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McCrossan P, Mallon O, Shields MD, Russell C, Kennedy L, O'Donoghue D. How we teach children with asthma to use their inhaler: a scoping review. Ital J Pediatr 2022; 48:52. [PMID: 35365200 PMCID: PMC8972732 DOI: 10.1186/s13052-022-01237-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 02/23/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND One reason that asthma remains poorly controlled in children is poor inhaler technique. Guidelines recommend checking inhaler technique at each clinical visit. However, they do not specify how best to train children to mastery of correct inhaler technique. Many children are simply shown how to use inhalers which results in less than 50% with correct inhaler technique. The aim of this scoping review is to explore published literature on teaching methods used to train children to master correct inhaler technique. METHODS We searched (from inception onwards): Medline, Embase, Scopus, Web of Science, CINAHL and the Cochrane library. We included quantitative studies, (e.g. randomised controlled trials, cohort studies and case-control studies), published from 1956 to present, on teaching inhaler technique to children with asthma. Data was extracted onto a data charting table to create a descriptive summary of the results. Data was then synthesised with descriptive statistics and visual mapping. RESULTS Thirty-three papers were identified for full text analysis. Educational interventions were found to be taking place in a variety of clinical areas and by a range of healthcare professional disciplines. 'Brief-Instruction' and 'Teach-Back' were identified as two primary methods of providing inhaler technique training in the majority of papers. Secondary themes identified were; use of written instruction, physical demonstration, video demonstrations and/or use of inhaler devices to augment inhaler technique training. CONCLUSION There are a variety of means by which inhaler technique has been taught to children. These methods are likely applicable to all inhaler types and often involve some form of physical demonstration. Children of all ages can be trained to use their inhaler correctly and by a range of healthcare professionals. We have not analysed the effectiveness of these different interventions, but have described what has been trialled before in an attempt to focus our attentions on what may potentially work best. The majority of these methods can be dichotomised to either 'Brief-Intervention' or 'Teach-Back'. Based on our analysis of this scoping review, we consider the following as areas for future research; how many times does a given intervention have to be done in order to have the desired effect? For what duration does the intervention need to continue to have a long-lasting effect? And, what is the best outcome measure for inhaler technique?. TRIAL REGISTRATION Systematic review registration: Open Science Framework (osf.io/n7kcw).
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Affiliation(s)
- Patrick McCrossan
- Department of Paediatric Respiratory Medicine, Royal Belfast Hospital for Sick Children, Belfast, UK.
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast , Belfast, UK.
| | - Orla Mallon
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast , Belfast, UK
| | - Michael D Shields
- Department of Paediatric Respiratory Medicine, Royal Belfast Hospital for Sick Children, Belfast, UK
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast , Belfast, UK
| | - Catherine Russell
- Department of Paediatric Respiratory Medicine, Royal Belfast Hospital for Sick Children, Belfast, UK
| | - Lesley Kennedy
- Department of Paediatric Respiratory Medicine, Royal Belfast Hospital for Sick Children, Belfast, UK
| | - Dara O'Donoghue
- Department of Paediatric Respiratory Medicine, Royal Belfast Hospital for Sick Children, Belfast, UK
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast , Belfast, UK
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Evans DJ, Schultz A, Verheggen M, Hall GL, Simpson SJ. Identifying pediatric lung disease: A comparison of forced oscillation technique outcomes. Pediatr Pulmonol 2019; 54:751-758. [PMID: 30887730 DOI: 10.1002/ppul.24286] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 01/10/2019] [Indexed: 11/07/2022]
Abstract
RATIONALE Increasing evidence suggests the forced oscillation technique (FOT) has the capacity to provide non-invasive monitoring and diagnosis of respiratory disease in young children. However, which FOT outcomes provide the most pertinent clinical information is currently unknown. The aim of this study was to determine which FOT outcomes were most sensitive for differentiating between health and specific childhood respiratory disease. METHODS Respiratory impedance was measured using a commercial device (i2M, Chess Medical, Belgium) in children aged between 3 and 7 years, who had been diagnosed with either cystic fibrosis (N = 84), asthma (N = 99) or were born very preterm (N = 114). Z-scores were calculated for respiratory system resistance (Rrs) and reactance (Xrs) at 6, 8, and 10 Hz, the resonance frequency (Fres), frequency dependence (Fdep4-24 ), and area under the reactance curve (AX). Pairwise comparisons of the area under the receiver operating characteristic (ROC) curve were used to determine the most relevant FOT variables. RESULTS AND CONCLUSIONS The FOT outcomes best able to discern between health and disease were Fres (P < 0.0001) in cystic fibrosis, Fres (P < 0.0001) in asthma and Xrs8 (P < 0.0001) in children born preterm. These findings suggest the utility of specific FOT outcomes is dependent on the respiratory disease being assessed. It is hoped that a disease-specific approach to interpreting FOT data can help further refine the FOT technique to aid in the diagnosis of children with pediatric respiratory disease.
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Affiliation(s)
- Denby J Evans
- Telethon Kids Institute, Nedlands, Western Australia, Australia
| | - Andre Schultz
- Telethon Kids Institute, Nedlands, Western Australia, Australia.,Division of Pediatrics, Faculty of Health and Medical Sciences, University of Western Australia, Nedlands, Perth, Western Australia, Australia.,Department of Respiratory Medicine, Perth Children's Hospital, Nedlands, Perth, Western Australia, Australia
| | - Maureen Verheggen
- Telethon Kids Institute, Nedlands, Western Australia, Australia.,Division of Pediatrics, Faculty of Health and Medical Sciences, University of Western Australia, Nedlands, Perth, Western Australia, Australia.,Department of Respiratory Medicine, Perth Children's Hospital, Nedlands, Perth, Western Australia, Australia
| | - Graham L Hall
- Telethon Kids Institute, Nedlands, Western Australia, Australia.,School of Physiotherapy and Exercise Science, Faculty of Health Sciences, Curtin University, Perth, Australia
| | - Shannon J Simpson
- Telethon Kids Institute, Nedlands, Western Australia, Australia.,School of Physiotherapy and Exercise Science, Faculty of Health Sciences, Curtin University, Perth, Australia
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Abstract
BACKGROUND Asthma is a common chronic disease worldwide. Inhalers are often prescribed to help control asthma symptoms, improve quality of life and reduce the risk of exacerbations or flare-ups. However, evidence suggests that many people with asthma do not use their inhaler correctly. It is therefore important to evaluate whether interventions aimed specifically at improving technique are effective and safe, and whether use of these interventions translates into improved clinical outcomes. OBJECTIVES To assess the impact of interventions to improve inhaler technique on clinical outcomes and safety in adults and children with asthma. SEARCH METHODS We searched the Cochrane Airways Trials Register, which contains records compiled from multiple electronic and handsearched resources. We also searched trial registries and reference lists of primary studies. We conducted the most recent search on 23 November 2016. SELECTION CRITERIA We included studies comparing a group of adults or children with asthma receiving an inhaler technique intervention versus a group receiving a control or alternative intervention. We included parallel and cluster-randomised trials of any duration conducted in any setting, and planned to include only the first phase of any cross-over trials identified. We included studies reported as full-text articles, those published as abstracts only and unpublished data. DATA COLLECTION AND ANALYSIS Two review authors screened the search results for eligible studies. We extracted outcome data, assessed risk of bias in duplicate and resolved discrepancies by involving another review author. We grouped studies making similar comparisons by consensus (e.g. all those comparing enhanced inhaler technique education vs usual care) and conducted meta-analyses only if treatments, participants and the underlying clinical question were similar enough for pooling to make sense. We analysed dichotomous data as odds ratios, and continuous data as mean differences or standardised mean differences, all with random-effects models. We described skewed data narratively. We graded the results and presented evidence in 'Summary of findings' tables for each comparison. Primary outcomes were inhaler technique, asthma control and exacerbations requiring at least oral corticosteroids (OCS). MAIN RESULTS This review includes 29 parallel randomised controlled trials (RCTs) (n = 2210), although not all reported relevant or useable data. All participants had asthma, and follow-up ranged from 2 to 26 weeks. Most studies were at low or unclear risk of selection and attrition biases and at high risk for biases associated with blinding. We considered most of the evidence to be of low quality owing to these biases and to imprecision in the estimates of effect.We classified studies into three comparisons: enhanced face-to-face training session(s), multi-media-delivered inhaler training (e.g. DVD, computer app or game) and technique feedback devices. Differences between interventions, populations and outcome measures limited quantitative analyses, particularly for exacerbations, adverse events, unscheduled visits to a healthcare provider and absenteeism from work or school.Enhanced inhaler technique education and multi-media training improved technique in most studies immediately after the intervention and at follow-up, although the variety of checklists used meant that this was difficult to assess reliably. For both adults and children, how and when inhaler technique was assessed appeared to affect whether inhaler technique improved and by how much.Analyses of the numbers of people who demonstrated correct or 'good enough' technique were generally more useful than checklist scores. Adult studies of enhanced education showed benefit when this metric was used at 2 to 26 weeks' follow-up (odds ratio (OR) 5.00, 95% confidence interval (CI) 1.83 to 13.65; 258 participants; three studies; 31 per 100 with correct technique in the control group compared with 69 (95% CI 45 to 86) in the education group; moderate-quality evidence). A similar result was seen in studies looking at feedback devices at four weeks' follow-up (OR 4.80, 95% CI 1.87 to 12.33; 97 participants; one study; 51 per 100 with correct technique in the control group compared with 83 (95% CI 66 to 93) in the feedback group; low-quality evidence). However, the benefit of multi-media training for adults even immediately after the intervention was uncertain (OR 2.15, 95% CI 0.84 to 5.50; 164 participants; two studies; I² = 49%; 30 per 100 in the control group with correct technique compared with 47 (95% CI 26 to 70) in the multi-media group; moderate-quality evidence). Evidence tended to be less clear for children, usually because results were based on fewer and smaller studies.Some studies did not report exacerbations in a way that allowed meta-analysis; others provided inconclusive results. Inhaler technique interventions provided some benefit for asthma control and quality of life but generally did not lead to consistent or important clinical benefits for adults or children. Confidence intervals included no difference or did not reach a threshold that could be considered clinically important. Responder analyses sometimes showed improvement among more people in the intervention groups, even though the mean difference between groups was small. We found no evidence about harms. AUTHORS' CONCLUSIONS Although interventions to improve inhaler technique may work in some circumstances, the variety of interventions and measurement methods used hampered our ability to perform meta-analyses and led to low to moderate confidence in our findings. Most included studies did not report important improvement in clinical outcomes. Guidelines consistently recommend that clinicians check regularly the inhaler technique of their patients; what is not clear is how clinicians can most effectively intervene if they find a patient's technique to be inadequate, and whether such interventions will have a discernible impact on clinical outcomes.
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Affiliation(s)
- Rebecca Normansell
- Cochrane Airways, Population Health Research Institute, St George's, University of London, London, UK, SW17 0RE
| | - Kayleigh M Kew
- Cochrane Airways, Population Health Research Institute, St George's, University of London, London, UK, SW17 0RE
- British Medical Journal Technology Assessment Group (BMJ-TAG), BMJ Knowledge Centre, BMA House, Tavistock Square, London, UK, WC1H 9JR
| | - Alexander G Mathioudakis
- Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, UK
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Feasibility Study of Interactive Game Technologies to Improve Experience with Inhaler Spacer Devices in Young Children. Pulm Ther 2016. [DOI: 10.1007/s41030-016-0023-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Shaw N, Le Souëf P, Turkovic L, McCahon L, Kicic A, Sly PD, Devadason S, Schultz A. Pressurised metered dose inhaler-spacer technique in young children improves with video instruction. Eur J Pediatr 2016; 175:1007-12. [PMID: 27251668 DOI: 10.1007/s00431-016-2738-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 05/16/2016] [Accepted: 05/23/2016] [Indexed: 10/21/2022]
Abstract
UNLABELLED The importance of good device technique to maximise delivery of aerosolised medications is widely recognised. Pressurised metered dose inhaler (pMDI)-spacer technique was investigated in 122 children, aged 2-7 years, with asthma. Eight individual steps of device technique were evaluated before and after viewing an instructional video for correct device technique. Video measurements were repeated every three months for nine months. Device technique improved directly after video instruction at the baseline study visit (p < 0.001) but had no immediate effect at subsequent visits. Additionally, pMDI-spacer technique improved with successive visits over one year for the group overall as evidenced by increases in the proportion of children scoring maximal (p = 0.02) and near-maximal (p = 0.04) scores. CONCLUSION Repeated video instruction over time improves inhaler technique in young children. WHAT IS KNOWN • Correct device technique is considered essential for sufficient delivery of inhaled medication. • Poor inhaler use is common in young asthmatic children using pressurised metered dose inhalers and spacers. What is New: • Video instruction could be used as a strategy to improve device technique in young children.
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Affiliation(s)
- Nicole Shaw
- Clinical Sciences, Telethon Kids Institute, Subiaco, Western Australia, Australia, 6008
| | - Peter Le Souëf
- Department of Respiratory Medicine, Princess Margaret Hospital for Children, Subiaco, Western Australia, Australia, 6008.,School of Paediatrics and Child Health, University of Western Australia, Nedlands, Western Australia, Australia, 6009
| | - Lidija Turkovic
- Clinical Sciences, Telethon Kids Institute, Subiaco, Western Australia, Australia, 6008
| | - Lucy McCahon
- Clinical Sciences, Telethon Kids Institute, Subiaco, Western Australia, Australia, 6008
| | - Anthony Kicic
- Clinical Sciences, Telethon Kids Institute, Subiaco, Western Australia, Australia, 6008.,Department of Respiratory Medicine, Princess Margaret Hospital for Children, Subiaco, Western Australia, Australia, 6008.,School of Paediatrics and Child Health, University of Western Australia, Nedlands, Western Australia, Australia, 6009.,Centre for Cell Therapy and Regenerative Medicine, The University of Western Australia and Harry Perkins Institute, Nedlands, Western Australia, Australia, 6009
| | - Peter D Sly
- Child Health Research Centre, University of Queensland, Brisbane, Queensland, Australia, 4029
| | - Sunalene Devadason
- School of Paediatrics and Child Health, University of Western Australia, Nedlands, Western Australia, Australia, 6009
| | - André Schultz
- Clinical Sciences, Telethon Kids Institute, Subiaco, Western Australia, Australia, 6008. .,Department of Respiratory Medicine, Princess Margaret Hospital for Children, Subiaco, Western Australia, Australia, 6008. .,School of Paediatrics and Child Health, University of Western Australia, Nedlands, Western Australia, Australia, 6009.
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Rottier BL, Eber E, Hedlin G, Turner S, Wooler E, Mantzourani E, Kulkarni N. Monitoring asthma in childhood: management-related issues. Eur Respir Rev 2016; 24:194-203. [PMID: 26028632 PMCID: PMC9487817 DOI: 10.1183/16000617.00003814] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Management-related issues are an important aspect of monitoring asthma in children in clinical practice. This review summarises the literature on practical aspects of monitoring including adherence to treatment, inhalation technique, ongoing exposure to allergens and irritants, comorbid conditions and side-effects of treatment, as agreed by the European Respiratory Society Task Force on Monitoring Asthma in Childhood. The evidence indicates that it is important to discuss adherence to treatment in a non-confrontational way at every clinic visit, and take into account a patient's illness and medication beliefs. All task force members teach inhalation techniques at least twice when introducing a new inhalation device and then at least annually. Exposure to second-hand tobacco smoke, combustion-derived air pollutants, house dust mites, fungal spores, pollens and pet dander deserve regular attention during follow-up according to most task force members. In addition, allergic rhinitis should be considered as a cause for poor asthma control. Task force members do not screen for gastro-oesophageal reflux and food allergy. Height and weight are generally measured at least annually to identify individuals who are susceptible to adrenal suppression and to calculate body mass index, even though causality between obesity and asthma has not been established. In cases of poor asthma control, before stepping up treatment the above aspects of monitoring deserve closer attention. ERS review summarising and discussing the management-related issues regarding the monitoring of asthma in childhoodhttp://ow.ly/JfjGs
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Affiliation(s)
- Bart L Rottier
- Dept of Pediatric Pulmonology and Allergology, GRIAC Research Institute, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Ernst Eber
- Respiratory and Allergic Disease Division, Dept of Paediatrics and Adolescence Medicine, Medical University of Graz, Graz, Austria
| | - Gunilla Hedlin
- Dept of Women's and Children's Health and Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden Astrid Lindgren Children's Hospital, Stockholm, Sweden
| | - Steve Turner
- Dept of Paediatrics, University of Aberdeen, Aberdeen, UK
| | | | - Eva Mantzourani
- Dept of Paediatrics, University Hospital of Heraklion, University of Crete, Heraklion, Greece
| | - Neeta Kulkarni
- Leicestershire Partnership Trust and Dept of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
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7
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Devices for oral and respiratory paediatric medicines: What do healthcare professionals think? Int J Pharm 2015; 492:304-15. [DOI: 10.1016/j.ijpharm.2015.05.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 05/07/2015] [Accepted: 05/14/2015] [Indexed: 11/16/2022]
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Gachelin E, Vecellio L, Dubus JC. [Critical evaluation of inhalation spacer devices available in France]. Rev Mal Respir 2015; 32:672-81. [PMID: 26163392 DOI: 10.1016/j.rmr.2015.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 01/19/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To identify the spacer devices sold in France and to provide a critical evaluation in the light of the published data. MATERIALS AND METHODS We contacted the pharmaceutical companies, manufacturers and distributors of each spacer in order to obtain their technical parameters and the results of any in vitro or in vivo studies. A review of the literature via PubMed completed the first set of data. We were interested in the quantity of fine particles (less than 5 μm diameter) obtained with a cascade impactor at paediatric flow rates, for all inhaled drugs available in France. RESULTS Eleven spacer devices were available in 2013 in France (Ablespacer®, Aerochamber Plus®, Babyhaler®, VHC Arrow®, L'Espace®, Funhaler®, Inhaler®, Itinhaler®, OptiChamber Diamond®, Tipshaler® and Vortex®), but three are no longer manufactured (Babyhaler®, Funhaler® and Inhaler®). All were small volume spacers, sold with facial masks of several different sizes. Four were antistatic (Aerochamber Plus®, Intinhaler®, OptiChamber Diamond® and Vortex®). Only salbutamol was tested with all the devices. Inhaled corticosteroids were tested with some and combinations were studied only with Ablespacer®, Aerochamber Plus®, Itinhaler®, and Vortex®. The results were difficult to interpret because the studies were conducted with very different protocols. The only clinical studies were conducted with Aerochamber Plus®, L'Espace® and Vortex®. CONCLUSION There was a great disparity between commercialized spacer devices in terms of the available data describing their in vitro performance.
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Affiliation(s)
- E Gachelin
- Unité de pneumologie pédiatrique, CHU Timone-Enfants, AP-HM, 13000 Marseille, France
| | - L Vecellio
- DTF-Aerodrug, faculté de médecine, 37032 Tours, France; Inserm U1100/EA6305, centre d'étude des pathologies respiratoires, faculté de médecine, université François-Rabelais, 37032 Tours, France
| | - J-C Dubus
- Unité de pneumologie pédiatrique, CHU Timone-Enfants, AP-HM, 13000 Marseille, France.
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Ammari WG, Toor S, Chetcuti P, Stephenson J, Chrystyn H. Evaluation of asthma control, parents' quality of life and preference between AeroChamber Plus and AeroChamber Plus Flow-Vu spacers in young children with asthma. J Asthma 2014; 52:301-7. [PMID: 25226171 DOI: 10.3109/02770903.2014.966111] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The AeroChamber Plus (AC) valved holding chamber has been enhanced to include the Flow-Vu (FV) inspiratory flow indicator that provides visual inhalation feedback during use. We have investigated if FV alters asthma control and whether parents accept it. METHODS At visit 1, children with asthma, age 1-5 years, used an AC with their pressurised metered dose inhaler and 2 weeks later (visit 2) they were randomised to use either AC or FV. Subjects returned 6 (visit 3) and 12 (visit 4) weeks later. The Asthma Control (ACQ) and Paediatric Asthma Caregiver's Quality of Life (PACQLQ) questionnaires were scored at each visit, and their peak inhalation flow (PIF) when they used their spacer was measured. RESULTS Forty participants in each group completed the study. There was no difference in the ACQ scores from visits 2 to 4 between the two groups. The improvements in the PACQLQ scores were greater in the FV group (p = 0.029). The mean difference (95% confidence interval) for the change from visits 2 to 4 between FV and AC groups was 0.05 (-0.33, 0.43) and 0.39 (0.035, 0.737) for the ACQ and PACQLQ, respectively. Most parents preferred the FV (p < 0.001). There was no difference in the PIF rates at each visit and between the two spacers. CONCLUSIONS There was no change in asthma control of the young children but that of their parents improved. Parents preferred the FV and this could be related to their improved perception of their children's asthma control by better PACQLQ scores.
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Affiliation(s)
- Wesam G Ammari
- School of Pharmacy and Medical Sciences, Al-Ahliyya Amman University , Amman , Jordan
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Abstract
The principal aims of asthma management in childhood are to obtain symptom control that allows individuals to engage in unrestricted physical activities and to normalize lung function. These aims should be achieved using the fewest possible medications. Ensuring a correct diagnosis is the first priority. The mainstay of asthma management remains pharmacotherapy. Various treatment options are discussed. Asthma monitoring includes the regular assessment of asthma severity and asthma control, which then informs decisions regarding the stepping up or stepping down of therapy. Delivery systems and devices for inhaled therapy are discussed, as are the factors influencing adherence to prescribed treatment. The role of the pediatric health care provider is to establish a functional partnership with the child and their family in order to minimize the impact of asthma symptoms and exacerbations during childhood.
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Affiliation(s)
- André Schultz
- School of Paediatrics and Child Health, University of Western Australia, Perth, Australia
- Department of Respiratory Medicine, Princess Margaret Hospital for Children, Perth, Australia
- Department of Paediatric and Adolescent Medicine, Princess Margaret Hospital for Children, Perth, Australia
| | - Andrew C. Martin
- School of Paediatrics and Child Health, University of Western Australia, Perth, Australia
- Department of Paediatric and Adolescent Medicine, Princess Margaret Hospital for Children, Perth, Australia
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