 2013. Results: Among all, 107 women affected by FGM were detected, at a rate of 2.8/1000 pregnancies. Of 487 women from UNICEF-recognized FGM-practicing countries who accessed care, 87 (18%) had documented evidence of FGM (three quarters of whom came from Nigeria, Sudan or The Gambia). The prevalence was 54% of the level expected from the extrapolation method. Country of birth had a sensitivity of 81% for FGM. Conclusion: Women from FGM-practicing countries commonly access maternity care in Lothian. This confirms the need for ongoing training and investment in identifying and managing FGM. Matching electronic clinical records with birth registration data was a useful methodology in estimating the level of FGM in the maternity population. In a European country like Scotland with modest migrant numbers, asking country of birth during pregnancy and making sensitive enquiries could detect 81% of women with FGM. Extrapolation from maternal country of birth surveys grossly overestimates the true prevalence.

Influences on Polish migrants' breast screening uptake in Lothian, Scotland.

OBJECTIVES: Ethnic minorities are known to have low uptake of cancer screening programmes and Polish populations to have low breast screening uptake. Breast screening uptake by women in Poland and Polish migrants to Scotland is low. We interviewed Polish women living in Lothian, Scotland, about their attitudes to breast screening. STUDY DESIGN AND METHOD: Telephone interviews were held with a sample of 11 Polish women registered with Lothian general practices and invited for breast screening in 2013 or 2014. Interviews were between November 2014 and February 2015 and were held in Polish then translated, transcribed and analysed thematically. RESULTS: Women interviewed (mean age 58 years) had lived in Scotland for an average of 7.5 years. Seven had undergone breast screening in both Poland and Scotland, three in only Scotland and one in Poland alone. Respondents usually used Scottish and Polish health systems and screening programmes in parallel. Convenience and familiarity shaped screening choices with written information neither accessed nor answering key questions e.g. about coordination between programmes. CONCLUSION: Polish women living in Scotland have difficulties in accessing screening there and often use both Polish and Scottish system. Language issues, misunderstandings about screening and different health cultures are key barriers. Combined information in Polish about all cancer screening programmes could help address low uptake.

Local probe of single phonon dynamics in warm ion crystals.

The detailed characterization of non-trivial coherence properties of composite quantum systems of increasing size is an indispensable prerequisite for scalable quantum computation, as well as for understanding non-equilibrium many-body physics. Here, we show how autocorrelation functions in an interacting system of phonons as well as the quantum discord between distinct degrees of freedoms can be extracted from a small controllable part of the system. As a benchmark, we show this in chains of up to 42 trapped ions, by tracing a single phonon excitation through interferometric measurements of only a single ion in the chain. We observe the spreading and partial refocusing of the excitation in the chain, even on a background of thermal excitations. We further show how this local observable reflects the dynamical evolution of quantum discord between the electronic state and the vibrational degrees of freedom of the probe ion.

Development of multi-disciplinary breast cancer care in Southern Malawi.

The Edinburgh Malawi Breast Cancer Project, a collaborative partnership project between the Queen Elizabeth Central Hospital (QECH) Oncology Unit, Blantyre, Malawi and the Edinburgh Cancer Centre, UK, was established in 2015. The principal objective of the project is to help to develop high quality multi-disciplinary breast cancer care in Malawi. A needs assessment identified three priority areas for further improvement of breast cancer services: multi-disciplinary working, development of oestrogen receptor (ER) testing and management of clinical data. A 3-year project plan was implemented which has been conducted through a series of reciprocal training visits. Key achievements to date have been: (1) Development of a new specialist breast care nursing role; (2) Development of multi-disciplinary meetings; (3) Completion of a programme of oncology nursing education; (4) Development of a clinical database that enables prospective collection of data of all new patients with breast cancer; (5) Training of local staff in molecular and conventional approaches to ER testing. The Edinburgh Malawi Breast Cancer Project is supporting nursing education, data use and cross-specialty collaboration that we are confident will improve cancer care in Malawi. Future work will include the development of a breast cancer diagnostic clinic and a breast cancer registry.

Improvement in symptoms of obstructive sleep apnoea in children following tonsillectomy versus tonsillotomy: a systematic review and meta-analysis.

BACKGROUND: Tonsillotomy (or intracapsular tonsillectomy) is a modern technique which is seen by some as potentially superior to traditional (extracapsular) tonsillectomy for the removal of tonsillar tissue to treat obstructive sleep apnoea in children. It has been suggested that peri-operative pain and haemorrhage and postoperative haemorrhage are reduced with the tonsillotomy technique. However, no systematic reviews have been carried out to assess its efficacy in treating obstructive sleep apnoea compared to tonsillectomy. OBJECTIVE OF REVIEW: To assess whether subjective improvement in symptoms of obstructive sleep apnoea following tonsillotomy is comparable to that following tonsillectomy, measured using a standardised questionnaire, the Obstructive sleep apnoea-18 (OSA-18) tool. TYPE OF REVIEW: Systematic review of the literature and meta-analysis. SEARCH STRATEGY: PubMed (MEDLINE), followed by Ovid (MEDLINE), Cochrane Database of Systematic Reviews, American College of Physicians Journal Club, and the British Medical Journal were searched for articles published in English between 1995 and 2015 inclusive. EVALUATION METHOD: Literature search, systematic review and meta-analysis. Studies examining improvement in mean OSA-18 score following tonsillotomy, improvement in mean OSA-18 score following tonsillectomy, and examining both were selected, examined and used for meta-analysis. Studies with and without concurrent adenoidectomy were included. RESULTS: Four studies examining tonsillotomy and 16 studies examining tonsillectomy were included in the analysis. Using a random effects model, the pooled improvement in OSA-18 score for tonsillotomy was 2.46 (95% CI 1.92-2.99), and for tonsillectomy, it was 2.10 (95% CI 1.91-2.30). There was no significant difference between the methods. CONCLUSION: That there is no significant difference in subjective outcome between tonsillotomy and tonsillectomy may support wider use of tonsillotomy over tonsillectomy for the treatment of obstructive sleep apnoea in children.

Selecting for a sustainable workforce to meet the future healthcare needs of rural communities in Australia.

An undersupply of generalists doctors in rural communities globally led to widening participation (WP) initiatives to increase the proportion of rural origin medical students. In 2002 the Australian Government mandated that 25% of commencing Australian medical students be of rural origin. Meeting this target has largely been achieved through reduced standards of entry for rural relative to urban applicants. This initiative is based on the assumption that rural origin students will succeed during training, and return to practice in rural locations. One aim of this study was to determine the relationships between student geographical origin (rural or urban), selection scores, and future practice intentions of medical students at course entry and course exit. Two multicentre databases containing selection and future practice preferences (location and specialisation) were combined (5862), representing 54% of undergraduate medical students commencing from 2006 to 2013 across nine Australian medical schools. A second aim was to determine course performance of rural origin students selected on lower scores than their urban peers. Selection and course performance data for rural (461) and urban (1431) origin students commencing 2006-2014 from one medical school was used. For Aim 1, a third (33.7%) of rural origin students indicated a preference for future rural practice at course exit, and even fewer (6.7%) urban origin students made this preference. Results from logistic regression analyses showed significant independent predictors were rural origin (OR 4.0), lower Australian Tertiary Admissions Rank (ATAR) (OR 2.1), or lower Undergraduate Medical and Health Sciences Admissions Test Section 3 (non-verbal reasoning) (OR 1.3). Less than a fifth (17.6%) of rural origin students indicated a preference for future generalist practice at course exit. Significant predictors were female gender (OR 1.7) or lower ATAR (OR 1.2), but not rural origin. Fewer (10.5%) urban origin students indicated a preference for generalist practice at course exit. For Aim 2, results of Mann-Whitney U tests confirmed that slightly reducing selection scores does not result in increased failure, or meaningfully impaired performance during training relative to urban origin students. Our multicentre analysis supports success of the rural origin WP pathway to increase rural student participation in medical training. However, our findings confirm that current selection initiatives are insufficient to address the continuing problem of doctor maldistribution in Australia. We argue for further reform to current medical student selection, which remains largely determined by academic meritocracy. Our findings have relevance to the selection of students into health professions globally.

An evidence-based system for health surveillance of occupational divers.

BACKGROUND: The value of the commonly required routine annual medical examination of occupational divers has been questioned, and there is a need for a robust, evidence-based system of health surveillance for this group of workers. AIMS: To determine whether the medical examination and investigation component of occupational divers' routine comprehensive health surveillance adds significantly to the information gained from the questionnaire component in determining fitness for diving. METHODS: An occupational diver database was interrogated to identify divers issued with a 'limited' medical clearance or considered 'unfit' for diving over a 5-year period. Reasons for the 'unfit' or 'limited' designation and the source of the critical information, whether the annual health questionnaire or the medical examination or questionnaire component (or both) of the initial or 5-yearly comprehensive medical evaluation, was recorded. For divers completing the 5-yearly repeat comprehensive medical evaluation, the sensitivity and specificity of the questionnaire alone for determining unfitness for diving was compared with that of a nominal 'gold standard'. RESULTS: Of 5178 certificates issued to 2187 divers over a 5-year period, 158 (3%) were provisionally designated as either 'limited' or 'unfit'. Of nine divers identified by the examination component of the 5-yearly comprehensive medical evaluation, four were eventually designated 'fit', two 'limited', and three were lost to follow up. None who had completed subsequent investigations remained 'unfit'. The sensitivity and specificity of the questionnaire to detect unfit divers compared with the gold standard were 84.6 and 99.3%, respectively, and its accuracy was 98.9%. CONCLUSION: The current New Zealand occupational diver medical certification process, comprising annual health questionnaires and 5-yearly full examinations, detects all health issues critical to the determination of fitness to dive.