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Biomedical subjects

G Bowes

Publications and source records attributed to G Bowes.

At least 19 recordsLinked to original sources
PubMed2005

Medical record review of deaths, unexpected intensive care unit admissions, and clinician referrals: detection of adverse events and insight into the system.

AIMS AND METHODS: To determine whether a programme of continuous medical record review of deaths, unexpected intensive care unit (ICU) admissions, and admissions referred by medical and nursing staff for specific review, would provide a range of adverse events from which to gain insight into the healthcare system of a large paediatric referral hospital. A quality assurance programme was commenced in 1996. RESULTS: Over a six year period there were 103 255 admissions; 1612 (1.6%) records were reviewed, from which 325 adverse events were detected. Events were associated with operations, procedures and anaesthesia (56.5%), diagnosis and therapy (24%), drug and fluid management (12.6%), and system issues (7%). Medical records were reviewed from 23 of the 28 clinical units. Review of the records and analysis of the adverse events triggered many system changes. CONCLUSIONS: The findings suggest that continuous medical record review may be a valuable method for the detection of adverse events and identifying system issues in children's hospitals.

Child↗
PubMed2003

Life events and early onset depression: cause or consequence?

BACKGROUND: Adverse life events prior to episodes of depression are assumed to play a causal role. Earlier studies have, however, not adequately controlled for the potential confounding effects of previous depression. METHOD: A two-phase study was nested within a six-wave population based cohort study of 1947 adolescents. Interviews at two assessment phases with the CIS-R and CIDI were used to generate ICD-10 diagnoses of depressive disorder. Life events with longer-term contextual threat were reported for the 6 months before first diagnosis and categorized on the basis of participant appraisal as negative and neutral/positive in effects. Previous depressive and anxiety symptoms were measured 6 months earlier. RESULTS: Pre-existing depressive and anxiety symptoms predicted later events, increasing three-fold the risks for both neutral/positive and negative events in females and increased seven-fold the risk of negative events in males. Life events in turn predicted the onset of depressive disorder independently of previous symptoms. Single negative events held an over five-fold elevated risk and multiple events an almost eight-fold higher risk. Personal threat and loss were associated with disorder in females but not males. CONCLUSIONS: The findings are consistent with a causal role for life events in early episodes of depression. The association also reflects a reciprocal relationship in which earlier symptoms predict later events, perhaps as a result of an individual's attempts to change unfavourable social circumstances.

Adaptation, Psychological↗
PubMed2001

A CO(2)-Flux Mechanism Operating via pH-Polarity in Hydrilla verticillata Leaves With C(3) and C(4) Photosynthesis.

The aquatic angiosperm Hydrilla verticillata lacks Kranz anatomy, but has an inducible, C(4)-based, CO(2) concentrating mechanism (CCM) that concentrates CO(2) in the chloroplasts. Both C(3) and C(4) Hydrilla leaves showed light-dependent pH polarity that was suppressed by high dissolved inorganic carbon (DIC). At low DIC (0.25 mol m(-3)), pH values in the unstirred water layer on the abaxial and adaxial sides of the leaf were 4.2 and10.3, respectively. Abaxial apoplastic acidification served as a CO(2) flux mechanism (CFM), making HCO (3) (-) available for photosynthesis by conversion to CO(2). DIC at 10 mol m(-3) completely suppressed acidification and alkalization. The data, along with previous results, indicated that inhibition was specific to DIC, and not a buffer effect. Acidification and alkalization did not necessarily show 1:1 stoichiometry; their kinetics for the apolar induction phase differed, and alkalization was less inhibited by 2.5 mol m(-3) DIC. At low irradiance (50 mumol photons m(-2) s(-1)), where CCM activity in C(4) leaves is minimized, both leaf types had similar DIC inhibition of pH polarity. However, as irradiance increased, DIC inhibition of C(3) leaves decreased. In C(4) leaves the CFM and CCM seemed to compete for photosynthetic ATP and/or reducing power. The CFM may require less, as at low irradiance it still operated maximally, if [DIC] was low. Iodoacetamide (IA), which inhibits CO(2) fixation in Hydrilla, also suppressed acidification and alkalization, especially in C(4) leaves. IA does not inhibit the C(4) CCM, which suggests that the CFM and CCM can operate independently. It has been hypothesized that irradiance and DIC regulate pH polarity by altering the chloroplastic [DIC], which effects the chloroplast redox state and subsequently redox regulation of a plasma-membrane H(+)-ATPase. The results lend partial support to a down-regulatory role for high chloroplastic [DIC], but do not exclude other sites of DIC action. IA inhibition of pH polarity seems inconsistent with the chloroplast NADPH/NADP(+) ratio being the redox transducer. The possibility that malate and oxaloacetate shuttling plays a role in CFM regulation requires further investigation.

Journal Article↗
PubMed2001

Adverse outcomes of alcohol use in adolescents.

AIMS: To compare the occurrence of behaviours occurring under the influence of alcohol in 16-17-year-olds and determine associated risk factors for the different behaviours. DESIGN/SETTING: Cross-sectional survey administered by laptop computers in secondary schools across the state of Victoria, Australia. MEASUREMENT/FINDINGS: The participation rate was 79%. Seventy per cent of participants drank alcohol; 17% of drinkers reported alcohol-related violence (accidents or injuries) and 15% reported problems relating to sex under the influence of alcohol (having sex and later regretting it or having had unsafe sex) in the previous 12 months. Males were more likely to report alcohol-related violence (20% compared to 14% females). Almost one in 10 young people reported having sex while under the influence of alcohol and later regretting it and 10% reported having had unsafe sex. There were no significant gender differences in the reporting rates of alcohol-related sexual risk taking (prop. cum. OR 1.1, 95% CI 0.68-1.9). For alcohol-related injuries, strong independent associations were found with dose of alcohol consumed (prop. cum. OR 2.3, 95% CI 1.3-4.0), frequency of alcohol consumption (prop. cum. OR 2.7, 95% CI 0.94-7.5), antisocial behaviour (prop. cum. OR 2.4, 95% CI 1.4-4.1) and peer drinking (prop. cum. OR 3.3, 95% CI 1.4-8.1). For alcohol-related sexual risk-taking, psychiatric morbidity (prop. cum. OR 4.1, 95% CI 1.9-9.0) and high frequency of alcohol consumption (prop. cum. OR 2.0, 95% CI 0.87-4.6) had strong independent associations. CONCLUSIONS: Physical injury and high-risk sexual behaviour under the influence of alcohol are common in teenagers. Alcohol-related physical injury appears closely related to patterns of alcohol consumption whereas alcohol-related sexual risk-taking is most closely associated with symptoms of depression and anxiety.

Adolescent↗
PubMed2001

Putting harm reduction into an adolescent context.

Drug use is now widespread amongst Australian youth. Substance abuse and dependence are becoming increasingly significant health problems. Approximately 50% of 17-year-old Australians report regular consumption of alcohol and nearly 30% report tobacco smoking. The age of onset of substance use is reported to be decreasing. Between 1993 and 1995 the proportion of heroin users who had used the drug before the age of 16 years increased from 2% to 14%. The debate about youth substance use tends to be polarized between the views of Zero Tolerance and Legalization of drugs. The harm reduction approach spans between these two extremes. Examples of harm reduction strategies, such as education campaigns on safe injecting and needle exchange programs, have been effective in curbing the spread of blood-borne viruses such as HIV amongst intravenous drug using youth. The harm reduction approach, taking social context and developmental stage of the individual into account, may also be applied to adolescents at the less extreme end of the substance use spectrum. It is proposed that the harm reduction framework used in this way enables a rational, relevant and consistent response to contemporary youth substance use, aiming to minimize drug related harm.

Adolescent↗
PubMed2001

Development and validation of the Adolescent Asthma Quality of Life Questionnaire (AAQOL).

Current asthma-specific quality of life questionnaires have major conceptual and methodological deficiencies for use in adolescents. The aim of this study was to develop and validate the "Adolescent Asthma Quality of Life Questionnaire (AAQOL)", specifically developed for adolescents with asthma. One-hundred and eleven adolescents with frequent-episodic or persistent asthma aged 12-17 yrs were recruited from three tertiary paediatric asthma clinics. The standardized multi-step method consisted of: 1) item selection including semistructured interviews (n=14); 2) item reduction and validation (n=66); and 3) assessment of reproducibility (n=31). Item reduction was performed applying the clinical impact method. The 32 item AAQOL covers six domains: symptoms, medication, physical activities, emotion, social interaction and positive effects. There was high internal consistency for the six domains (alpha=0.70-0.90) and for the total score (alpha=0.93). Test-retest reliability was high for all domain scores (r=0.76-0.85) and the total score (r=0.90), indicating high reproducibility of the AAQOL. There was high correlation with the paediatric Asthma Quality of Life Questionnaire (rho=0.81) which focuses primarily on symptoms and emotional well-being. There was weak to moderate correlation with clinical parameters of asthma severity (rho=0.25-0.65). The 32-item Adolescent Asthma Quality of Life Questionnaire is a valid, developmentally age-appropriate and dimensionally comprehensive asthma-specific quality of life measure for use in adolescents.

Adolescent↗
PubMed2000

Evaluation of the effectiveness of an educational intervention for general practitioners in adolescent health care: randomised controlled trial.

OBJECTIVE: To evaluate the effectiveness of an educational intervention in adolescent health designed for general practitioners in accordance with evidence based practice in continuing medical education. DESIGN: Randomised controlled trial with baseline testing and follow up at seven and 13 months. SETTING: Local communities in metropolitan Melbourne, Australia. PARTICIPANTS: 108 self selected general practitioners. INTERVENTION: A multifaceted educational programme for 2.5 hours a week over six weeks on the principles of adolescent health care followed six weeks later by a two hour session of case discussion and debriefing. OUTCOME MEASURES: Objective ratings of consultations with standardised adolescent patients recorded on videotape. Questionnaires completed by the general practitioners were used to measure their knowledge, skill, and self perceived competency, satisfaction with the programme, and self reported change in practice. RESULTS: 103 of 108 (95%) doctors completed all phases of the intervention and evaluation protocol. The intervention group showed significantly greater improvements in all outcomes than the control group at the seven month follow up except for the rapport and satisfaction rating by the standardised patients. 104 (96%) participants found the programme appropriate and relevant. At the 13 month follow up most improvements were sustained, the confidentiality rating by the standardised patients decreased slightly, and the objective assessment of competence further improved. 106 (98%) participants reported a change in practice attributable to the intervention. CONCLUSIONS: General practitioners were willing to complete continuing medical education in adolescent health care and its evaluation. The design of the intervention using evidence based educational strategies proved an effective and quick way to achieve sustainable and large improvements in knowledge, skill, and self perceived competency.

Adolescent↗
PubMed2000

The Gatehouse Project: a systematic approach to mental health promotion in secondary schools.

OBJECTIVE: The objective of this paper is to outline the conceptual background and strategy of intervention for a systematic and sustainable approach to mental health promotion in secondary schools. METHOD: The conceptual origins of the Gatehouse Project are described in terms of the epidemiology of adolescent mental health problems, attachment theory, education reform research and health promotional theory and practice. The elements of health promotional work are described in terms of structural change and priority setting; implementation at multiple levels within the participating schools is described. RESULTS: The conceptual framework of the Gatehouse Project emphasises healthy attachments with peers and teachers through the promotion of a sense of security and trust, effective communication and a sense of positive self-regard based on participation in varied aspects of school and community life. A school social climate profile is derived from a questionnaire survey of students. An adolescent health team uses this information to set priorities for change within the school. Interventions may focus on the promotion of a positive social climate of the whole school or in the classroom. Curriculum-based health education is also used and based on materials that are relevant to the normal developmental experiences of teenagers. These are integrated into the mainstream curriculum and incorporate a strong component of teacher professional development. Lastly, the intervention promotes linkage between the school and broader community with a particular emphasis on the needs of young people at high risk of school drop-out. CONCLUSIONS: Educational environments are complex systems undergoing continuous and simultaneous changes. The Gatehouse Project will provide unique information on the relationship between the social environment and the emotional wellbeing of young people. More importantly it outlines a sustainable process for building the capacity of schools to promote the social and emotional development of young people.

Adolescent↗
PubMed2000

Randomised controlled trial of an educational strategy to increase school-based adolescent hepatitis B vaccination.

OBJECTIVES: This study aimed to evaluate a specifically designed hepatitis B education/promotion curriculum package as part of a successful hepatitis B vaccination delivery system to adolescents. METHODS: A randomised-controlled trial was used to evaluate the effect of the curriculum package (or intervention) on uptake of vaccine. Schools were randomly selected from the metropolitan region of Melbourne to intervention (66 schools or 7,588 students) or control groups (69 schools or 9,823 students). Class teachers administered the intervention to students over 4 class periods before the vaccination course. RESULTS: The difference in mean school uptake between intervention and control was small at 1-2% per dose. 95% confidence intervals around the differences were -5% to 2% per dose and not significant. Intervention schools taught an average of 7 items out of 12 from the curriculum package. Immunisation rates increased by 4-10% per dose between low and high implementation schools, but this trend was not significant. Impact evaluation demonstrated significantly greater knowledge of hepatitis B and vaccination among students in the intervention than the control group. CONCLUSION: Hepatitis B vaccination of pre-adolescents was not increased by the implementation of a curriculum package that successfully increased knowledge and awareness of hepatitis B in a school-based vaccination program. Additional strategies directed at the education of parents, the cooperative role of schools and pro-active providers might also be required to maximise vaccine uptake in this age group.

Adolescent↗
PubMed1999

A computerised screening instrument for adolescent depression: population-based validation and application to a two-phase case-control study.

Computer-administered questionnaires have been little explored as a potentially effective and inexpensive alternative to pencil and paper screening tests. A self-administered computerised form of the revised Clinical Interview Schedule (CIS-R) was compared with the Composite International Diagnostic Interview (CIDI) in a two-phase study of 2032 Australian high school students (mean age 15.7 years) drawn from a stratified random sample of 44 schools in the state of Victoria, Australia. Prevalence, sensitivity and specificity were estimated using weighting to compensate for the two-phase sampling. Point prevalence estimates of depression using the CIS-R were 1.8% for males and 5.6% for females--an overall prevalence of 3.2%. Prevalence estimates for depression in the past 6 months using the CIDI were 5.2% for males and 16.9% for females--an overall estimate of 12.1%. The CIS-R had a positive predictive value (PPV) of 0.49 and negative predictive value (NPV) of 0.91 for CIDI depression in the past 6 months. Specificity was very high (0.97) but sensitivity low (0.18), indicating that a majority of those with a CIDI-defined depressive episode in the past 6 months were not recognised at a single screening using the CIS-R. Even so, the CIS-R has proved at least as good as any pencil and paper questionnaire in identifying cases for nested case-control studies of adolescent depression. Further exploration of strategies such as serial screening to enhance sensitivity is warranted.

Adolescent↗
PubMed1998

Measles-mumps-rubella and hepatitis B vaccination uptake in adolescents: a survey in metropolitan Melbourne.

OBJECTIVE: To measure the uptake of preadolescent measles-mumps-rubella (MMR) and adolescent hepatitis B vaccinations and assess the influence of certain demographic factors on the uptake of these vaccines. DESIGN: Prevalence surveys of uptake rates of preadolescent (school Year 6; age 10-11 years) MMR and adolescent (school Year 9; age 13-14 years) hepatitis B vaccination. SETTING: City of Darebin, an inner northern metropolitan region of Melbourne, 1996. SUBJECTS: 1160 Year 6 school students (580 boys) and 1102 Year 9 school students (548 boys). INTERVENTION: School-based vaccination program administered by Darebin Council. RESULTS: 83% of Year 6 students were vaccinated with the MMR vaccine (84.1% of girls and 81.9% of boys). 71.6% of Year 9 students completed the full course of hepatitis B vaccination (68.9% of boys and 74.2% of girls). There was a higher uptake of MMR in non-government primary schools, but no other demographic factors (sex, economic status, non-English-speaking background, parental education, school class size) were associated. CONCLUSIONS: These uptake rates do not meet National Health and Medical Research Council (NHMRC) recommendations. Further study is required to determine and quantify the factors that affect vaccination uptake in adolescence. Programs may then be developed to improve vaccination uptake.

Adolescent↗
PubMed1998

The course of early smoking: a population-based cohort study over three years.

AIMS: To examine the uptake and course of smoking in a representative adolescent cohort. DESIGN: Six-wave cohort study. PARTICIPANTS: Secondary school students initially aged 14-15 years at 44 schools in the state of Victoria, Australia. MEASUREMENTS: Computerized questionnaire including 7-day retrospective recall for tobacco use. FINDINGS: Prevalence rates for smoking in the past month rose from 25% to 31% and daily smoking 9% to 18% across the 3-year follow-up. Forty-five per cent of the sample smoked at some point but only 18% were daily smokers at the end-point. High rates of short-term cessation were observed for both experimental and daily smokers, but 70% of daily smokers relapsed within 12 months. Occasional smoking at the outset was the strongest predictor of later daily smoking and was also predictive of lower cessation and higher relapse rates. Parental divorce and parental daily smoking were associated with smoking at the outset and parental smoking was strongly predictive of the course of daily smoking. In contrast, prevalence rates of smoking in a subject's school did not significantly predict either smoking initiation or subsequent course. Female daily smokers were half as likely as males to cease smoking, a finding that accounted for gender differences in smoking prevalence in this sample. CONCLUSIONS: The strength of association between occasional and later daily smoking indicates the importance of primary prevention but the variability in the early course indicates that there should be much scope for promotion of adolescent efforts to quit. Both the diminished likelihood of smoking cessation in young women and parental influences on smoking course deserve further exploration.

Adolescent↗
PubMed1998

Young people with spina bifida: transfer from paediatric to adult health care.

An expectation of health care for young people with disability is that quality coordinated care continues to be available as they pass from the paediatric to the adult health care system. While individual clinicians provide this service well, the widespread absence of coordinated multidisciplinary care for young people with spina bifida in the adult health care system is a major deficiency. This paper describes the planning and implementation that underpinned the transfer of 10 young people with spina bifida from a paediatric to an adult service. The range of structural, financial and 'cultural' barriers that need to be overcome before patients can be successfully transferred is highlighted; lessons learned from this model may serve to facilitate the development of other transfer services.

Adolescent↗
PubMed1998

Changes in growth CO2 result in rapid adjustments of ribulose-1, 5-bisphosphate Carboxylase/Oxygenase small subunit gene expression in expanding and mature leaves of rice

The accumulation of soluble carbohydrates resulting from growth under elevated CO2 may potentially signal the repression of gene activity for the small subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcS). To test this hypothesis we grew rice (Oryza sativa L.) under ambient (350 &mgr;L L-1) and high (700 &mgr;L L-1) CO2 in outdoor, sunlit, environment-controlled chambers and performed a cross-switching of growth CO2 concentration at the late-vegetative phase. Within 24 h, plants switched to high CO2 showed a 15% and 23% decrease in rbcS mRNA, whereas plants switched to ambient CO2 increased 27% and 11% in expanding and mature leaves, respectively. Ribulose-1,5-bisphosphate carboxylase/oxygenase total activity and protein content 8 d after the switch increased up to 27% and 20%, respectively, in plants switched to ambient CO2, but changed very little in plants switched to high CO2. Plants maintained at high CO2 showed greater carbohydrate pool sizes and lower rbcS transcript levels than plants kept at ambient CO2. However, after switching growth CO2 concentration, there was not a simple correlation between carbohydrate and rbcS transcript levels. We conclude that although carbohydrates may be important in the regulation of rbcS expression, changes in total pool size alone could not predict the rapid changes in expression that we observed.

Journal Article↗