Impact of elevated fine particulate matter (PM 2.5 ) during landscape fire events on cardiorespiratory hospital admissions in Perth, Western Australia.

BACKGROUND: Australia has experienced extreme fire weather in recent years. Information on the impact of fine particulate matter (PM 2.5 ) from landscape fires (LFs) on cardiorespiratory hospital admissions is limited. METHODS: We conducted a population-based time series study to assess associations between modelled daily elevated PM 2.5 at a 1.5×1.5 km resolution using a modified empirical PM 2.5 exposure model during LFs and hospital admissions for all-cause and cause-specific respiratory and cardiovascular diseases for the study period (2015-2017) in Perth, Western Australia. Multivariate Poisson regressions were used to estimate cumulative risk ratios (RR) with lag effects of 0-3 days, adjusted for sociodemographic factors, weather and time. RESULTS: All-cause hospital admissions and overall cardiovascular admissions increased significantly across each elevated PM 2.5 concentration on most lag days, with the strongest associations of 3% and 7%, respectively, at the high level of ≥12.60 µg/m3 on lag 1 day. For asthma hospitalisation, there was an excess relative risk of up to 16% (RR 1.16, 95% CI 1.00 to 1.35) with same-day exposure for all people, up to 93% on a lag of 1 day in children and up to 52% on a lag of 3 days in low sociodemographic groups. We also observed an increase of up to 12% (RR 1.12, 95% CI 1.02 to 1.24) for arrhythmias on the same exposure day and with over 154% extra risks for angina and 12% for heart failure in disadvantaged groups. CONCLUSIONS: Exposure to elevated PM 2.5 concentrations during LFs was associated with increased risks of all-cause hospital admissions, total cardiovascular conditions, asthma and arrhythmias.

Exposure to fine particulate matter (PM2.5) during landscape fire events and the risk of cardiorespiratory emergency department attendances: a time-series study in Perth, Western Australia.

BACKGROUND: Landscape fires (LFs) are the main source of elevated particulate matter (PM2.5) in Australian cities and towns. This study examined the associations between daily exposure to fine PM2.5 during LF events and daily emergency department attendances (EDA) for all causes, respiratory and cardiovascular outcomes. METHODS: Daily PM2.5 was estimated using a model that included PM2.5 measurements on the previous day, remotely sensed aerosols and fires, hand-drawn tracing of smoke plumes from satellite images, fire danger ratings and the atmosphere venting index. Daily PM2.5 was then categorised as high (≥99th percentile), medium (96th-98th percentile) and low (≤95th percentile). Daily EDA for all-cause and cardiorespiratory conditions were obtained from the Western Australian Emergency Department Data Collection. We used population-based cohort time-series multivariate regressions with 95% CIs to assess modelled daily PM2.5 and EDA associations from 2015 to 2017. We estimated the lag-specific associations and cumulative risk ratios (RR) at lags of 0-3 days, adjusted for sociodemographic factors, weather and time. RESULTS: All-cause EDA and overall cardiovascular presentations increased on all lagged days and up to 5% (RR 1.05, 95% CI 1.03 to 1.06) and 7% (RR 1.07, 95% CI 1.01 to 1.12), respectively, at the high level. High-level exposure was also associated with increased acute lower respiratory tract infections at 1 (RR 1.19, 95% CI 1.10 to 1.29) and 3 (RR 1.17, 95% CI 1.10 to 1.23) days lags and transient ischaemic attacks at 1 day (RR 1.25, 95% CI 1.02 to 1.53) and 2 (RR 1.20, 95% CI 1.01 to 1.42) days lag. CONCLUSIONS: Exposure to PM2.5 concentrations during LFs was associated with an increased risk of all-cause EDA, overall EDA cardiovascular diseases, acute respiratory tract infections and transient ischaemic attacks.

Occupational chemical exposures in pregnancy and fetal growth: evidence from the Born in Bradford Study.

Objectives This prospective birth cohort study evaluated the effect of occupational exposure to endocrine disrupting chemicals (EDC) during pregnancy on inadequate fetal growth as measured by small-for-gestational age (SGA) and inadequate fetal growth measured by percentage of optimal birth weight (POBW). The study also identified the maternal characteristics associated with an increased risk of exposure to EDC. Methods We studied 4142 pregnant women who were in paid employment during pregnancy and participated in a population-based, prospective 2007-2011 birth cohort study, the Born in Bradford Study, with an estimated participation of 80%. Job titles were coded at 26-28 weeks` gestation at a 4-digit level according to 353 unit groups in the 2000 UK Standard Occupational Classification. They were then linked to expert judgment on exposure to each of ten EDC groups as assessed through a job exposure matrix (JEM). We performed generalized estimation equation modelling by a modified Poisson regression to assess the risk of POBW and SGA associated with an increased risk of chemical exposures. Results The frequency of POBW<85 significantly increased for mothers exposed to pesticides [adjusted risk ratio (RRadj) 3.72, 95% confidence interval (CI) 1.40-9.91] and phthalates (RRadj 3.71, 95% CI 1.62-8.51). There was a 5-fold increase risk of SGA for mothers exposed to pesticides (RRadj 5.45, 95% CI 1.59-18.62). Veterinary nurses and horticultural trades were most frequently associated with exposure to pesticides while hairdressers, beauticians, and printing machine minders were associated with phthalates. Conclusion Maternal occupational exposure to estimated concentrations of pesticides and phthalates is associated with impaired fetal growth.

Declining rates of sterilization procedures in Western Australian women from 1990 to 2008: the relationship with age, hospital type, and government policy changes.

OBJECTIVE: To describe trends in age-specific incidence rates of female sterilization (FS) procedures in Western Australia and to evaluate the effects of the introduction of government-subsidized contraceptive methods and the implementation of the Australian government's baby bonus policy on FS rates. DESIGN: Population-based retrospective descriptive study. SETTING: Not applicable. PATIENT(S): All women ages 15-49 undergoing an FS procedure during the period January 1, 1990, to December 31, 2008 (n = 47,360 procedures). INTERVENTION(S): Records from statutory statewide data collections of hospitals separations and births were extracted and linked. MAIN OUTCOME MEASURE(S): Trends in FS procedures and the influence on these trends of the introduction of government policies: subsidization of long-acting reversible contraceptives (Implanon and Mirena) and the Australian baby bonus initiative. RESULT(S): The annual incidence rate of FS procedures declined from 756.9 per 100,000 women in 1990 to 155.2 per 100,000 women in 2008. Compared with the period 1990-1994, women ages 30-39 years were 47% less likely (rate ratio [RR] = 0.53; 95% confidence interval [CI], 0.39-0.72) to undergo sterilization during the period 2005-2008. Adjusting for overall trend, there were significant decreases in FS rates after government subsidization of Implanon (RR = 0.89; 95% CI, 0.82-0.97) and Mirena (RR = 0.81; 95% CI, 0.73-0.91) and the introduction of the baby bonus (RR = 0.70; 95% CI, 0.61-0.81). CONCLUSION(S): Rates of female sterilization procedures in Western Australia have declined substantially across all age groups in the last two decades. Women's decisions to undergo sterilization procedures may be influenced by government interventions that increase access to long-term reversible contraceptives or encourage childbirth.

A study of handling cytotoxic drugs and risk of birth defects in offspring of female veterinarians.

We examined the association of occupational exposure to handling cytotoxic drugs at work with risk of birth defects among a cohort of female veterinarians. This study is a follow up survey of 321 female participants (633 pregnancies) who participated in the Health Risks of Australian Veterinarian project. Data on pregnancies and exposure during each pregnancy was obtained by self-administered mailed questionnaire. Female veterinarians handling cytotoxic drugs during their pregnancy had a two-fold increased risk of birth defects in their offspring (RR = 2.08, 95% CI (1.05-4.15)). Results were consistent in subgroup analysis of those who graduated during the period of 1961 to 1980 (RR = 5.04, 95% CI (1.81, 14.03) and in those working specifically in small and large animal practice. There was no increased risk in the subgroup that graduated after 1980. Women with unplanned pregnancies were more likely to handle cytotoxic drugs on a daily basis (RR = 1.86, 95% CI, 1.00-3.48) and had a higher increased risk of birth defects than those who planned their pregnancies in recent graduates and in those who worked specifically in small animal practice (RR = 2.53, 95% CI, 1.18-5.42). This study suggests that the adverse effects of handling cytotoxic drugs in pregnant women may include an increased risk of birth defects. Pregnancy intention status is an important health behavior and should be considered in prenatal programs.

Living near agricultural pesticide applications and the risk of adverse reproductive outcomes: a review of the literature.

Over the last decade, there has been growing concern about the possible health effects, including a number of adverse reproductive outcomes, from pesticide exposure of people living near agricultural fields. This systematic review evaluates the current epidemiological evidence on the association between living near agricultural pesticide applications and adverse reproductive outcomes, including congenital malformations, stillbirth, intrauterine growth retardation (IUGR), low birthweight, preterm birth and miscarriage. We identified and reviewed 25 studies from a systematic search of the main scientific databases and other sources published in 1950-2007. Study methods and main results were summarised and tabulated according to the year of study, design and type of adverse reproductive outcome. The levels of evidence for reproductive toxicity in humans contributed by each study were assessed and the main limitations associated with these studies discussed. Residential proximity to agricultural pesticide applications may be an important source of ambient environmental exposure, but because of the underlying methodological difficulties, the strength of evidence for its relationship with adverse reproductive outcomes is generally weak and varied between outcomes. The evidence suggested an association for congenital malformations, but because of methodological limitations, such as poor exposure measurement and potentially inadequate control of confounding, a firm conclusion remains beyond reach. For the other outcomes (stillbirth, IUGR, low birthweight, preterm birth and miscarriage) the evidence for any associations was equivocal at best, but some leads warrant further investigation. Improved exposure assessment methods are needed to obtain a more reliable assessment of any risks.

Significant injuries in Australian veterinarians and use of safety precautions.

BACKGROUND: A high injury prevalence has been reported among veterinarians. Studies describing the factors associated with injury have been limited. AIMS: To describe the characteristics of serious injuries and the use of safety precautions at the time of injury in Australian veterinarians. METHODS: Graduates in veterinary medicine from Australian universities completed questionnaires asking about injuries during their professional career including type of injury and circumstances during which injury occurred. RESULTS: A total of 2188 significant injuries were reported. Injuries were most frequently sustained on farms (55%) and associated with undertaking procedural activities (37%) and examining and moving animals (37%). The hand (33%) was the commonest site involved. Injuries to the head and face regions accounted for 15% of all injuries. The most frequent injuries sustained were open wounds (36%), fractures and dislocations (27%) and soft tissue bruising (12%). There were 63 reports of intracranial injury and 19 traumatic amputations reported. Bites, kicks or strikes, animal contact and cutting or scratching were the most frequent mechanisms of injury reported. The major factors reported in association with injury were cattle (22%), horses (21%), dogs (20%) and cats (8%). Fifty-five per cent of veterinarians reported the use of safety precautions at the time of injury. CONCLUSIONS: Veterinarians are a high-risk group for significant injury from animal contacts. The reported use of safety measures and their effectiveness when used by veterinarians appear less than optimal. Further efforts aimed at addressing injury prevention may include developing and implementing improved safe handling practices and safety precautions.

Associations of unscavenged anesthetic gases and long working hours with preterm delivery in female veterinarians.

OBJECTIVE: To examine whether occupational hazards such as anesthetic gases, radiation, pesticides, and working hours in veterinary practice are associated with preterm delivery (before 37 weeks of gestation) in female veterinarians. METHODS: The Health Risks of Australian Veterinarians project was conducted as a questionnaire-based survey of all graduates of Australian veterinary schools during the 40-year period 1960-2000. Approximately 1,200 female veterinarians participated in the survey. Pregnancy was defined as the unit of analysis. We restricted analyses to pregnancies of those women who reported being employed when the pregnancy began and were working only in clinical practice. Of 1,355 pregnancies in total in the file, 744 pregnancies were eligible for the final analysis. RESULTS: The prevalence of preterm birth in women exposed to unscavenged anesthetic gases was 7.3% compared with 5.7% in the general population. In a Cox proportional hazards model controlling for the potential confounders, there was a significant 2.5-fold increase (hazard ratio 2.56, 95% confidence interval [CI] 1.33-4.91) in the risk of preterm delivery in women exposed to unscavenged anesthetic gases for 1 or more hours per week compared with the unexposed group (women who did not perform surgery and those who performed surgery in the presence of a scavenger system). A dose-response relation also was found within this group when exposure was divided into finer categories. There was also a strong and monotonic increase in risk of preterm delivery and the number of hours worked per week with veterinarians working more than 45 hours a week (hazard ratio 3.69, 95% CI 1.40-9.72) compared with those working fewer than 45 hours per week. CONCLUSION: Long working hours and performing surgery in the absence of a scavenger system for anesthetic gases are important risk factors for preterm birth in female veterinarians.

Birth defects in offspring of female veterinarians.

OBJECTIVES: To investigate the risk of birth defects in offspring of female veterinarians exposed to occupational hazards such as radiation, anesthetic gases, and pesticides in veterinary practice. METHODS: The Health Risks of Australian Veterinarians project was conducted as a questionnaire-based survey of all graduates from Australian veterinary schools during the 40-year period 1960-2000. RESULTS: In a multiple logistic regression controlling for the potential confounders, the study showed an increased risk of birth defects in offspring of female veterinarians after occupational exposure to high dose of radiation (taking more than 10 x-ray films per week, odds ratio: 5.73 95% CI: 1.27 to 25.80) and an increase risk of birth defects after occupational exposure to pesticides at least once per week (odds ratio: 2.39 95% CI: 0.99 to 5.77) in veterinarians exclusively working in small animal practice. CONCLUSION: Female veterinarians should be informed of the possible reproductive effects of occupational exposures to radiation and pesticides.

Trends in exposure of veterinarians to physical and chemical hazards and use of protection practices.

OBJECTIVES: To determine whether exposure to physical and chemical occupational hazards and use of protective practices has changed in recent veterinary graduates, and to describe trends in exposure to occupational hazards and use of protective practices over time. METHODS: This paper reports on a retrospective cohort study of veterinarians who graduated from any of the four Australian veterinary schools between 1960 and 2000 and were currently in clinical practice. A self-completed postal questionnaire was used to collect personal details, professional history since graduation, and details of occupational hazards and protective practices used. The prevalence of occupational hazards and use of protective practices was examined by decade of graduation adjusting for gender, type of practice and number of hours worked. RESULTS: After adjusting for other factors, recent graduates tended to take more X-rays than early graduates-graduates since 1990 were 2.59 times more likely to take more than seven X-rays a week compared with graduates before 1970. Recent graduates were also more likely to personally restrain animals during X-rays but were more likely to use X-ray protection. Of those who undertook surgery, recent graduates were more likely to use anaesthetic waste gas scavengers. Over time, veterinary jobs have become more likely to involve longer hours of surgery, but shorter periods of driving. The use of scavengers for waste anaesthetic gas has increased markedly over time from 3.8% of jobs commencing in the 1960s to over 70% for jobs commencing since 1997. CONCLUSIONS: This survey is, to our knowledge, the first to examine trends in the occupational health and safety practices of veterinarians. We have shown that occupational health issues are still important in veterinary practice, with most veterinarians exposed to a number of physical and chemical hazards and many using inadequate protection.

Injury in Australian veterinarians.

BACKGROUND: There are a number of risk factors for traumatic injury in veterinary practice but there is little information on the prevalence of injuries or the factors associated with injury in this profession. AIMS: To identify the prevalence of injuries sustained by veterinarians and the groups most at risk for different types of injury. METHODS: Cross-sectional survey of Australian veterinarians. Subjects were asked whether they had ever had a significant work-related injury, a less serious acute work injury in the last 12 months, a work-related chronic musculoskeletal problem or dog or cat bites. The prevalence of injuries by gender, practice type and decade of graduation were reported and multivariate logistic regression was used to examine the risk of each type of injury. RESULTS: Of 2800 veterinarians, over half (51%) reported a significant work-related injury during their career while 26% of practitioners reported having at least one injury in the previous 12 months. Chronic work-related musculoskeletal problems were reported by 49% of respondents. Dog and cat bites were also very common. After adjusting for graduation year and university, males were more likely than females to have experienced cat or dog bites or have a chronic or significant injury, and large animal veterinarians were most likely to have chronic or significant injuries. CONCLUSIONS: A high injury prevalence was found among Australian veterinarians with large animal practitioners at highest risk. This is the largest study of Australian veterinarians to have been reported and has shown that injuries are common and serious in the profession.