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Iyer KK, Roberts JA, Waak M, Vogrin SJ, Kevat A, Chawla J, Haataja LM, Lauronen L, Vanhatalo S, Stevenson NJ. A growth chart of brain function from infancy to adolescence based on EEG. EBioMedicine 2024; 102:105061. [PMID: 38537603 PMCID: PMC11026939 DOI: 10.1016/j.ebiom.2024.105061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 04/14/2024] Open
Abstract
BACKGROUND In children, objective, quantitative tools that determine functional neurodevelopment are scarce and rarely scalable for clinical use. Direct recordings of cortical activity using routinely acquired electroencephalography (EEG) offer reliable measures of brain function. METHODS We developed and validated a measure of functional brain age (FBA) using a residual neural network-based interpretation of the paediatric EEG. In this cross-sectional study, we included 1056 children with typical development ranging in age from 1 month to 18 years. We analysed a 10- to 15-min segment of 18-channel EEG recorded during light sleep (N1 and N2 states). FINDINGS The FBA had a weighted mean absolute error (wMAE) of 0.85 years (95% CI: 0.69-1.02; n = 1056). A two-channel version of the FBA had a wMAE of 1.51 years (95% CI: 1.30-1.73; n = 1056) and was validated on an independent set of EEG recordings (wMAE = 2.27 years, 95% CI: 1.90-2.65; n = 723). Group-level maturational delays were also detected in a small cohort of children with Trisomy 21 (Cohen's d = 0.36, p = 0.028). INTERPRETATION A FBA, based on EEG, is an accurate, practical and scalable automated tool to track brain function maturation throughout childhood with accuracy comparable to widely used physical growth charts. FUNDING This research was supported by the National Health and Medical Research Council, Australia, Helsinki University Diagnostic Center Research Funds, Finnish Academy, Finnish Paediatric Foundation, and Sigrid Juselius Foundation.
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Affiliation(s)
- Kartik K Iyer
- Brain Modelling Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia; Faculty of Medicine, The University of Queensland, Brisbane, Australia.
| | - James A Roberts
- Brain Modelling Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Michaela Waak
- Faculty of Medicine, The University of Queensland, Brisbane, Australia; Queensland Children's Hospital, Brisbane, Australia
| | | | - Ajay Kevat
- Faculty of Medicine, The University of Queensland, Brisbane, Australia; Queensland Children's Hospital, Brisbane, Australia
| | - Jasneek Chawla
- Faculty of Medicine, The University of Queensland, Brisbane, Australia; Queensland Children's Hospital, Brisbane, Australia
| | - Leena M Haataja
- Departments of Physiology and Clinical Neurophysiology, BABA Center, Paediatric Research Center, Children's Hospital, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Leena Lauronen
- Departments of Physiology and Clinical Neurophysiology, BABA Center, Paediatric Research Center, Children's Hospital, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Sampsa Vanhatalo
- Departments of Physiology and Clinical Neurophysiology, BABA Center, Paediatric Research Center, Children's Hospital, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Nathan J Stevenson
- Brain Modelling Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia.
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Theile H, Phua Y, Bade S, O'Mahony S, Chawla J, Suresh S, Theile R. Conservative Airway Management Successful in Majority of Infants With Pierre-Robin Sequence at Queensland Children's Hospital: A Retrospective Review. J Craniofac Surg 2024:00001665-990000000-01422. [PMID: 38534164 DOI: 10.1097/scs.0000000000010083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 01/27/2024] [Indexed: 03/28/2024] Open
Abstract
PURPOSE Pierre-Robin Sequence (PRS) is a congenital abnormality characterized by micrognathia, glossoptosis, and variable severity upper airway obstruction. Clear management algorithms are lacking, particularly the indications for surgical versus nonsurgical intervention. The authors reviewed the management of these children in Queensland. METHODS All children diagnosed with PRS at Queensland Children's Hospital from April 2014 to October 2019 were identified (n=45), and their charts were retrospectively reviewed. Three management patterns emerged: prone/lateral positioning, nasopharyngeal airway (NPA) use, and surgery (tracheostomy or mandibular distraction). RESULTS Most children (n=30; 67%) were managed successfully nonsurgically with an NPA (median age of insertion 0.25 mo, median duration 5.0 mo). Of these, 12 patients (40%) also required supplemental oxygen. The median age of NPA cessation was 5.5 months, with oxygen therapy ceasing at a median 8.25 months, upon which no further support was required. The remaining majority (n=13; 29%) of children were managed without an NPA, using positioning alone (10/13; 77%) or positioning combined with supplemental oxygen (1/13), CPAP (1/13), or both adjunct measures (1/13). Only 2 patients underwent surgical intervention. Feeding supplementation using nasogastric tube was necessary in 78% of patients for a median duration of 4 months. Cleft palate co-existed in all but one patient. CONCLUSION Management of upper airway obstruction in PRS children is variable between units. Over a 5-year period, 96% of children with PRS were successfully managed without surgical intervention at the Queensland Children's Hospital. These findings contrast with some other literature and may suggest that more careful consideration of surgical intervention in PRS patients is prudent.
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Affiliation(s)
- Harrison Theile
- Department of Plastic and Reconstructive Surgery, Queensland Children's Hospital, Brisbane, Australia
| | - Yun Phua
- Department of Plastic and Reconstructive Surgery, Queensland Children's Hospital, Brisbane, Australia
| | - Stuart Bade
- Department of Plastic and Reconstructive Surgery, Queensland Children's Hospital, Brisbane, Australia
| | - Susan O'Mahony
- Department of Plastic and Reconstructive Surgery, Queensland Children's Hospital, Brisbane, Australia
| | - Jasneek Chawla
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia
- Kids Sleep Research Team, Child Health Research Centre, University of Queensland, Brisbane, Australia
| | - Sadasivam Suresh
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia
| | - Richard Theile
- Department of Plastic and Reconstructive Surgery, Queensland Children's Hospital, Brisbane, Australia
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Wilson A, Hartnett C, Kilner D, Davies K, Slee N, Chawla J, Iyer K, Kevat A. Real-world utility of overnight oximetry for the screening of obstructive sleep apnea in children. Int J Pediatr Otorhinolaryngol 2024; 178:111892. [PMID: 38387157 DOI: 10.1016/j.ijporl.2024.111892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 01/23/2024] [Accepted: 02/07/2024] [Indexed: 02/24/2024]
Abstract
BACKGROUND Obstructive sleep apnea (OSA) is a common problem in children and can result in developmental and cognitive complications if untreated. The gold-standard tool for diagnosis is polysomnography (PSG); however, it is an expensive and time-consuming test to undertake. Overnight oximetry has been suggested as a faster and cheaper initial test in comparison to PSG as it can be performed at home using limited, reusable equipment. AIM This retrospective case control study aims to evaluate the effectiveness of a home oximetry service (implemented in response to extended waiting times for routine PSG) in reducing the time between patient referral and treatment. METHODS Patients undergoing diagnostic sleep evaluation for suspected OSA who utilized the Queensland Children's Hospital screening home oximetry service in the first year since its inception in 2021 (n = 163) were compared to a historical group of patients who underwent PSG in 2018 (n = 311). Parameters compared between the two groups included time from sleep physician review to sleep test, ENT review, and definitive treatment in the form of adenotonsillectomy surgery (or CPAP initiation for those who had already undergone surgery). RESULTS The time from sleep physician review and request of the sleep-related study to ENT surgical treatment was significantly reduced (187 days for the HITH oximetry group vs 359 days for the comparable PSG group; p-value <0.05), and time from sleep study request to the report of results was significantly lower for patients in the oximetry group compared to those in the PSG group (11 days vs 105 days; p-value <0.05). CONCLUSION These results suggest that for children referred to a tertiary sleep center for possible obstructive sleep disordered breathing, a home oximetry service can be effective in assisting sleep evaluation and reducing the time to OSA treatment.
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Affiliation(s)
- Alice Wilson
- Faculty of Medicine, The University of Queensland, Brisbane, Australia.
| | - Chloe Hartnett
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia.
| | - David Kilner
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia.
| | - Kate Davies
- Department of General Medicine, Queensland Children's Hospital, Brisbane, Australia.
| | - Nicola Slee
- Department of Otolaryngology Head and Neck Surgery, Queensland Children's Hospital, Brisbane, Australia.
| | - Jasneek Chawla
- Faculty of Medicine, The University of Queensland, Brisbane, Australia; Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia.
| | - Kartik Iyer
- Faculty of Medicine, The University of Queensland, Brisbane, Australia; QIMR Berghofer Medical Research Institute, Brisbane, Australia.
| | - Ajay Kevat
- Faculty of Medicine, The University of Queensland, Brisbane, Australia; Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia.
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Cooke E, Smith C, Miguel MC, Staton S, Thorpe K, Chawla J. Siblings' experiences of sleep disruption in families with a child with Down syndrome. Sleep Health 2023:S2352-7218(23)00237-1. [PMID: 37973451 DOI: 10.1016/j.sleh.2023.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 09/18/2023] [Accepted: 10/04/2023] [Indexed: 11/19/2023]
Abstract
OBJECTIVE Adverse effects of sleep disruption are identified in parents who live with a child with Down Syndrome (DS), yet there is no research on siblings' experiences. This study addresses this knowledge gap. DESIGN A qualitative research study using semi-structured interviews to understand the experiences of siblings of a child with DS and sleep difficulties from the perspectives of parents and siblings. PARTICIPANTS Eleven siblings aged 5-15 years old, and 11 parents, from 8 families with a child with DS in Australia. METHODS Semi-structured sibling interviews explored what it was like to have a sibling with DS and sleep difficulties; the participant's own sleep; how their sleep affected how they felt during the day; how sleep impacted their family; and advice that they would give to other siblings. Parent interviews included similar topics; here we report on excerpts in which parents reference siblings. Interviews were audio recorded, transcribed verbatim, and analyzed using a reflexive thematic analysis. RESULTS Siblings and parents acknowledge sleep disruption for siblings; yet sleep disruption is normalized, viewed with acceptance and inevitability. Siblings report adverse effects from sleep disruption, view sleep in a relational way, and cope with sleep disruption. Parents can underestimate siblings' sleep disruption and are uncertain whether siblings' symptoms result from sleep disruption or other causes. CONCLUSIONS Siblings of a child with DS experience sleep disruption and may be at risk of developing long-term health problems without focused support.
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Affiliation(s)
- Emma Cooke
- Child Health Research Centre, The University of Queensland, South Brisbane, Australia; Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia.
| | - Caitlin Smith
- Department of Paediatric Respiratory & Sleep Medicine, Queensland Children's Hospital, South Brisbane, Australia
| | - Maria Carmen Miguel
- Child Health Research Centre, The University of Queensland, South Brisbane, Australia
| | - Sally Staton
- Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia
| | - Karen Thorpe
- Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia
| | - Jasneek Chawla
- Child Health Research Centre, The University of Queensland, South Brisbane, Australia; Department of Paediatric Respiratory & Sleep Medicine, Queensland Children's Hospital, South Brisbane, Australia
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Goldsworthy A, Chawla J, Birt J, Baumann O, Gough S. Use of extended reality in sleep health, medicine, and research: a scoping review. Sleep 2023; 46:zsad201. [PMID: 37498981 PMCID: PMC10636250 DOI: 10.1093/sleep/zsad201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 07/04/2023] [Indexed: 07/29/2023] Open
Abstract
STUDY OBJECTIVES This scoping review explores the use of extended reality (virtual, augmented, and mixed reality) within sleep health, sleep medicine, and sleep research. It aims to provide insight into current uses and implementation considerations whilst highlighting directions for future research. METHODS A systematic scoping review was undertaken informed by the preferred reporting items for systematic reviews and meta-analyses for scoping reviews and Johanna Briggs Institute. RESULTS The use of virtual reality (VR) as a research tool in the investigation of areas such as dreaming and memory reactivation is growing. Thirty-one articles were identified in total with 20 utilizing VR to improve sleep as a clinical intervention. CONCLUSIONS Research exploring the utility of VR as a clinical intervention in various patient populations and clinical settings is therefore warranted. Researchers and clinicians should ensure that extended reality interventions are developed based on clinical reasoning and informed by evidence of both sleep medicine and the effects of virtual and augmented reality. Where possible future research should utilize up-to-date technology and reporting frameworks to assist in the translation of research into clinical practice.
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Affiliation(s)
- Adrian Goldsworthy
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Jasneek Chawla
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, South Brisbane, QLD, Australia
- Department of Paediatric Respiratory and Sleep Medicine, Queensland Children’s Hospital, South Brisbane, QLD, Australia
| | - James Birt
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Oliver Baumann
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Suzanne Gough
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
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Lanzlinger D, Kevat A, Collaro A, Poh SH, Pérez WP, Chawla J. Tolerance of polysomnography in children with neurodevelopmental disorders compared to neurotypical peers. J Clin Sleep Med 2023; 19:1625-1631. [PMID: 37185049 PMCID: PMC10476030 DOI: 10.5664/jcsm.10626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 04/19/2023] [Accepted: 04/19/2023] [Indexed: 05/17/2023]
Abstract
STUDY OBJECTIVES Diagnostic polysomnography (PSG) is the gold standard test to evaluate sleep-disordered breathing in children. Little is known about how children with neurodevelopmental disorders (NDD) tolerate electrodes and sensors in PSG compared to neurotypical children. METHODS In this retrospective cohort study of children > 12 months of age who underwent diagnostic PSG at our center from 01/01/2021-30/06/2021, we used sleep technician and physician reports to determine how PSG was tolerated in children with NDD compared to neurotypical children. Subanalyses included tolerance of individual electrodes and sensors and subgroups of NDD (eg, Trisomy 21). RESULTS A total of 132 children with a NDD and 139 neurotypical children underwent diagnostic PSG. The median age of all children was 8 years, 39% were female, and 50% had a sleep disorder identified on PSG, with no significant differences between NDD and neurotypical groups. The most poorly tolerated sensors for all children were the nasal prongs (poorly tolerated in 30% of all children), followed by thermistor (14%) and electroencephalography electrodes (6%). Children with NDD were > 3 times more likely (odds ratio 3.1, 95% confidence interval 1.8-5.3) to experience problems tolerating any study leads than neurotypical children. Subgroup analysis revealed children with Trisomy 21 had the greatest difficulty tolerating PSG set-up and leads. CONCLUSIONS This retrospective study demonstrates that children with neurodevelopmental disorders are less likely to tolerate PSG monitoring than neurotypical children and highlights the need to develop alternative measures for evaluation of sleep disorders in this population. CITATION Lanzlinger D, Kevat A, Collaro A, Poh SH, Pérez WP, Chawla J. Tolerance of polysomnography in children with neurodevelopmental disorders compared to neurotypical peers. J Clin Sleep Med. 2023;19(9):1625-1631.
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Affiliation(s)
- Daniela Lanzlinger
- Child Development Service, Children’s Health Queensland, Brisbane, Australia
| | - Ajay Kevat
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Australia
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Andrew Collaro
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Australia
| | - Siew Hui Poh
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - William Pinzon Pérez
- Queensland Cyber Infrastructure Foundation, The University of Queensland, Brisbane, Australia
| | - Jasneek Chawla
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Australia
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, Australia
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Tanner S, Collaro A, Chawla J. The management of residual OSA post-adenotonsillectomy in children with down syndrome: The experience of a large tertiary sleep service. Sleep Med 2023; 109:158-163. [PMID: 37454605 DOI: 10.1016/j.sleep.2023.06.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 06/06/2023] [Accepted: 06/09/2023] [Indexed: 07/18/2023]
Abstract
INTRODUCTION Obstructive Sleep Apnoea (OSA) is common in children with Down Syndrome (DS). Adenotonsillectomy is regarded as first line treatment for OSA but does not always lead to resolution of symptoms in this group of children. Management of residual OSA is variable with no existing recommendations to guide clinical practice. AIM To describe the experience of a large tertiary sleep service in managing residual OSA in children with DS following upper airway surgery (adenotonsillectomy, adenoidectomy or tonsillectomy). METHODS A retrospective study of children who were under evaluation at the Queensland Children's Hospital sleep medicine department between October 2013 to April 2022 for residual OSA, after upper airway surgery was undertaken. RESULTS 148 children with DS who underwent polysomnography for evaluation of OSA were identified. 100 were included in this study and of these, 77 underwent adenotonsillectomy, 19 adenoidectomy, and 4 tonsillectomy. Post-surgical PSG data of all 100 children showed residual mixed sleep disordered breathing in 68 children. 41 were recommended CPAP following surgery, while 21 underwent further surgery. CONCLUSIONS Residual OSA was confirmed to be highly prevalent in children with DS who had already undergone upper airway surgery for OSA. This study identified that CPAP is possible to establish in most children with DS and can be used to manage residual OSA in this population. Approximately one-third of this group were able to discontinue therapy at a median duration of 18 months, suggesting resolution of disease with time can occur in some children.
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Affiliation(s)
- Sarah Tanner
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Australia.
| | - Andrew Collaro
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Australia; Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia
| | - Jasneek Chawla
- Child Health Research Centre, Faculty of Medicine, The University of Queensland, Australia; Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia
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Goldsworthy A, Chawla J, Baumann O, Birt J, Gough S. Extended Reality Use in Paediatric Intensive Care: A Scoping Review. J Intensive Care Med 2023; 38:856-877. [PMID: 37437084 PMCID: PMC10503262 DOI: 10.1177/08850666231185721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 01/06/2023] [Accepted: 06/16/2023] [Indexed: 07/14/2023]
Abstract
Background: Extended reality (XR) technology such as virtual and augmented reality is increasingly being utilised in paediatric medicine due to its role in medical education and reported positive impacts on outcomes including pain, anxiety, and sleep. To the author's knowledge, no previous reviews investigating the use of XR in paediatric intensive care have been undertaken. Objectives: To scope the use of XR in paediatric intensive care, and assess its barriers to adoption, including safety considerations, cleaning and infection control. Eligibility criteria: All articles of any methodological design discussing the use of XR within paediatric intensive and critical care were included. Sources of evidence: Four databases (EMBASE, CINAHL, PsychInfo, PubMed) and Google Scholar were searched without any limitations on publication year. Charting methods: Data was extracted into Microsoft Excel by two authors independently (AG & SF) and cross-checked for completeness. Results: One hundred and eighty-eight articles were originally identified. Following the application of eligibility criteria 16 articles utilising XR in clinical interventions (n = 7) and medical education (n = 9) were included. Articles utilised VR and AR for highly variable purposes within both medical education (eg disaster preparedness, intubation) and clinical interventions (eg decrease pain, nausea, anxiety and improve Glasgow Coma Scale). Conclusions: While research into the use of XR in paediatric intensive care is still in its infancy it has increased dramatically over the past 5 years within two key areas. Firstly, in healthcare education, to assist in the acquisition of PICU-specific knowledge and practice of skills such as intubation of difficult airways. Secondly, studies have evaluated and demonstrated that with appropriate use, VR appears to be a safe and feasible intervention to decrease pain and anxiety in PICU patients.
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Affiliation(s)
| | - Jasneek Chawla
- Child Health Research Centre, The University of Queensland, South Brisbane, Australia
- Department of Paediatric Respiratory & Sleep Medicine, Queensland Children's Hospital, South Brisbane, Australia
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Iyer KK, Roberts JA, Waak M, Kevat A, Chawla J, Lauronen L, Vanhatalo S, Stevenson NJ. Optimization of time series features to estimate brain age in children from electroencephalography. Annu Int Conf IEEE Eng Med Biol Soc 2023; 2023:1-4. [PMID: 38082782 DOI: 10.1109/embc40787.2023.10340663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Functional brain age measures in children, derived from the electroencephalogram (EEG), offer direct and objective measures in assessing neurodevelopmental status. Here we explored the effectiveness of 32 preselected 'handcrafted' EEG features in predicting brain age in children. These features were benchmarked against a large library of highly comparative multivariate time series features (>7000 features). Results showed that age predictors based on handcrafted EEG features consistently outperformed a generic set of time series features. These findings suggest that optimization of brain age estimation in children benefits from careful preselection of EEG features that are related to age and neurodevelopmental trajectory. This approach shows potential for clinical translation in the future.Clinical Relevance-Handcrafted EEG features provide an accurate functional neurodevelopmental biomarker that tracks brain function maturity in children.
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Cooke E, Coles L, Staton S, Thorpe K, Chawla J. Communicating the complex lives of families that include a child with Down syndrome. Health Sociol Rev 2023; 32:1-23. [PMID: 36748924 DOI: 10.1080/14461242.2022.2161405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 12/18/2022] [Indexed: 06/18/2023]
Abstract
Families of children with Down syndrome experience complex lives and needs, yet the few existing studies on these families are written in conventional academic prose that is not optimal for knowledge translation beyond academia, particularly for busy healthcare professionals. In this paper, we Depart Radically in Academic Writing (DRAW) (Mackinlay, 2022) and present data poetry and two case studies that draw upon semi-structured interviews with mothers, fathers, and siblings, who were interviewed separately about their experiences of having a child/sibling with Down syndrome. We introduce our interdisciplinary team that includes academics and clinicians to contextualise our focus on research translation. We demonstrate that writing with creative criticality (i.e. 'DRAWing') contributes an embodied and affective understanding of research participants' stories, which is largely lacking in the academic literature on families of children with Down syndrome and the sociology of health and illness field more broadly. Moreover, DRAWing can impact audiences emotionally as well as intellectually (Richardson, 2003, p. 924), which has important knowledge translation implications for both healthcare professionals and these families. DRAWing can capture healthcare professionals' attention, prompting them to critically reflect on their practices and opportunities for improving care and treatment for these families.
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Affiliation(s)
- Emma Cooke
- Child Health Research Centre, The University of Queensland, South Brisbane, Australia
- Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia
| | - Laetitia Coles
- Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia
| | - Sally Staton
- Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia
| | - Karen Thorpe
- Queensland Brain Institute, The University of Queensland, Saint Lucia, Australia
| | - Jasneek Chawla
- Child Health Research Centre, The University of Queensland, South Brisbane, Australia
- Department of Paediatric Respiratory & Sleep Medicine, Queensland Children's Hospital, South Brisbane, Australia
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Kevat A, Bernard A, Harris MA, Heussler H, Black R, Cheng A, Waters K, Chawla J. Impact of adenotonsillectomy on growth trajectories in preschool children with mild-moderate obstructive sleep apnea. J Clin Sleep Med 2023; 19:55-62. [PMID: 36004732 PMCID: PMC9806775 DOI: 10.5664/jcsm.10266] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 08/14/2022] [Accepted: 08/17/2022] [Indexed: 01/07/2023]
Abstract
STUDY OBJECTIVES Adenotonsillectomy (AT) forms part of first-line management for pediatric obstructive sleep apnea. In nonrandomized studies of preschool-aged children, postoperative weight gain has been seen following AT, raising concerns regarding later obesity. Using longitudinal data from a multicenter randomized controlled trial, we assessed the impact of AT on growth trajectories in preschool-aged children with mild-moderate obstructive sleep apnea. METHODS A total of 190 children (aged 3-5 years) with obstructive apnea-hypopnea index ≤ 10 events/h were randomly assigned to early (within 2 months) or routine (12-month wait) AT. Anthropometry and polysomnography were performed at baseline, 12-month, and 24-month time points for 126 children. Baseline characteristics were compared using a Mann-Whitney or t test for continuous variables and Fisher's exact test for categorical variables. Longitudinal data underwent linear mixed modeling. RESULTS For body mass index (BMI) z-score there was a significant increase in the early surgery group between 0 and 12 months (0.4, 95% confidence interval 0.1-0.8) but not from 12-24 months. For the routine surgery group there was an identical significant BMI z-score increase in the first 12 months following surgery, ie, between 12- and 24-month time points (0.45, 95% confidence interval 0.1-0.8) but not from 0-12 months (preoperative time). Final BMI z-score was similar between groups. Findings for weight-for-age z-score were similar to the findings for BMI z-score. Height-for-age z-score was not significantly different between different time points or intervention groups. CONCLUSIONS This study provides randomized controlled trial evidence of notable, but time-limited, increase in the BMI and weight of preschool children with mild-moderate obstructive sleep apnea in the months immediately following AT. CLINICAL TRIAL REGISTRATION Registry: Australian New Zealand Clinical Trials Registry; Name: POSTA Child Study (Preschool Obstructive Sleep Apnea Tonsillectomy Adenoidectomy Study); URL: https://anzctr.org.au/Trial/Registration/TrialReview.aspx?id=336273&isReview=true; Identifier: ACTRN12611000021976. CITATION Kevat A, Bernard A, Harris M-A, et al. Impact of adenotonsillectomy on growth trajectories in preschool children with mild-moderate obstructive sleep apnea. J Clin Sleep Med. 2023;19(1):55-62.
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Affiliation(s)
- Ajay Kevat
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Queensland, Australia
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Anne Bernard
- QCIF Bioinformatics, Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia
| | - Margaret-Anne Harris
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Queensland, Australia
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- The Mater Research Institute, University of Queensland, Brisbane, Queensland, Australia
| | - Helen Heussler
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Queensland, Australia
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- The Mater Research Institute, University of Queensland, Brisbane, Queensland, Australia
| | - Robert Black
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- Department of Paediatric Otolaryngology Head and Neck Surgery, Queensland Children’s Hospital, Brisbane, Queensland, Australia
| | - Alan Cheng
- Department of Paediatric Otolaryngology, The Children’s Hospital at Westmead, Sydney, New South Wales, Australia
- Discipline of Child and Adolescent Health, Faculty of Medicine, The University of Sydney, Sydney, New South Wales, Australia
| | - Karen Waters
- Discipline of Child and Adolescent Health, Faculty of Medicine, The University of Sydney, Sydney, New South Wales, Australia
- Department of Sleep Medicine, The Children’s Hospital at Westmead, Sydney, New South Wales, Australia
| | - Jasneek Chawla
- Department of Respiratory and Sleep Medicine, Queensland Children’s Hospital, Brisbane, Queensland, Australia
- Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
- The Mater Research Institute, University of Queensland, Brisbane, Queensland, Australia
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12
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Flint A, August D, Lai M, Chawla J, Ballard E, Davies MW. Determining reference data for overnight oximetry in neonates: A pilot study. Early Hum Dev 2022; 168:105571. [PMID: 35390559 DOI: 10.1016/j.earlhumdev.2022.105571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 03/27/2022] [Accepted: 03/29/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To determine the variability of overnight oximetry parameters in a group of normal, healthy term infants; to enable the calculation of the number of subjects required to produce reliable reference ranges for neonatal overnight oximetry. METHODS A convenience sample of normal, healthy term neonates was recruited. Each had overnight oximetry using the Masimo SET Radical oximeter (data downloaded using Profox software). The report included the number of oxygen desaturation events (an absolute decrease in SpO2 of 4 or more), and the duration of oxygen saturations <90%. RESULTS 21 babies were recruited with data available from 19. 32% were female; 68% born by vaginal delivery; 37% fully breast feeding, 53% bottle and 11% by a combination of both. The mean (SD) GA was 39.2 (0.79) weeks, the mean (SD) BW was 3477 (240) grams. The median (IQR) post-natal age at the time the oximetry recording started was 31 (28-41) hours; four babies were <24 h old. All babies had some desaturation events ranging from 4 to 36 times per hour. On average babies spent 3.0% (SD 2.3) of the time with an SpO2 < 90% (range 0.12-7.94). CONCLUSIONS In a cohort of healthy term neonates, as assessed by overnight oximetry, the mean SpO2 was 97% (SD 1, range 95-99). All neonates had a number of oxygen desaturation events ranging from 4 to 36 per hour. The mean proportion of time spent with oxygen saturations below 90% was around 3%.
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Affiliation(s)
- Anndrea Flint
- Neonatal Unit, Redcliffe Hospital, Redcliffe, Queensland, Australia
| | - Deanne August
- Grantley Stable Neonatal Unit, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia; School of Nursing and Midwifery, Griffith University, Brisbane, Queensland, Australia
| | - Melissa Lai
- Grantley Stable Neonatal Unit, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
| | - Jasneek Chawla
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Queensland, Australia
| | - Emma Ballard
- Statistics Unit, QIMR Berghofer Medical Research Institute, Australia
| | - Mark W Davies
- Grantley Stable Neonatal Unit, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia; School of Clinical Medicine - Royal Brisbane Clinical Unit, University of Queensland, Brisbane, Queensland, Australia.
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13
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Chawla J. How much time is sufficient to achieve hemostasis following dental extraction: Few minutes to many minutes- A randomized controlled trial. Int J Oral Maxillofac Surg 2021. [DOI: 10.1016/j.ijom.2022.03.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Chawla J, Edwards EA, Griffiths AL, Nixon GM, Suresh S, Twiss J, Vandeleur M, Waters KA, Wilson AC, Wilson S, Tai A. Ventilatory support at home for children: A joint position paper from the Thoracic Society of Australia and New Zealand/Australasian Sleep Association. Respirology 2021; 26:920-937. [PMID: 34387937 PMCID: PMC9291882 DOI: 10.1111/resp.14121] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 04/04/2021] [Accepted: 07/05/2021] [Indexed: 11/28/2022]
Abstract
The goal of this position paper on ventilatory support at home for children is to provide expert consensus from Australia and New Zealand on optimal care for children requiring ventilatory support at home, both non-invasive and invasive. It was compiled by members of the Thoracic Society of Australia and New Zealand (TSANZ) and the Australasian Sleep Association (ASA). This document provides recommendations to support the development of improved services for Australian and New Zealand children who require long-term ventilatory support. Issues relevant to providers of equipment and areas of research need are highlighted.
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Affiliation(s)
- Jasneek Chawla
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Queensland, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Elizabeth A Edwards
- New Zealand Respiratory & Sleep Institute, Starship Children's Hospital, Auckland, New Zealand
| | - Amanda L Griffiths
- Respiratory & Sleep Medicine, Royal Children's Hospital, Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,University of Melbourne, Melbourne, Victoria, Australia
| | - Gillian M Nixon
- Melbourne Children's Sleep Centre, Monash Children's Hospital, Melbourne, Victoria, Australia.,Department of Paediatrics, Monash University, Melbourne, Victoria, Australia
| | - Sadasivam Suresh
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Queensland, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Jacob Twiss
- New Zealand Respiratory & Sleep Institute, Starship Children's Hospital, Auckland, New Zealand
| | - Moya Vandeleur
- Respiratory & Sleep Medicine, Royal Children's Hospital, Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Karen A Waters
- Sleep Medicine, The Children's Hospital at Westmead, Sydney, New South Wales, Australia.,University of Sydney, Sydney, New South Wales, Australia
| | - Andrew C Wilson
- Respiratory & Sleep Medicine, Princess Margaret Hospital for Children, Perth, Western Australia, Australia.,School of Paediatrics and Child Health, University of Western Australia, Perth, Western Australia, Australia
| | - Susan Wilson
- Child Youth Mental Health Services, Queensland Children's Hospital, Brisbane, Queensland, Australia
| | - Andrew Tai
- Respiratory & Sleep Medicine, Women's and Children's Hospital, Adelaide, South Australia, Australia.,Robinson Research Institute, University of Adelaide, Adelaide, South Australia, Australia
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15
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Waters KA, Chawla J, Harris MA, Heussler H, Cheng AT, Black RJ. Sleep and Behavior 24 Months After Early Tonsillectomy for Mild OSA: An RCT. Pediatrics 2021; 148:peds.2020-038588. [PMID: 34257146 DOI: 10.1542/peds.2020-038588] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/09/2021] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The Preschool Obstructive Sleep Apnea Tonsillectomy and Adenoidectomy study is a prospective randomized controlled study of children aged 3 to 5 years. This follow-up evaluated postoperative outcomes 24 months after randomization. METHODS Baseline, 12-month, and 24-month assessments included intellectual ability, polysomnography, audiology, a pediatric sleep questionnaire, the parent rating scale of the Behavior Assessment System for Children, and the Behavior Rating Inventory of Executive Functioning. RESULTS In total, 117 (55% male) of 190 children, 61.6% of those initially randomly assigned, attended 24-month follow-up; 62 of 99 were assigned T/A within 2 months (eT/A); and 55 of 91 were assigned to T/A after the 12-month follow-up (T/A12). Intellectual ability, our primary outcome, did not differ according to the timing of T/A. Exploratory analyses revealed changes in both groups after T/A, including fewer children having day sleeps (eT/A from baseline 97% to 11%, T/A12 from 36% at 12 months to 9%), improved symptom scores (eT/A 0.62 to 0.25, T/A12 0.61 to 0.26; P < .001), improved behavior T-scores (eT/A 71.0 to 59.9, T/A12 63.6 to 50.5; P < .001), and improved polysomnography (obstructive apnea-hypopnea index eT/A 1.9 to 0.3 per hour, T/A12 1.3 to 0.3; P < .001). The eT/A group revealed temporary postoperative improvement of Woodcock-Johnson III subscales (sound blending and incomplete word scores) and behavioral withdrawal. CONCLUSIONS T/A for mild obstructive sleep apnea led to large improvements in sleep and behavior in preschool-aged children, regardless of the timing of surgery.
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Affiliation(s)
- Karen A Waters
- Sleep Medicine Service, The Children's Hospital at Westmead, Westmead, Australia .,Specialty of Child and Adolescent Health, School of Medicine, The University of Sydney, Sydney, Australia
| | - Jasneek Chawla
- Departments of Respiratory and Sleep Medicine.,Faculty of Medicine, Mater Medical Research Institute
| | | | - Helen Heussler
- Children's Health Research Centre, The University of Queensland, Brisbane, Australia
| | - Alan T Cheng
- Sleep Medicine Service, The Children's Hospital at Westmead, Westmead, Australia.,Specialty of Child and Adolescent Health, School of Medicine, The University of Sydney, Sydney, Australia
| | - Robert J Black
- Otolaryngology Head and Neck Surgery, Children's Health Queensland Hospital and Health Service, Brisbane, Australia
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16
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Kevat A, Chawla J, Bernard A, Harris MA, Heussler H, Black R, Waters K. 552 Impact of Adenotonsillectomy on Growth Trajectories in Preschool Children with Mild Obstructive Sleep Apnea. Sleep 2021. [DOI: 10.1093/sleep/zsab072.550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Adenotonsillectomy forms part of first-line management for pediatric obstructive sleep apnea (OSA). In nonrandomized studies of preschool-aged children, it is associated with postoperative weight gain. Being overweight or obese in childhood is a predictor of cardiovascular and metabolic disease in later life. Using longitudinal data from a multicenter randomised controlled trial, we assessed the impact of adenotonsillectomy on growth trajectory in preschool-aged children with mild-moderate OSA. Secondary aims were to assess the influence of social factors and baseline polysomnography parameters on growth trajectory.
Methods
A total of 190 children (aged 3–5 years) with obstructive apnea hypopnea index ≤10 were randomly assigned to early (within 2 months) or routine (12-month wait) adenotonsillectomy. Anthropometry and polysomnography were performed at baseline, 12-month and 24-month timepoints for 126 children. Social risk factors were recorded using a questionnaire. Baseline characteristics were compared using a Mann-Whitney or t-test for continuous variables, and Fisher’s exact test for categorical variables. Data were analyzed using linear mixed modelling.
Results
Demographic and polysomnographic parameters were similar between groups at baseline. Baseline body mass index (BMI) z-score was 0.52 for both groups. For BMI z-score, there was a significant increase in the early surgery group between 0 and 12 months (0.4, 95%CI 0.1–0.8) but not from 12–24 months. For the routine surgery group, there was a significant BMI z-score increase following surgery between 12 and 24 months (0.45, 95%CI 0.1–0.8), but not from 0–12 months. Final BMI z-score was similar between the two groups. Findings for weight-for-age z-score were similar to the abovementioned findings for BMI z-score. Height-for-age z-score was not significantly different between different timepoints or intervention groups. Children with an unemployed primary income earner had a higher BMI z-score than those with a full-time employed income earner. No other social risk or polysomnography parameters were statistically significant.
Conclusion
This study provides randomized controlled trial evidence of notable weight increase in preschool children with milder spectrum OSA that occurs in the months immediately following adenotonsillectomy. For children undergoing adenotonsillectomy, counselling regarding nutritional intake and exercise alongside weight monitoring should be considered, especially for those already at risk of becoming overweight or obese.
Support (if any):
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17
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Wong MD, Neylan M, Williams G, Zahir SF, Chawla J. Predictors of home oxygen duration in chronic neonatal lung disease. Pediatr Pulmonol 2021; 56:992-999. [PMID: 33621433 DOI: 10.1002/ppul.25257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 12/24/2020] [Accepted: 12/29/2020] [Indexed: 11/07/2022]
Abstract
AIMS In infants with chronic neonatal lung disease (CNLD), we aimed to identify predictors of home oxygen duration, predictors of discharge oxygen flow rates, and the association of oxygen flow rates with respiratory outcomes. METHODS Infants with CNLD requiring home oxygen in 2016 and 2017 were retrospectively reviewed. Hazard ratios (HR) were estimated from Cox proportional hazards regression models in the cohort. A multinomial logistic regression model examined the effects of maternal and infant variables on discharge oxygen flow rates. Kruskal-Wallis test with univariate linear regression and Fisher's exact test with binomial univariate logistic regression were used to examine associations between oxygen flow groups and post-discharge clinical variables. RESULTS One hundred and forty-nine infants were included. Median corrected gestational age (CGA) at oxygen cessation was 6.8 months (interquartile range, 4.4) with 87.2% of infants weaned by 12 months CGA. Shorter initial neonatal intensive care unit (NICU) stay predicted faster oxygen weaning at 9 months (HR, 0.99; 95% confidence interval [CI], 0.98-1.00, p = .02) and 12 months (HR, 0.99; 95% CI, 0.98-1.00, p = .02). Infants with hypercarbia at discharge or discharged from NICU at higher CGA had higher odds of requiring ≥ 200 ml/min relative to ≤ 125 ml/min oxygen. Infants discharged with > 250 ml/min oxygen were more likely to have a respiratory-related admission before 2 years chronological age. CONCLUSION Shorter initial NICU stay was the best predictor of earlier home oxygen cessation. At NICU discharge, infants with hypercarbia or a higher CGA may require more home oxygen and experience more respiratory-related hospital admission in the first 2 years of chronological age.
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Affiliation(s)
- Matthew D Wong
- Pediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, South Brisbane, Queensland, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Melissa Neylan
- Pediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, South Brisbane, Queensland, Australia
| | - Gordon Williams
- Pediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, South Brisbane, Queensland, Australia
| | - Syeda F Zahir
- QCIF Facility for Advanced Bioinformatics, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Jasneek Chawla
- Pediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, South Brisbane, Queensland, Australia.,School of Clinical Medicine, University of Queensland, Brisbane, Queensland, Australia
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18
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Waters KA, Castro C, Chawla J. The spectrum of obstructive sleep apnea in infants and children with Down Syndrome. Int J Pediatr Otorhinolaryngol 2020; 129:109763. [PMID: 31704574 DOI: 10.1016/j.ijporl.2019.109763] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 10/29/2019] [Indexed: 01/09/2023]
Abstract
OBJECTIVE Describe the spectrum of OSA across time in infants and children with Down syndrome. METHODS Retrospective records review of children who underwent formal polysomnography (PSG) in one of two Australian tertiary sleep centres over selected 3.5-year periods. 152 children were identified, then all sleep study and treatment records were retrieved for the lifetime of the child through 2018. RESULTS 3.8 ± 3.2 studies (range 1-17) were retrieved per child and 38.2% had mild disease at worst. Children having only 1 study were more likely to have a normal or mild result than those having ≥2 (chi-square 11.25, p-value 0.0008) Studies were more often severe in children age <2 compared to those ≥2 years, (chi-square 12.87, p = 0.005). After age 2 years, OSA severity increased with age. Amongst 91 (56.4%) children with ≥2 studies, 71 (78.0%) had moderate or severe disease at some time. Studies evaluating the effects of surgery (most often adenotonsillectomy) showed resolution of disease to mild or normal in 53.3%. Where ≥2 studies were evaluated, the last study polarised towards normal or mild disease 40 (44.0%), or treatment titrations 34 (37.4%) with moderate or severe disease in 17 (18.7%). CONCLUSIONS In a tertiary sleep unit, a full spectrum of sleep disordered breathing in Down syndrome was seen from infancy onwards. Children having only one study were more likely to have normal results. Children with multiple studies reflected disease surveillance, including follow-up after treatment interventions.
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Affiliation(s)
- Karen A Waters
- Department of Sleep Medicine, The Children's Hospital at Westmead, SIDS and Sleep Apnoea Research, Discipline of Child and Adolescent Health, School of Medicine, University of Sydney, Australia; Department of Sleep Medicine, The Children's Hospital at Westmead, Australia.
| | - Chenda Castro
- Department of Sleep Medicine, The Children's Hospital at Westmead, SIDS and Sleep Apnoea Research, Discipline of Child and Adolescent Health, School of Medicine, University of Sydney, Australia
| | - Jasneek Chawla
- Department of Sleep Medicine, The Children's Hospital at Westmead, Paediatric Respiratory & Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia; Department of Sleep Medicine, The Children's Hospital at Westmead, Faculty of Medicine, Mater Medical Research Institute, The University of Queensland, Australia
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19
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Wong MD, Chung H, Chawla J. Using continuous overnight pulse oximetry to guide home oxygen therapy in chronic neonatal lung disease. J Paediatr Child Health 2020; 56:309-316. [PMID: 31464352 DOI: 10.1111/jpc.14606] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 08/07/2019] [Accepted: 08/08/2019] [Indexed: 11/27/2022]
Abstract
AIM The aims of this study are: (i) to survey the knowledge of paediatric clinicians using overnight continuous pulse oximetry data to guide management of infants with chronic neonatal lung disease (CNLD); (ii) to assess the ability of paediatric clinicians to interpret overnight continuous pulse oximetry data; and (iii) to describe the overnight oximetry interpretation practices of paediatric respiratory specialists. METHODS Paediatric clinicians from three tertiary teaching hospitals completed an anonymous survey regarding overnight continuous pulse oximetry in chronic neonatal lung disease. Using a modified Delphi technique, paediatric respiratory specialists participated in a concordance exercise and discussions to establish consensus interpretations for 25 oximetry studies. Paediatric clinicians were invited to complete the same exercise as a comparison. RESULTS Self-rated knowledge from 74 surveyed clinicians was proportional to clinical experience. Twenty paediatric clinicians and nine paediatric respiratory specialists completed the oximetry exercise with scores of 64% (κ = 0.25) and 80% (κ = 0.45), respectively. Individual parameters like a mean peripheral arterial haemoglobin saturation (SpO2 ) below 93% and percentage time spent below SpO2 93% correlated poorly with the consensus interpretations. Paediatric respiratory specialists instead relied on visual analysis of SpO2 waveforms, utilising the frequency and depth of desaturations to guide management. CONCLUSION Interpretation of overnight oximetry data is variable amongst both paediatric clinicians and respiratory specialists. This likely reflects inadequate evidence defining clinically significant intermittent hypoxaemia, whether in terms of desaturation duration, frequency or nadir.
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Affiliation(s)
- Matthew D Wong
- Department of Paediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Queensland, Australia.,School of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Hinfan Chung
- School of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Jasneek Chawla
- Department of Paediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Queensland, Australia.,School of Medicine, University of Queensland, Brisbane, Queensland, Australia
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20
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Waters KA, Chawla J, Harris MA, Heussler H, Black RJ, Cheng AT, Lushington K. Cognition After Early Tonsillectomy for Mild OSA. Pediatrics 2020; 145:peds.2019-1450. [PMID: 31919049 DOI: 10.1542/peds.2019-1450] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/31/2019] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES It remains uncertain whether treatment with adenotonsillectomy for obstructive sleep apnea in children improves cognitive function. The Preschool Obstructive Sleep Apnea Tonsillectomy and Adenoidectomy study was a prospective randomized controlled study in which researchers evaluated outcomes 12 months after adenotonsillectomy compared with no surgery in preschool children symptomatic for obstructive sleep apnea. METHODS A total of 190 children (age 3-5 years) were randomly assigned to early adenotonsillectomy (within 2 months) or to routine wait lists (12-month wait, no adenotonsillectomy [NoAT]). Baseline and 12-month assessments included cognitive and behavioral testing, medical assessment, polysomnography, and audiology. The primary outcome was global IQ at 12-month follow-up, measured by the Woodcock Johnson III Brief Intellectual Ability (BIA). Questionnaires included the Pediatric Sleep Questionnaire, Parent Rating Scale of the Behavioral Assessment System for Children-II, and Behavior Rating Inventory of Executive Function, Preschool Version. RESULTS A total of 141 children (75.8%) attended baseline and 12-month assessments, and BIA was obtained at baseline and 12-month follow-up for 61 and 60 participants in the adenotonsillectomy versus NoAT groups, respectively. No cognitive gain was found after adenotonsillectomy compared with NoAT, adjusted for baseline; BIA scores at 12-month follow-up were as follows: adenotonsillectomy, 465.46 (17.9) versus NoAT, 463.12 (16.6) (mean [SD]). Improvements were seen for polysomnogram arousals and apnea indices and for parent reports of symptoms (Pediatric Sleep Questionnaire), behavior (Behavior Assessment System for Children behavioral symptoms, P = .04), overall health, and daytime napping. CONCLUSIONS Structured testing showed no treatment-attributable improvement in cognitive functioning of preschool children 12 months after adenotonsillectomy compared with NoAT. Improvements were seen after adenotonsillectomy in sleep and behavior by using polysomnogram monitoring and parental questionnaires.
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Affiliation(s)
- Karen A Waters
- Department of Sleep Medicine, The Children's Hospital at Westmead, Westmead, Australia; .,Discipline of Child and Adolescent Health, Faculty of Medicine, The University of Sydney, Sydney, Australia
| | - Jasneek Chawla
- Department of Paediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia.,Mater Medical Research Institute, Faculty of Medicine and
| | - Margaret-Anne Harris
- Department of Paediatric Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, Australia
| | - Helen Heussler
- Centre for Children's Health Research, The University of Queensland, Brisbane, Australia
| | - Robert J Black
- Department of Paediatric Otolaryngology Head and Neck Surgery, Children's Health Queensland, South Brisbane, Australia; and
| | - Alan T Cheng
- Department of Sleep Medicine, The Children's Hospital at Westmead, Westmead, Australia.,Discipline of Child and Adolescent Health, Faculty of Medicine, The University of Sydney, Sydney, Australia
| | - Kurt Lushington
- School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
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21
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Chawla J, Burgess S, Heussler H. Behavioural problems, functional ability and cognitive function in children with down syndrome and sleep problems. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Twiss J, Chawla J, Davey MJ, Edwards EA, Elder D, Francis A, Griffiths MA, Pamula Y, Suresh S, Verginis N, Nixon GM. Overnight oximetry for evaluating paediatric obstructive sleep apnoea: Technical specifications and interpretation guidelines. J Paediatr Child Health 2019; 55:1279. [PMID: 31629377 DOI: 10.1111/jpc.14586] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 07/21/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Jacob Twiss
- Respiratory Department, Starship Children's Hospital, Auckland, New Zealand
| | - Jasneek Chawla
- Department of Respiratory and Sleep Medicine Children's Health Queensland Hospital and Health Service, Queensland Children's Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, Queensland University, Brisbane, Queensland, Australia
| | - Margot J Davey
- Department of Paediatrics Monash University Melbourne Children's Sleep Centre, Monash Children's Hospital, Melbourne, Victoria, Australia
| | | | - Dawn Elder
- Department of Paediatrics and Child Health, Otago University, Wellington, New Zealand
| | - Alana Francis
- Department of Respiratory and Sleep Medicine, Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Mandie A Griffiths
- Department of Respiratory and Sleep Medicine, Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Yvonne Pamula
- Department of Respiratory and Sleep Medicine, Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Sadasivam Suresh
- Department of Respiratory and Sleep Medicine Children's Health Queensland Hospital and Health Service, Queensland Children's Hospital, Brisbane, Queensland, Australia
| | - Nicola Verginis
- Department of Paediatrics Monash University Melbourne Children's Sleep Centre, Monash Children's Hospital, Melbourne, Victoria, Australia
| | - Gillian M Nixon
- Department of Paediatrics Monash University Melbourne Children's Sleep Centre, Monash Children's Hospital, Melbourne, Victoria, Australia
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Kaul S, Kaur H, Vats SKS, Chawla J, Jindal R, Khetarpal P. Identification of novel translocation between short arm of chromosome 4 and long arm of chromosome 6 in an infertile man using Interphase Chromosome Profiling (ICP). Andrologia 2018; 50:e12954. [PMID: 29411892 DOI: 10.1111/and.12954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/15/2017] [Indexed: 11/27/2022] Open
Abstract
Conventional cytogenetics has always been a favourite to detect chromosomal aberrations. Carriers of chromosomal translocation are often phenotypically normal but are infertile. Couples are often advised to go for karyotyping, but culture failure or improper metaphase spread with poor banding often makes the analysis difficult. We report here a novel translocation between short arm of chromosome 4 and long arm of chromosome 6 in an infertile man using an advanced molecular cytogenetic technique of Interphase Chromosome Profiling (ICP).
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Affiliation(s)
- S Kaul
- Centre for Human Genetics and Molecular Medicine, School of Health Science, Central University of Punjab, Bathinda, India
| | - H Kaur
- Adesh University, Bathinda, India
| | - S K S Vats
- Dss Imagetech Pvt. ltd, New Delhi, India
| | - J Chawla
- Jindal Heart Hospital, Jindal heart institute and IVF centre, Bathinda, India
| | - R Jindal
- Jindal Heart Hospital, Jindal heart institute and IVF centre, Bathinda, India
| | - P Khetarpal
- Centre for Human Genetics and Molecular Medicine, School of Health Science, Central University of Punjab, Bathinda, India
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Waters KA, Chawla J, Harris MA, Dakin C, Heussler H, Black R, Cheng A, Burns H, Kennedy JD, Lushington K. Rationale for and design of the "POSTA" study: Evaluation of neurocognitive outcomes after immediate adenotonsillectomy compared to watchful waiting in preschool children. BMC Pediatr 2017; 17:47. [PMID: 28152984 PMCID: PMC5290671 DOI: 10.1186/s12887-016-0758-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 12/09/2016] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND IQ deficits are linked to even mild obstructive sleep apnoea (OSA) in children. Although OSA is commonly first diagnosed in the pre-school age group, a randomised trial is still needed to assess IQ outcomes after adenotonsillectomy in the pre-school age-group. This randomised control trial (RCT) will primarily determine whether adenotonsillectomy improves IQ compared to no adenotonsillectomy after 12 months, in preschool (3-5 year-old) children with mild to moderate OSA. METHODS This protocol is for an ongoing multi-centred RCT with a recruitment target of 210 subjects (105 in each arm). Children age 3-5 years with symptoms of OSA, are recruited through doctor referral, at the point of referral to the Ear Nose and Throat (ENT) services. Screening is initially with a questionnaire (Paediatric Sleep Questionnaire, PSQ) for symptoms of obstructive sleep apnoea (OSA). Where questionnaires are positive (suggestive of OSA) and ENT surgeons recommend them for adenotonsillectomy, they are invited to participate in POSTA. Baseline testing includes neurocognitive testing (IQ and psychometric evaluation with the neuropsychologist blinded to randomisation) and overnight polysomnography (PSG). Where the Obstructive Apnoea-Hypopnea Index (OAHI) from the PSG is <10/h per hour, consent for randomisation is sought; children with severe OSA (OAHI ≥ 10/h) are sent for immediate treatment and excluded from the study. After consent is obtained, participants are randomised to early surgery (within 2 months) or to surgery after a usual wait time of 12 months. Follow-up studies include repeat neurocognitive testing and PSG at 12 (with the waiting list group studied before their surgery) and 24 months after randomisation. Analysis will be by intention to treat. The primary outcome is IQ at 12 months' follow-up. DISCUSSION If IQ deficits associated with OSA are reversible 12 months after adenotonsillectomy compared to controls, future clinical practice advise would be to undertake early surgery in young children with OSA. The study could provide data on whether a window of opportunity exists for reversing IQ deficits linked to OSA in the pre-school age-group. TRIAL REGISTRATION Australian and New Zealand Clinical Trials Registration Number ACTRN12611000021976 .
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Affiliation(s)
- Karen A Waters
- The Children's Hospital at Westmead, Sydney, NSW, 2145, Australia. .,The University of Sydney, Sydney, Australia.
| | - Jasneek Chawla
- The Lady Cilento Children's Hospital, Brisbane, Australia.,The Mater Research Institute - The University of Queensland, Queensland, Australia
| | - Margaret-Anne Harris
- The Lady Cilento Children's Hospital, Brisbane, Australia.,The Mater Research Institute - The University of Queensland, Queensland, Australia
| | - Carolyn Dakin
- The Mater Research Institute - The University of Queensland, Queensland, Australia
| | - Helen Heussler
- The Lady Cilento Children's Hospital, Brisbane, Australia.,The Mater Research Institute - The University of Queensland, Queensland, Australia
| | - Robert Black
- The Lady Cilento Children's Hospital, Brisbane, Australia.,The Mater Research Institute - The University of Queensland, Queensland, Australia
| | - Alan Cheng
- The Children's Hospital at Westmead, Sydney, NSW, 2145, Australia
| | - Hannah Burns
- The Lady Cilento Children's Hospital, Brisbane, Australia.,The Mater Research Institute - The University of Queensland, Queensland, Australia
| | - John D Kennedy
- Women and Children's Hospital, Adelaide, Australia.,The University of South Australia, Adelaide, Australia
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Hines EJ, Walsh M, Armes JE, Douglas T, Chawla J. Interstitial lung disease in infancy: A general approach. J Paediatr Child Health 2016; 52:370-6. [PMID: 27145498 DOI: 10.1111/jpc.13162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 02/04/2016] [Indexed: 01/13/2023]
Abstract
Childhood Interstitial lung disease (chILD) is an umbrella term used to define a broad range of rare, diffuse pulmonary disorders with altered interstitial structure that leads to abnormal gas exchange. Presentation of chILD in infancy can be difficult to differentiate from other common causes of diffuse lung disease. This article aimed at paediatricians provides an overview of interstitial lung disease presenting in infancy and includes key clinical features, a suggested approach to investigation and a summary of management. An overview of three clinical cases has been included to demonstrate the diagnostic approach, characteristic investigation findings and varied clinical outcomes.
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Affiliation(s)
- Erica J Hines
- Department of Paediatrics, Gold Coast University Hospital, Queensland, Australia.,Griffith University, School of Medicine, Queensland, Australia
| | - Mark Walsh
- Department of Medical Imaging, Lady Cilento Children's Hospital, South Brisbane, Queensland, Australia
| | - Jane E Armes
- Department of Anatomical Pathology, Mater Health Services, South Brisbane, Queensland, Australia.,Mater Research Institute, University of Queensland (MRI-UQ), South Brisbane, Queensland, Australia
| | - Tonia Douglas
- Department of Paediatric Respiratory and Sleep Medicine, Lady Cilento Children's Hospital, Brisbane, Queensland, Australia.,Telethon Institute of Child Health Research (TICHR), Perth, Western Australia, Australia
| | - Jasneek Chawla
- Mater Research Institute, University of Queensland (MRI-UQ), South Brisbane, Queensland, Australia.,Department of Paediatric Respiratory and Sleep Medicine, Lady Cilento Children's Hospital, Brisbane, Queensland, Australia
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Chawla J, Waters KA. Snoring in children. J Paediatr Child Health 2015; 51:847-50; quiz 850-1. [PMID: 26333074 DOI: 10.1111/jpc.12976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/25/2015] [Indexed: 11/30/2022]
Abstract
Chronic snoring (≥4 nights per week) is not benign. Otherwise healthy children with chronic snoring and evidence of adenotonsillar hypertrophy can be referred directly for adenotonsillectomy. Snoring children <30 months or with significant medical comorbidities should be referred for specialist sleep evaluation. Older children with intermittent snoring or without significant medical comorbidities can be managed with a combination of medical and surgical interventions listed herein.
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Affiliation(s)
- Jasneek Chawla
- Paediatric Respiratory and Sleep Medicine, Lady Cilento Children's Hospital, Brisbane, Queensland, Australia.,Mater Research Institute, University of Queensland, Brisbane, Queensland, Australia
| | - Karen Ann Waters
- Paediatric Respiratory & Sleep Medicine, Children's Hospital at Westmead, Sydney, New South Wales, Australia.,University of Sydney, Sydney, New South Wales, Australia
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Fall A, Chawla J. 269 Oral vitamin D2 supplementation in children with cystic fibrosis makes a relatively small contribution to total serum 25OH vitamin D levels. J Cyst Fibros 2012. [DOI: 10.1016/s1569-1993(12)60438-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chawla J, Seear M, Zhang T, Smith A, Carleton B. Fifty years of pediatric asthma in developed countries: how reliable are the basic data sources? Pediatr Pulmonol 2012; 47:211-9. [PMID: 21905263 DOI: 10.1002/ppul.21537] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 07/13/2011] [Indexed: 11/08/2022]
Abstract
Given the difficulties in diagnosing, or even defining, asthma in children, claims of a pediatric asthma epidemic in Canada and other developed countries are accepted with surprisingly little critical examination. We reviewed a broad range of data sources to understand how the epidemic evolved during the last 50 years and also to assess the reliability of the conclusions drawn from that data. We obtained Canadian National and Provincial data from Statistics Canada National Population Health Survey, and the British Columbia Ministry of Health respiratory database. International data were obtained by extensive review of pediatric asthma epidemiological surveys published during the last 50 years. In many developed countries, there have been three separate epidemics involving different aspects of pediatric asthma during the last 50 years: a double peaked mortality epidemic (1960s and 1980s), a hospital admission epidemic (peaked around 1990) and a steadily growing epidemic of children who report asthmatic symptoms on questionnaires. Canadian pediatric rates for asthma mortality (1-2/million/year) and hospital admission (1-2/thousand/year) are low and have fallen for the last 20 years. Rates based on questionnaire studies are high (10-15/hundred) and rose steadily over the same period. Objective reductions in asthma deaths and hospital admission likely reflect improved education and treatment programmes. Current claims of an epidemic based largely on subjective self-reported symptoms require more careful analysis. The possibility that symptom misperception, disease fashions, and poor recall, may be part of the explanation for the current high levels of self-reported symptoms deserves more attention.
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Affiliation(s)
- Jasneek Chawla
- Division of Respiratory Medicine, British Columbia's Children's Hospital, Vancouver, British Columbia, Canada
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29
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Dewan M, Chawla J, Thaman D, Chatrath R. Arteriovenous malformation of head and neck region. Int J Oral Maxillofac Surg 2009. [DOI: 10.1016/j.ijom.2009.03.469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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30
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Chawla J, Ramirez-Zamora A, Morales-Vidal S. 102. Paraneoplastic myasthenia gravis and multifocal motor neuropathy with lung cancer. Clin Neurophysiol 2009. [DOI: 10.1016/j.clinph.2008.10.120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Fisher MA, Chawla J, Webber CL. Deterministic recurrences of sequential F-wave latencies. Neurol Neurophysiol Neurosci 2006:8. [PMID: 17260085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Accepted: 01/12/2007] [Indexed: 05/13/2023]
Abstract
PURPOSE Historically, F-waves have been classified by various linear descriptors like persistence, latency, duration, amplitude, chrono-dispersion and number of repeater waves. But because physiological signals are notoriously nonlinear in nature, the objective of this study was to apply modern nonlinear methodology to F-waves sequences to assess the presence of underlying deterministic structures. Subtle changes in these sensitive markers could give early warnings for neurological problems. METHODS F-waves were elicited in the left abductor pollicis breivs muscle by supra-maximally stimulating the median nerve percutaneously at the wrist. Approximately 200 stimuli were applied (0.5 Hz) to three subjects for at least four trials each. F-wave latencies were measured and assembled into sequences in proper order. Recurrence quantification analysis (RQA) was applied to these F-wave sequences from different dimensional perspectives. Controls were constructed by randomly shuffling the ordered sequences. RQA has a theoretical mathematical foundation and practical performance record on numerous other physiological systems. RESULTS Recurrence analysis showed that sequential F-waves form recurrent patterns with parallel trajectories with deterministic and laminated structures. These features could be destroyed by randomizing the sequential orders of F-waves, upholding the hypothesis that sequences of F-waves are deterministically formed from underlying physiological rules. CONCLUSIONS F-wave time series are fully amenable to recurrence analysis which provides a higher-dimensional perspective on the physiological dynamic. The recurrent patterns are complex, but not random, meaning that physiological rules dominate the sequence of F-waves. Disease processes within the central or peripheral nervous system may alter F-wave patterns. If so, RQA potentially may be a diagnostic tool to help discern subtleties between altered deterministic rules operating in disease.
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Wilson J, Chawla J, Fisher M. Sensitivity and specificity of electrodiagnostic criteria for CIDP using ROC curves: comparison to patients with diabetic and MGUS associated neuropathies. J Neurol Sci 2005; 231:19-28. [PMID: 15792816 DOI: 10.1016/j.jns.2004.12.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2004] [Revised: 09/24/2004] [Accepted: 12/10/2004] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Electrodiagnostic testing plays a key role in the characterization of neuropathies. To this end, sets of electrodiagnostic criteria have been proposed to define chronic inflammatory demyelinating polyneuropathy (CIDP). These criteria sets differ because of the number of data points within the sets, the number of required abnormal measures within a criterion, and the cutoff value of each measure. OBJECTIVE To evaluate the sensitivity and specificity of the published criteria for defining CIDP in comparison to diabetic polyneuropathy (DMPN) and monoclonal gammopathy of undetermined significance associated neuropathies (MGUS-PN). DESIGN/METHODS Electrodiagnostic studies of 21 patients with biopsy proven CIDP, 35 patients with MGUS-PN, and 82 patients with DMPN were analyzed. Data were compared against 4 different published criteria sets. Receiver operator characteristic (ROC) curves were used to determine the ideal threshold values for individual electrodiagnostic parameters. RESULTS/CONCLUSION None of the currently published criteria sets could adequately separate CIDP from DMPN and MGUS-PN. Analysis of our data using ROC curves shows that the best discrimination was achieved using the following criteria: (1) FWL>145%ULN in one nerve or 110%ULN in two nerves in separate nerve roots. (2) Motor CV<90%LLN in four nerves with at least one nerve <70%LLN. Furthermore, proximal-to-distal amplitude ratio alone is not adequate to define conduction block. Although electrodiagnostic studies are important for evaluating CIDP, these studies by themselves cannot be used to define this neuropathy.
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Affiliation(s)
- J Wilson
- Hines VAH, Department of Neurology, Loyola University Chicago Medical Center, Nines, Illinois 60141, USA.
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Chawla J. 19 EDUCATION IN VENOUS STASIS EDEMA FOR THE ELDERLY POPULATION OF CATHLAMET, WA. J Investig Med 2004. [DOI: 10.1136/jim-52-suppl1-19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Nirala AP, Vatsal DK, Husain M, Gupta C, Chawla J, Kumar V, Thamman D, Agarwal A. Percutaneous vertebroplasty: an experience of 31 procedures. Neurol India 2003; 51:490-2. [PMID: 14742929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
A prospective study of 31 percutaneous vertebroplasty procedures (PVP) in 22 patients treated during January 2000 to December 2001 is presented. PVP was performed using polymethylmethacrylate (PMMA) to treat vertebral collapse due to osteoporosis and vertebral metastasis, to obtain analgesia and spinal stabilization. We analyze the efficacy and complications related to the procedure. PVP is a safe, effective and a daycare surgery. It can be performed under local anesthesia and has minimal and manageable complications.
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Affiliation(s)
- A P Nirala
- Department of Neurosurgery, KG's Medical College, Lucknow-226003, India
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35
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Meehan KR, Wu A, Hassan R, Miao Y, Chawla J, Slack R, Gehan E, Herscowitz HB. Ex Vivo Cytokine Activation of Peripheral Blood Stem Cells: A Potential Role for Adoptive Cellular Immunotherapy. ACTA ACUST UNITED AC 2001; 10:283-90. [PMID: 11359675 DOI: 10.1089/15258160151135006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Ex vivo activation of peripheral blood stem cells (PBSC) using interleukin-2 (IL-2) results in cytotoxic effector cells that may possess beneficial in vivo effects. We proposed to evaluate ex vivo stimulation of PBSC using various cytokines alone or in combination to optimize their function. Cytokine-activated PBSC were analyzed for tumor-directed cytotoxicity and their ability to remove tumor cells from long-term clonogenic assays. Mononuclear cells were obtained from the apheresis products of normal donors and cultured with IL-2 (1000 U/ml), interferon-alpha (IFN-alpha) (1000 U/ml), or IL-12 (50 U/ml) either alone or in combinations at 37 degrees C and 5% CO(2) for 24 h. Colony-forming unit-tumor (CFUT) assays were initiated using cytokine-activated PBSC with varying concentrations of MCF-7 or SKBR-3 human breast cancer cells. Standard 4-h (51)Cr-release assays were performed with cytokine-activated PBSC using MCF-7 or SKBR-3 cells as targets. Activation of PBSC with IL-2, IFN-alpha, or IL-12 resulted in enhanced cytotoxicity against the two breast cancer cell lines when compared to controls. PBSC activated with IL-2 and IFN-alpha or IL-2 and IL-12 were more cytotoxic than PBSC activated with single cytokines (p = 0.0004 for MCF-7 cells and p < 0.001 for SKBR-3 cells). Using clonogenic assays, IL-2-activated PBSC reduced the number of CFU-T to a greater extent than did IL-12 or IFN-alpha-activated PBSC (p = 0.0006). However, PBSC activated with a combination of IL-2 and IFN-alpha or IL-2 and IL-12 demonstrated 95% and 90% reductions, respectively, compared to 79% reduction using IL-2-activated PBSC (p < 0.0001). The greatest reduction in cytotoxicity occurred in the cell populations depleted of CD56(+) cells (p = 0.016) and CD8(+) CD56(+) cells (p = 0.002), suggesting that the effector cell population includes a combination of cytotoxic CD8(+) T cells and CD56(+) natural killer cells. These results demonstrate that the ex vivo activation of PBSC with cytokines, either alone or in combination, enhances cytotoxicity against, and removal of two human breast cancer cells. The combinations of IL-2 with IFN-alpha or IL-12 are most beneficial in cytotoxicity and purging assays. These results could play an important role in designing adoptive cellular immunotherapy clinical trials in the autologous hematopoietic stem cell transplant setting.
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Affiliation(s)
- K R Meehan
- Division of Hematology and Oncology, the Bone Marrow Transplant Program, Georgetown University Medical Center, Vincent T. Lombardi Cancer Center, Washington, D.C. 20007, USA.
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Chawla J. Reaching consensus, discovering allies, finding tools. Midwifery Today Int Midwife 2001:10. [PMID: 11189607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- J Chawla
- Motherhood and Traditional Resources, Information, Knowledge and Action, 120 Sundernagar, New Delhi, 110003, India.
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Chawla J. Hawa Gola and mother-in-law's big toe. Midwifery Today Int Midwife 2001:54-9. [PMID: 11051991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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Verma UN, van den Blink B, Pillai R, Chawla J, Mazumder A, Herscowitz HB, Meehan KR. Paclitaxel vs cyclophosphamide in peripheral blood stem cell mobilization: comparative studies in a murine model. Exp Hematol 1999; 27:553-60. [PMID: 10089919 DOI: 10.1016/s0301-472x(98)00044-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Paclitaxel is a promising drug for the treatment of breast and ovarian cancer. It also may play a role in mobilization of peripheral blood stem cells (PBSC), as an alternative to cyclophosphamide (Cy). We investigated the PBSC-mobilizing potential of paclitaxel compared to Cy in a murine model. C57B1/6 mice were primed with intraperitoneal injections of Cy (200 mg/kg) or paclitaxel (60 mg/kg) and were sacrificed 4, 6, 8, or 10 days later. Spleens were harvested and processed to obtain low-density mononuclear cells that were used as PBSC. The number of hematopoietic progenitors (CFU-C) on day 4 was significantly higher in the paclitaxel group when compared to mice receiving Cy (72.0 +/- 1.8 vs 9.8 +/- 2.8, p < 0.001). By day 6, CFU-C became significantly higher in the Cy-treated group compared to the paclitaxel-treated group (195.6 +/- 31.9 vs 95.8 +/- 20.7, p < 0.05) and this trend was maintained. However, the total number of CFU-C recovered per spleen was greater in the paclitaxel-treated group (1.27 x 10(5) +/- 0.53 x 10(5) vs 1.06 x 10(5) +/- 0.36 x 10(5), NS). In contrast to paclitaxel, mobilization with Cy was associated with marked perturbation in the proportion of lymphoid cell subsets in the PBSC population along with functional impairment of lymphocytes. After 24 hours of in vitro IL-2 activation, the cytotoxic effector cell function of the Cy-mobilized PBSC population was lower than that of paclitaxel-mobilized cells when tested against three tumor cell lines (B16, melanoma; C1498, AML; and Yak-1, lymphoma). These results indicate that paclitaxel is an efficient mobilizer of PBSC, leading to early (day 4 to 6) mobilization of PBSC when compared to Cy (day 6 to 8). In addition, paclitaxel was associated with less perturbation of phenotypic and functional characteristics of cells contained within the mobilized PBSC population.
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Affiliation(s)
- U N Verma
- Division of Hematology and Oncology, Georgetown University Medical Center, Vincent T. Lombardi Cancer Center, Washington, DC 20007, USA
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Gewirtz DA, Randolph JK, Chawla J, Orr MS, Fornari FA. Induction of DNA damage, inhibition of DNA synthesis and suppression of c-myc expression by the anthracycline analog, idarubicin (4-demethoxy-daunorubicin) in the MCF-7 breast tumor cell line. Cancer Chemother Pharmacol 1998; 41:361-9. [PMID: 9523731 DOI: 10.1007/s002800050752] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE Studies were designed to elucidate the basis for the antiproliferative activity of the anthracycline antibiotic, idarubicin (4-demethoxy-daunorubicin) in MCF-7 breast tumor cells. METHODS Growth inhibition was evaluated using the MTT tetrazolium dye assay, induction of DNA strand breaks was determined by alkaline elution, inhibition of DNA synthesis was assessed by measuring the incorporation of labelled thymidine into DNA, modulation of the expression of the c-myc oncogene was determined by Northern blotting and the induction of apoptosis was evaluated by alkaline unwinding, static field gel electrophoresis, terminal end labelling and assessment of cell morphology. RESULTS MCF-7 cells were relatively sensitive to idarubicin, with an IC50 value for growth inhibition of approximately 0.01 microM. While DNA strand breakage was not evident below a concentration of 0.1 microM idarubicin, where growth inhibition exceeded 70%, both the inhibition of DNA synthesis and suppression of c-myc expression closely paralleled the profile of antiproliferative activity for idarubicin. Finally, while exposure to idarubicin resulted in a substantial loss of viable cells within 48-72 h, there was no morphological evidence of apoptotic body formation. The absence of apoptosis in cells exposed to idarubicin was supported by studies demonstrating the absence of DNA fragmentation using gel electrophoresis, alkaline elution and in situ DNA end-labelling assays. CONCLUSIONS The results of these studies extend previous results from this laboratory indicating an association between suppression of c-myc expression, inhibition of DNA synthesis and growth arrest by topoisomerase II inhibitors, as well as the lack of induction of apoptotic cell death by topoisomerase II inhibitors in MCF-7 breast tumor cells.
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Affiliation(s)
- D A Gewirtz
- Department of Medicine, Medical College of Virginia, Richmond 23298, USA.
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Abstract
A collection of 70 strains of Escherichia coli from urinary tract infections in spine-injured patients undergoing long-term bladder catheterization were tested for characteristics that have been associated with the ability to produce pyelonephritis. The incidence of the virulence factors were: mannose-resistant haemagglutinins (30%), P-fimbriae (17%), haemolysin (27%), K-antigens (28%) and aerobactin (by bioassay 33%, by gene probe 39%). Only 54% of the strains belonged to the O-serotypes usually associated with urinary tract infections. E. coli carrying the full complement of virulence factors were rare in the urinary tract of the spinal patients and were not associated with episodes of symptomatic pyelonephritis. It is clear that the neuropathic bladder and the presence of the catheter permits a wide variety of bacterial types to colonize the urinary tract and cause infection of the kidney. The identification of host markers rather than bacterial factors is suggested as a more fruitful approach to the early detection of cases likely to progress to pyelonephritis in this group of patients.
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Affiliation(s)
- J Benton
- School of Pure and Applied Biology, University of Wales College of Cardiff, UK
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Ganderton L, Chawla J, Winters C, Wimpenny J, Stickler D. Scanning electron microscopy of bacterial biofilms on indwelling bladder catheters. Eur J Clin Microbiol Infect Dis 1992; 11:789-96. [PMID: 1468417 DOI: 10.1007/bf01960877] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Fifty Foley bladder catheters that had been indwelling for periods ranging from 3 to 83 days (mean 35 days) were examined for the presence of bacterial biofilm. Scanning electron microscopy on freeze-dried cross-sections and fixed, critical point-dried longitudinal sections revealed biofilm formation on the luminal surfaces of 44 of the catheters. Culture of urine samples and sonicates from catheters revealed that the prevalence of bacteriuria was less than that of catheter colonization. A wide range of nosocomial species were found colonizing the catheters, Escherichia coli being most often isolated. The bacterial composition of the biofilms ranged from single species to mixed communities containing up to four species. There was no relationship between the length of time that the catheter had been in situ and the extent of biofilm formation. The biofilms varied in thickness from 3 to 490 microns and were visible as layers of bacterial cells up to about 400 cells deep, embedded in a matrix.
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Affiliation(s)
- L Ganderton
- School of Pure and Applied Biology, University of Wales College of Cardiff, UK
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McInerney PD, Grant A, Chawla J, Stephenson TP. The effect of intravesical Marcain instillation on hyperreflexic detrusor contractions. Paraplegia 1992; 30:127-30. [PMID: 1589288 DOI: 10.1038/sc.1992.40] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Thirty-six patients with suprasacral spinal injury were treated with intravesical local anaesthetic instillation. Eighteen of 32 patients (56%) were converted from an 'ice water positive' hyperreflexic state to an 'ice water negative' state by bupivacaine hydrochloride. Four patients treated with lignocaine hydrochloride showed no benefit. Intravesical local anaesthetic instillation is suggested as a possible treatment for selected cases of detrusor hyperreflexia in patients on intermittent catheterisation.
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Liu K, Moon M, Sulvetta M, Chawla J. International infant mortality rankings: a look behind the numbers. Health Care Financ Rev 1992; 13:105-18. [PMID: 10122000 PMCID: PMC4193257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The very unfavorable infant mortality ranking of the United States in international comparisons is often used to question the quality of health care there. Infant mortality rates, however, implicitly capture a complicated story, measuring much more than differences in health care across countries. This article examines reasons behind international infant mortality rate rankings, including variations in the measurement of vital events, and differences in risk factors across countries. Its goal is to offer a broader context for more informed debate on the meaning of international infant mortality statistics. These statistics offer opportunities to identify strategies for improving the U.S. health care system and learn from other countries that have been more successful.
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Affiliation(s)
- K Liu
- Urban Institute, Washington, DC 20037
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Stickler D, Dolman J, Rolfe S, Chawla J. Activity of some antiseptics against urinary tract pathogens growing as biofilms on silicone surfaces. Eur J Clin Microbiol Infect Dis 1991; 10:410-5. [PMID: 1908381 DOI: 10.1007/bf01968020] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The activity of chlorhexidine, mandelic acid and a mandelic/lactic mixture were tested against biofilms of four species of gram-negative nosocomial organisms that commonly infect the catheterized urinary tract. Cells growing on silicone discs were exposed to concentrations of agents used in bladder instillation. Citrobacter diversus biofilms proved to be sensitive to all three agents. Pseudomonas aeruginosa, Proteus mirabilis and Klebsiella pneumoniae all survived well in chlorhexidine but their viability was significantly reduced by the mandelic acid formulations. These results suggest that bladder instillations of mandelic acid or mandelic/lactic acids would be more effective than chlorhexidine in eliminating biofilms from catheter surfaces.
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Affiliation(s)
- D Stickler
- School of Pure and Applied Biology, University of Wales College of Cardiff, UK
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Jordan MM, Chawla J, Owens MW, George RB. Significance of false-positive serologic tests for histoplasmosis and blastomycosis in an endemic area. Am Rev Respir Dis 1990; 141:1487-90. [PMID: 2112351 DOI: 10.1164/ajrccm/141.6.1487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
False-positive serologic tests for histoplasmosis (H) and blastomycosis (B) are common in populations from endemic areas. In order to determine the significance of false-positive test results, we reviewed the final diagnoses of all patients whose sera were submitted to our laboratory for radioimmunoassay (RIA) and immunodiffusion (ID) during a 3-yr period. Of the 263 patients whose sera were examined, 29 (11%) had H or B; 41 (17.5%) of the remaining 234 patients had false-positive test results. Of these 41 patients, 31 were positive for H alone, and 10 had antibodies to both H and B. All three patients with false-positive ID tests for histoplasmosis also had positive titers (greater than or equal to 1:16) on RIA. No patient had a false-positive ID result for blastomycosis. The percentage of patients in each of five major diagnostic categories with and without false-positive serologic tests was similar (p greater than 0.05). The majority of patients had pulmonary infections, almost half of which were granulomatous infections other than H or B; this reflects the clinical indications for requesting fungal serologic tests. A positive fungal serology is not useful in suggesting the presence of a pulmonary disease other than H or B in patients from an endemic area suspected of having a pulmonary mycosis.
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Affiliation(s)
- M M Jordan
- Department of Medicine, Louisiana State University School of Medicine, Shreveport 71130
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Stickler D, Dolman J, Rolfe S, Chawla J. Activity of antiseptics against Escherichia coli growing as biofilms on silicone surfaces. Eur J Clin Microbiol Infect Dis 1989; 8:974-8. [PMID: 2513198 DOI: 10.1007/bf01967568] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The activity of chlorhexidine, acetic, lactic and mandelic acids were examined against biofilms of Escherichia coli established on silicone discs and against the test strain growing in suspension in urine. The results showed that the concentrations of chlorhexidine and acetic acid normally used for bladder instillations to control infections in patients with indwelling catheters failed to eliminate cells from the biofilm in exposure periods of up to 2 h. Lactic acid (1% v/v) had a bactericidal effect on planktonic cells but poor activity against cells in the biofilm. Mandelic acid (1% v/v), and mandelic (1% v/v) and lactic acid (1% v/v) mixtures eliminated organisms from both suspensions and biofilms. It is suggested that these solutions be considered as alternatives to acetic acid and chlorhexidine for the washing of catheterized bladders.
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Affiliation(s)
- D Stickler
- School of Pure and Applied Biology, University of Wales College of Cardiff, UK
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Abstract
Forty-two spinal injury patients underwent single or sequential urodynamic studies to assess the value of dynamic urethral pressure using transducer tipped catheters. Three groups of patients were identified: those with poor detrusor function, those with unsustained dyssynergia and those with sustained dyssynergia. All patients demonstrated some dyssynergia. Urethral needle EMG mirrored urethral pressure changes accurately. The addition of dynamic profilometry to fluoroscopy, detrusor pressure and urethral EMG has clarified our understanding of lower urinary tract behaviour after cord lesions.
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Abstract
Of 500 patients seen because of rape, semen was identified in vaginal secretions by the identification of spermatozoa in 61%, by an acid phosphatase value of 50 units or more in 40%, and by the identification of a foreign blood group substance or a high titer of own blood group substance in 16%. The addition of the determination of the acid phosphatase to the search for spermatozoa identified semen in only 1.4% more patients, or a total of 62.4%. Identification and titers of blood group substance were confirmatory only, but further characterized the source of the semen in 25% of those patients with spermatozoa. Spermatozoa were identified for as long as 48 hours, and elevated acid phosphatase was not found after 18 hours. Acid phosphatase was elevated in only 62% of patients with spermatozoa.
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Vignadndra V, Ghee LT, Chawla J. EEG in brain abscess: its value in localization compared to other diagnostic tests. Electroencephalogr Clin Neurophysiol 1975; 38:611-22. [PMID: 50187 DOI: 10.1016/0013-4694(75)90162-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The EEG records of 13 cases of brain abscess were reviewed for their value in localization. Of the 11 cases of supratentorial abscesses localization was achieved in 10, and correct lateralization in the remaining 1 case. Two other cases were cerebellar abscesses; 1 of them showed a false cerebral localization; the other showed no focal abnormalities. The most consistent EEG localizing sign was focal arrhythmic delta waves. These were as slow as 0.5 c/sec in 6 of the 13 cases. Epileptiform discharges in the pre-operative EEG were seen in 4 of the 13 cases. Asymmetry of beta activity correctly lateralized the abscess in 7 of the 11 supratentorial abscesses. Generalized abnormalities when present correlated with depression of consciousness rather than with the duration of illness or the presence of raised intracranial pressure. Indium brain scans were done in 6 supratentorial abscesses and provided correct or approximate localization in 5. Carotid angiograms were also done in 7 cases and localized the abscess in 6. Our findings show that the EEG is comparable to brain scans and contrast radiological studies in localizing supratentorial abscesses. We feel that the combination of EEGs and brain scanslization in suspected brain abscess.
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