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Avelar-Rodríguez D, Peña-Vélez R, Popov J, Hill L, Ryan PM. Probiotics and non-alcoholic fatty liver disease in children and adolescents: a systematic review. Rev Esp Enferm Dig 2023; 115:418-427. [PMID: 36412490 DOI: 10.17235/reed.2022.8796/2022] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
BACKGROUND non-alcoholic fatty liver disease (NAFLD) in childhood is an increasing global public health issue with significant long-term consequences. NAFLD management mainly consists of lifestyle modifications, however, adjunct pharmacological therapies are currently lacking. Gut microbiota manipulation via probiotics may alter the course of pediatric NAFLD. The objective of this systematic review was to synthesize all the available literature on the use of probiotics in children and adolescents with NAFLD. METHODS PubMed, EBSCOhost, Scopus, Web of Science, and Cochrane Library were systematically searched for trials on the use of probiotics in pediatric NAFLD. A quantitative DerSimonian Laird random effects meta-analysis was performed when possible; otherwise, a narrative summary of the study outcomes was presented and discussed. A separate search was completed to include all the ongoing registered trials on probiotics use in pediatric NAFLD. RESULTS five randomized controlled trials met the inclusion criteria. Of these, four trials were included in the final quantitative analysis. Probiotic therapy significantly reduced the levels of alanine aminotransferase (ALT) (mean difference: -10.39 [-19.85, -0.93]), however significant heterogeneity between studies was identified (I2, 93 %). CONCLUSIONS there is insufficient evidence to support probiotics in the treatment of pediatric NAFLD given the substantial degree of discordance amongst the available trials. Lifestyle modifications focusing on maintaining a normal BMI and regular exercise continue to be the gold standard approach to treating NAFLD in children.
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Affiliation(s)
| | - Rubén Peña-Vélez
- Gastroenterología y Nutrición, Hospital General de Puebla "Dr. Eduardo Vázquez N", México
| | - Jelena Popov
- College of Medicine and Health. University College Cork
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Konnyu KJ, Yogasingam S, Lépine J, Sullivan K, Alabousi M, Edwards A, Hillmer M, Karunananthan S, Lavis JN, Linklater S, Manns BJ, Moher D, Mortazhejri S, Nazarali S, Paprica PA, Ramsay T, Ryan PM, Sargious P, Shojania KG, Straus SE, Tonelli M, Tricco A, Vachon B, Yu CH, Zahradnik M, Trikalinos TA, Grimshaw JM, Ivers N. Quality improvement strategies for diabetes care: Effects on outcomes for adults living with diabetes. Cochrane Database Syst Rev 2023; 5:CD014513. [PMID: 37254718 PMCID: PMC10233616 DOI: 10.1002/14651858.cd014513] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND There is a large body of evidence evaluating quality improvement (QI) programmes to improve care for adults living with diabetes. These programmes are often comprised of multiple QI strategies, which may be implemented in various combinations. Decision-makers planning to implement or evaluate a new QI programme, or both, need reliable evidence on the relative effectiveness of different QI strategies (individually and in combination) for different patient populations. OBJECTIVES To update existing systematic reviews of diabetes QI programmes and apply novel meta-analytical techniques to estimate the effectiveness of QI strategies (individually and in combination) on diabetes quality of care. SEARCH METHODS We searched databases (CENTRAL, MEDLINE, Embase and CINAHL) and trials registers (ClinicalTrials.gov and WHO ICTRP) to 4 June 2019. We conducted a top-up search to 23 September 2021; we screened these search results and 42 studies meeting our eligibility criteria are available in the awaiting classification section. SELECTION CRITERIA We included randomised trials that assessed a QI programme to improve care in outpatient settings for people living with diabetes. QI programmes needed to evaluate at least one system- or provider-targeted QI strategy alone or in combination with a patient-targeted strategy. - System-targeted: case management (CM); team changes (TC); electronic patient registry (EPR); facilitated relay of clinical information (FR); continuous quality improvement (CQI). - Provider-targeted: audit and feedback (AF); clinician education (CE); clinician reminders (CR); financial incentives (FI). - Patient-targeted: patient education (PE); promotion of self-management (PSM); patient reminders (PR). Patient-targeted QI strategies needed to occur with a minimum of one provider or system-targeted strategy. DATA COLLECTION AND ANALYSIS We dual-screened search results and abstracted data on study design, study population and QI strategies. We assessed the impact of the programmes on 13 measures of diabetes care, including: glycaemic control (e.g. mean glycated haemoglobin (HbA1c)); cardiovascular risk factor management (e.g. mean systolic blood pressure (SBP), low-density lipoprotein cholesterol (LDL-C), proportion of people living with diabetes that quit smoking or receiving cardiovascular medications); and screening/prevention of microvascular complications (e.g. proportion of patients receiving retinopathy or foot screening); and harms (e.g. proportion of patients experiencing adverse hypoglycaemia or hyperglycaemia). We modelled the association of each QI strategy with outcomes using a series of hierarchical multivariable meta-regression models in a Bayesian framework. The previous version of this review identified that different strategies were more or less effective depending on baseline levels of outcomes. To explore this further, we extended the main additive model for continuous outcomes (HbA1c, SBP and LDL-C) to include an interaction term between each strategy and average baseline risk for each study (baseline thresholds were based on a data-driven approach; we used the median of all baseline values reported in the trials). Based on model diagnostics, the baseline interaction models for HbA1c, SBP and LDL-C performed better than the main model and are therefore presented as the primary analyses for these outcomes. Based on the model results, we qualitatively ordered each QI strategy within three tiers (Top, Middle, Bottom) based on its magnitude of effect relative to the other QI strategies, where 'Top' indicates that the QI strategy was likely one of the most effective strategies for that specific outcome. Secondary analyses explored the sensitivity of results to choices in model specification and priors. Additional information about the methods and results of the review are available as Appendices in an online repository. This review will be maintained as a living systematic review; we will update our syntheses as more data become available. MAIN RESULTS We identified 553 trials (428 patient-randomised and 125 cluster-randomised trials), including a total of 412,161 participants. Of the included studies, 66% involved people living with type 2 diabetes only. Participants were 50% female and the median age of participants was 58.4 years. The mean duration of follow-up was 12.5 months. HbA1c was the commonest reported outcome; screening outcomes and outcomes related to cardiovascular medications, smoking and harms were reported infrequently. The most frequently evaluated QI strategies across all study arms were PE, PSM and CM, while the least frequently evaluated QI strategies included AF, FI and CQI. Our confidence in the evidence is limited due to a lack of information on how studies were conducted. Four QI strategies (CM, TC, PE, PSM) were consistently identified as 'Top' across the majority of outcomes. All QI strategies were ranked as 'Top' for at least one key outcome. The majority of effects of individual QI strategies were modest, but when used in combination could result in meaningful population-level improvements across the majority of outcomes. The median number of QI strategies in multicomponent QI programmes was three. Combinations of the three most effective QI strategies were estimated to lead to the below effects: - PR + PSM + CE: decrease in HbA1c by 0.41% (credibility interval (CrI) -0.61 to -0.22) when baseline HbA1c < 8.3%; - CM + PE + EPR: decrease in HbA1c by 0.62% (CrI -0.84 to -0.39) when baseline HbA1c > 8.3%; - PE + TC + PSM: reduction in SBP by 2.14 mmHg (CrI -3.80 to -0.52) when baseline SBP < 136 mmHg; - CM + TC + PSM: reduction in SBP by 4.39 mmHg (CrI -6.20 to -2.56) when baseline SBP > 136 mmHg; - TC + PE + CM: LDL-C lowering of 5.73 mg/dL (CrI -7.93 to -3.61) when baseline LDL < 107 mg/dL; - TC + CM + CR: LDL-C lowering by 5.52 mg/dL (CrI -9.24 to -1.89) when baseline LDL > 107 mg/dL. Assuming a baseline screening rate of 50%, the three most effective QI strategies were estimated to lead to an absolute improvement of 33% in retinopathy screening (PE + PR + TC) and 38% absolute increase in foot screening (PE + TC + Other). AUTHORS' CONCLUSIONS There is a significant body of evidence about QI programmes to improve the management of diabetes. Multicomponent QI programmes for diabetes care (comprised of effective QI strategies) may achieve meaningful population-level improvements across the majority of outcomes. For health system decision-makers, the evidence summarised in this review can be used to identify strategies to include in QI programmes. For researchers, this synthesis identifies higher-priority QI strategies to examine in further research regarding how to optimise their evaluation and effects. We will maintain this as a living systematic review.
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Affiliation(s)
- Kristin J Konnyu
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Sharlini Yogasingam
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Johanie Lépine
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Katrina Sullivan
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | | | - Alun Edwards
- Department of Medicine, University of Calgary, Calgary, Canada
| | - Michael Hillmer
- Institute for Health Policy, Management, and Evaluation, University of Toronto, Toronto, Canada
| | - Sathya Karunananthan
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Canada
| | - John N Lavis
- McMaster Health Forum, Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Canada
| | - Stefanie Linklater
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Braden J Manns
- Department of Medicine and Community Health Sciences, University of Calgary, Calgary, Canada
| | - David Moher
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Sameh Mortazhejri
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada
| | - Samir Nazarali
- Department of Ophthalmology and Visual Sciences, University of Alberta, Edmonton, Canada
| | - P Alison Paprica
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada
| | - Timothy Ramsay
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | | | - Peter Sargious
- Department of Medicine, University of Calgary, Calgary, Canada
| | - Kaveh G Shojania
- University of Toronto Centre for Patient Safety, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - Sharon E Straus
- Knowledge Translation Program, Li Ka Shing Knowledge Institute, St. Michael's Hospital and University of Toronto, Toronto, Canada
| | - Marcello Tonelli
- Department of Medicine and Community Health Sciences, University of Calgary, Calgary, Canada
| | - Andrea Tricco
- Knowledge Translation Program, Li Ka Shing Knowledge Institute, St. Michael's Hospital and University of Toronto, Toronto, Canada
- Epidemiology Division and Institute of Health Policy, Management, and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada
- Queen's Collaboration for Health Care Quality: A JBI Centre of Excellence, Queen's University, Kingston, Canada
| | - Brigitte Vachon
- School of Rehabilitation, Occupational Therapy Program, University of Montreal, Montreal, Canada
| | - Catherine Hy Yu
- Department of Medicine, St. Michael's Hospital, Toronto, Canada
| | - Michael Zahradnik
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Thomas A Trikalinos
- Departments of Health Services, Policy, and Practice and Biostatistics, Center for Evidence Synthesis in Health, Brown University School of Public Health, Providence, Rhode Island, USA
| | - Jeremy M Grimshaw
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Department of Medicine, University of Ottawa, Ottawa, Canada
| | - Noah Ivers
- Department of Family and Community Medicine, Women's College Hospital, Toronto, Canada
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Ryan PM, Hamilton JK. What do I need to know about liraglutide (Saxenda), the glucagon-like peptide 1 receptor agonist for weight management in children with obesity? Paediatr Child Health 2022; 27:201-202. [PMID: 35859679 PMCID: PMC9291360 DOI: 10.1093/pch/pxac026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 02/10/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Jill K Hamilton
- Department of Paediatrics, University of Toronto, Toronto, Ontario, Canada
- Division of Endocrinology, The Hospital for Sick Children, Toronto, Ontario, Canada
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Parthasarathy P, Shaikh H, Ryan PM, Mondal T. Does treatment with hydroxychloroquine or chloroquine lead to QTc prolongation in children? Progress in Pediatric Cardiology 2022. [DOI: 10.1016/j.ppedcard.2021.101465] [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: 11/29/2022]
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Cousin E, Duncan BB, Stein C, Ong KL, Vos T, Abbafati C, Abbasi-Kangevari M, Abdelmasseh M, Abdoli A, Abd-Rabu R, Abolhassani H, Abu-Gharbieh E, Accrombessi MMK, Adnani QES, Afzal MS, Agarwal G, Agrawaal KK, Agudelo-Botero M, Ahinkorah BO, Ahmad S, Ahmad T, Ahmadi K, Ahmadi S, Ahmadi A, Ahmed A, Ahmed Salih Y, Akande-Sholabi W, Akram T, Al Hamad H, Al-Aly Z, Alcalde-Rabanal JE, Alipour V, Aljunid SM, Al-Raddadi RM, Alvis-Guzman N, Amini S, Ancuceanu R, Andrei T, Andrei CL, Anjana RM, Ansar A, Antonazzo IC, Antony B, Anyasodor AE, Arabloo J, Arizmendi D, Armocida B, Artamonov AA, Arulappan J, Aryan Z, Asgari S, Ashraf T, Astell-Burt T, Atorkey P, Atout MMW, Ayanore MA, Badiye AD, Baig AA, Bairwa M, Baker JL, Baltatu OC, Banik PC, Barnett A, Barone MTU, Barone-Adesi F, Barrow A, Bedi N, Belete R, Belgaumi UI, Bell AW, Bennett DA, Bensenor IM, Beran D, Bhagavathula AS, Bhaskar S, Bhattacharyya K, Bhojaraja VS, Bijani A, Bikbov B, Birara S, Bodolica V, Bonny A, Brenner H, Briko NI, Butt ZA, Caetano dos Santos FL, Cámera LA, Campos-Nonato IR, Cao Y, Cao C, Cerin E, Chakraborty PA, Chandan JS, Chattu VK, Chen S, Choi JYJ, Choudhari SG, Chowdhury EK, Chu DT, Corso B, Dadras O, Dai X, Damasceno AAM, Dandona L, Dandona R, Dávila-Cervantes CA, De Neve JW, Denova-Gutiérrez E, Dhamnetiya D, Diaz D, Ebtehaj S, Edinur HA, Eftekharzadeh S, El Sayed I, Elgendy IY, Elhadi M, Elmonem MA, Faisaluddin M, Farooque U, Feng X, Fernandes E, Fischer F, Flood D, Freitas M, Gaal PA, Gad MM, Gaewkhiew P, Getacher L, Ghafourifard M, Ghanei Gheshlagh R, Ghashghaee A, Ghith N, Ghozali G, Gill PS, Ginawi IA, Glushkova EV, Golechha M, Gopalani SV, Guimarães RA, Gupta RD, Gupta R, Gupta VK, Gupta VB, Gupta S, Habtewold TD, Hafezi-Nejad N, Halwani R, Hanif A, Hankey GJ, Haque S, Hasaballah AI, Hasan SS, Hashi A, Hassanipour S, Hay SI, Hayat K, Heidari M, Hossain MBH, Hossain S, Hosseini M, Hoveidamanesh S, Huang J, Humayun A, Hussain R, Hwang BF, Ibitoye SE, Ikuta KS, Inbaraj LR, Iqbal U, Islam MS, Islam SMS, Islam RM, Ismail NE, Isola G, Itumalla R, Iwagami M, Iyamu IO, Jahani MA, Jakovljevic M, Jayawardena R, Jha RP, John O, Jonas JB, Joo T, Kabir A, Kalhor R, Kamath A, Kanchan T, Kandel H, Kapoor N, Kayode GA, Kebede SA, Keshavarz P, Keykhaei M, Khader YS, Khajuria H, Khan MAB, Khan MN, Khan M, Khater AM, Khoja TAM, Khubchandani J, Kim MS, Kim YJ, Kimokoti RW, Kisa S, Kisa A, Kivimäki M, Korshunov VA, Korzh O, Koyanagi A, Krishan K, Kuate Defo B, Kumar GA, Kumar N, Kusuma D, La Vecchia C, Lacey B, Larsson AO, Lasrado S, Lee WC, Lee CB, Lee PH, Lee SWH, Li MC, Lim SS, Lim LL, Lucchetti G, Majeed A, Malik AA, Mansouri B, Mantovani LG, Martini S, Mathur P, McAlinden C, Mehedi N, Mekonnen T, Menezes RG, Mersha AG, Miao Jonasson J, Miazgowski T, Michalek IM, Mirica A, Mirrakhimov EM, Mirza AZ, Mithra P, Mohammadian-Hafshejani A, Mohammadpourhodki R, Mohammed A, Mokdad AH, Molokhia M, Monasta L, Moni MA, Moradpour F, Moradzadeh R, Mostafavi E, Mueller UO, Murray CJL, Mustafa A, Nagel G, Nangia V, Naqvi AA, Nayak BP, Nazari J, Ndejjo R, Negoi RI, Neupane Kandel S, Nguyen CT, Nguyen HLT, Noubiap JJ, Nowak C, Oancea B, Odukoya OO, Oguntade AS, Ojo TT, Olagunju AT, Onwujekwe OE, Ortiz A, Owolabi MO, Palladino R, Panda-Jonas S, Pandi-Perumal SR, Pardhan S, Parekh T, Parvizi M, Pepito VCF, Perianayagam A, Petcu IR, Pilania M, Podder V, Polibin RV, Postma MJ, Prashant A, Rabiee N, Rabiee M, Rahimi-Movaghar V, Rahman MA, Rahman MM, Rahman M, Rahmawaty S, Rajai N, Ram P, Rana J, Ranabhat K, Ranasinghe P, Rao CR, Rao S, Rawaf S, Rawaf DL, Rawal L, Renzaho AMN, Rezaei N, Rezapour A, Riahi SM, Ribeiro D, Rodriguez JAB, Roever L, Rohloff P, Rwegerera GM, Ryan PM, Saber-Ayad MM, Sabour S, Saddik B, Saeedi Moghaddam S, Sahebkar A, Sahoo H, Saif-Ur-Rahman KM, Salimzadeh H, Samaei M, Sanabria J, Santric-Milicevic MM, Sathian B, Sathish T, Schlaich MP, Seidu AA, Šekerija M, Senthil Kumar N, Seylani A, Shaikh MA, Shamshad H, Shawon MSR, Sheikhbahaei S, Shetty JK, Shiri R, Shivakumar KM, Shuval K, Singh JA, Singh A, Skryabin VY, Skryabina AA, Sofi-Mahmudi A, Soheili A, Sun J, Szerencsés V, Szócska M, Tabarés-Seisdedos R, Tadbiri H, Tadesse EG, Tariqujjaman M, Thankappan KR, Thapar R, Thomas N, Timalsina B, Tobe-Gai R, Tonelli M, Tovani-Palone MR, Tran BX, Tripathy JP, Tudor Car L, Tusa BS, Uddin R, Upadhyay E, Valadan Tahbaz S, Valdez PR, Vasankari TJ, Verma M, Villalobos-Daniel VE, Vladimirov SK, Vo B, Vu GT, Vukovic R, Waheed Y, Wamai RG, Werdecker A, Wickramasinghe ND, Winkler AS, Wubishet BL, Xu X, Xu S, Yahyazadeh Jabbari SH, Yatsuya H, Yaya S, Yazie TSY, Yi S, Yonemoto N, Yunusa I, Zadey S, Zaman SB, Zamanian M, Zamora N, Zastrozhin MS, Zastrozhina A, Zhang ZJ, Zhong C, Zmaili M, Zumla A, Naghavi M, Schmidt MI. Diabetes mortality and trends before 25 years of age: an analysis of the Global Burden of Disease Study 2019. Lancet Diabetes Endocrinol 2022; 10:177-192. [PMID: 35143780 PMCID: PMC8860753 DOI: 10.1016/s2213-8587(21)00349-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 10/27/2021] [Accepted: 12/10/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Diabetes, particularly type 1 diabetes, at younger ages can be a largely preventable cause of death with the correct health care and services. We aimed to evaluate diabetes mortality and trends at ages younger than 25 years globally using data from the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2019. METHODS We used estimates of GBD 2019 to calculate international diabetes mortality at ages younger than 25 years in 1990 and 2019. Data sources for causes of death were obtained from vital registration systems, verbal autopsies, and other surveillance systems for 1990-2019. We estimated death rates for each location using the GBD Cause of Death Ensemble model. We analysed the association of age-standardised death rates per 100 000 population with the Socio-demographic Index (SDI) and a measure of universal health coverage (UHC) and described the variability within SDI quintiles. We present estimates with their 95% uncertainty intervals. FINDINGS In 2019, 16 300 (95% uncertainty interval 14 200 to 18 900) global deaths due to diabetes (type 1 and 2 combined) occurred in people younger than 25 years and 73·7% (68·3 to 77·4) were classified as due to type 1 diabetes. The age-standardised death rate was 0·50 (0·44 to 0·58) per 100 000 population, and 15 900 (97·5%) of these deaths occurred in low to high-middle SDI countries. The rate was 0·13 (0·12 to 0·14) per 100 000 population in the high SDI quintile, 0·60 (0·51 to 0·70) per 100 000 population in the low-middle SDI quintile, and 0·71 (0·60 to 0·86) per 100 000 population in the low SDI quintile. Within SDI quintiles, we observed large variability in rates across countries, in part explained by the extent of UHC (r2=0·62). From 1990 to 2019, age-standardised death rates decreased globally by 17·0% (-28·4 to -2·9) for all diabetes, and by 21·0% (-33·0 to -5·9) when considering only type 1 diabetes. However, the low SDI quintile had the lowest decline for both all diabetes (-13·6% [-28·4 to 3·4]) and for type 1 diabetes (-13·6% [-29·3 to 8·9]). INTERPRETATION Decreasing diabetes mortality at ages younger than 25 years remains an important challenge, especially in low and low-middle SDI countries. Inadequate diagnosis and treatment of diabetes is likely to be major contributor to these early deaths, highlighting the urgent need to provide better access to insulin and basic diabetes education and care. This mortality metric, derived from readily available and frequently updated GBD data, can help to monitor preventable diabetes-related deaths over time globally, aligned with the UN's Sustainable Development Targets, and serve as an indicator of the adequacy of basic diabetes care for type 1 and type 2 diabetes across nations. FUNDING Bill & Melinda Gates Foundation.
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Paulson KR, Kamath AM, Alam T, Bienhoff K, Abady GG, Abbas J, Abbasi-Kangevari M, Abbastabar H, Abd-Allah F, Abd-Elsalam SM, Abdoli A, Abedi A, Abolhassani H, Abreu LG, Abu-Gharbieh E, Abu-Rmeileh NME, Abushouk AI, Adamu AL, Adebayo OM, Adegbosin AE, Adekanmbi V, Adetokunboh OO, Adeyinka DA, Adsuar JC, Afshari K, Aghaali M, Agudelo-Botero M, Ahinkorah BO, Ahmad T, Ahmadi K, Ahmed MB, Aji B, Akalu Y, Akinyemi OO, Aklilu A, Al-Aly Z, Alam K, Alanezi FM, Alanzi TM, Alcalde-Rabanal JE, Al-Eyadhy A, Ali T, Alicandro G, Alif SM, Alipour V, Alizade H, Aljunid SM, Almasi-Hashiani A, Almasri NA, Al-Mekhlafi HM, Alonso J, Al-Raddadi RM, Altirkawi KA, Alumran AK, Alvis-Guzman N, Alvis-Zakzuk NJ, Ameyaw EK, Amini S, Amini-Rarani M, Amit AML, Amugsi DA, Ancuceanu R, Anderlini D, Andrei CL, Ansari F, Ansari-Moghaddam A, Antonio CAT, Antriyandarti E, Anvari D, Anwer R, Aqeel M, Arabloo J, Arab-Zozani M, Aripov T, Ärnlöv J, Artanti KD, Arzani A, Asaad M, Asadi-Aliabadi M, Asadi-Pooya AA, Asghari Jafarabadi M, Athari SS, Athari SM, Atnafu DD, Atreya A, Atteraya MS, Ausloos M, Awan AT, Ayala Quintanilla BP, Ayano G, Ayanore MA, Aynalem YA, Azari S, Azarian G, Azene ZN, B DB, Babaee E, Badiye AD, Baig AA, Banach M, Banik PC, Barker-Collo SL, Barqawi HJ, Bassat Q, Basu S, Baune BT, Bayati M, Bedi N, Beghi E, Beghi M, Bell ML, Bendak S, Bennett DA, Bensenor IM, Berhe K, Berman AE, Bezabih YM, Bhagavathula AS, Bhandari D, Bhardwaj N, Bhardwaj P, Bhattacharyya K, Bhattarai S, Bhutta ZA, Bikbov B, Biondi A, Birihane BM, Biswas RK, Bohlouli S, Bragazzi NL, Breusov AV, Brunoni AR, Burkart K, Burugina Nagaraja S, Busse R, Butt ZA, Caetano dos Santos FL, Cahuana-Hurtado L, Camargos P, Cámera LA, Cárdenas R, Carreras G, Carrero JJ, Carvalho F, Castaldelli-Maia JM, Castañeda-Orjuela CA, Castelpietra G, Cerin E, Chang JC, Chanie WF, Charan J, Chatterjee S, Chattu SK, Chattu VK, Chaturvedi S, Chen S, Cho DY, Choi JYJ, Chu DT, Ciobanu LG, Cirillo M, Conde J, Costa VM, Couto RAS, Dachew BA, Dahlawi SMA, Dai H, Dai X, Dandona L, Dandona R, Daneshpajouhnejad P, Darmstadt GL, Das JK, Dávila-Cervantes CA, Davis AC, Davletov K, De la Hoz FP, De Leo D, Deeba F, Denova-Gutiérrez E, Dervenis N, Desalew A, Deuba K, Dey S, Dharmaratne SD, Dhingra S, Dhungana GP, Dias da Silva D, Diaz D, Dorostkar F, Doshmangir L, Dubljanin E, Duraes AR, Eagan AW, Edinur HA, Efendi F, Eftekharzadeh S, El Sayed I, El Tantawi M, Elbarazi I, Elgendy IY, El-Jaafary SI, Emami A, Enany S, Eyawo O, Ezzikouri S, Faris PS, Farzadfar F, Fattahi N, Fauk NK, Fazlzadeh M, Feigin VL, Ferede TY, Fereshtehnejad SM, Fernandes E, Ferrara P, Filip I, Fischer F, Fisher JL, Foigt NA, Folayan MO, Foroutan M, Franklin RC, Freitas M, Friedman SD, Fukumoto T, Gad MM, Gaidhane AM, Gaidhane S, Gaihre S, Gallus S, Garcia-Basteiro AL, Garcia-Gordillo MA, Gardner WM, Gaspar Fonseca M, Gebremedhin KB, Getacher L, Ghashghaee A, Gholamian A, Gilani SA, Gill TK, Giussani G, Gnedovskaya EV, Godinho MA, Goel A, Golechha M, Gona PN, Gopalani SV, Goudarzi H, Grivna M, Gugnani HC, Guido D, Guimarães RA, Gupta RD, Gupta R, Hafezi-Nejad N, Haider MR, Haj-Mirzaian A, Hamidi S, Hanif A, Hankey GJ, Hargono A, Hasaballah AI, Hasan MM, Hasan SS, Hassan A, Hassanipour S, Hassankhani H, Havmoeller RJ, Hayat K, Heidari-Soureshjani R, Henry NJ, Herteliu C, Hole MK, Holla R, Hossain N, Hosseini M, Hosseinzadeh M, Hostiuc M, Hostiuc S, Househ M, Huang J, Humayun A, Hwang BF, Iavicoli I, Ibitoye SE, Ikuta KS, Ilesanmi OS, Ilic IM, Ilic MD, Inamdar S, Inbaraj LR, Iqbal K, Iqbal U, Islam MM, Islam SMS, Iso H, Iwagami M, Iwu CCD, Jaafari J, Jacobsen KH, Jagnoor J, Jain V, Janodia MD, Javaheri T, Javanmardi F, Jayaram S, Jayatilleke AU, Jenabi E, Jha RP, Ji JS, John O, Jonas JB, Joo T, Joseph N, Joukar F, Jozwiak JJ, Jürisson M, Kabir A, Kabir Z, Kalankesh LR, Kamyari N, Kanchan T, Kapoor N, Karami Matin B, Karch A, Karimi SE, Kassahun G, Kayode GA, Kazemi Karyani A, Kemmer L, Khalid N, Khalilov R, Khammarnia M, Khan EA, Khan G, Khan M, Khan MN, Khang YH, Khatab K, Khater AM, Khater MM, Khayamzadeh M, Khosravi A, Kim D, Kim YE, Kim YJ, Kimokoti RW, Kisa A, Kisa S, Kissoon N, Kopec JA, Kosen S, Koul PA, Koulmane Laxminarayana SL, Koyanagi A, Krishan K, Krishnamoorthy V, Kuate Defo B, Kucuk Bicer B, Kulkarni V, Kumar GA, Kumar M, Kumar N, Kurmi OP, Kusuma D, La Vecchia C, Lacey B, Lalloo R, Lami FH, Landires I, Larsson AO, Lasrado S, Lassi ZS, Lauriola P, Lee PH, Lee SWH, Lee YH, Leigh J, Leonardi M, Lewycka S, Li B, Li S, Liang J, Lim LL, Limenih MA, Lin RT, Liu X, Lodha R, Lopez AD, Lozano R, Lugo A, Lunevicius R, Mackay MT, Madhava Kunjathur S, Magnani FG, Mahadeshwara Prasad DR, Maheri M, Mahmoudi M, Majeed A, Maled V, Maleki A, Maleki S, Malekzadeh R, Malik AA, Malta DC, Mamun AA, Mansouri B, Mansournia MA, Martinez G, Martini S, Martins-Melo FR, Masoumi SZ, Maulik PK, McAlinden C, McGrath JJ, Medina-Solís CE, Mehrabi Nasab E, Mejia-Rodriguez F, Memish ZA, Mendoza W, Menezes RG, Mengesha EW, Mensah GA, Meretoja A, Meretoja TJ, Mersha AM, Mestrovic T, Miazgowski B, Miazgowski T, Michalek IM, Miller TR, Mini GK, Miri M, Mirica A, Mirrakhimov EM, Mirzaei H, Mirzaei M, Moazen B, Moghadaszadeh M, Mohajer B, Mohamad O, Mohammad Y, Mohammadi SM, Mohammadian-Hafshejani A, Mohammed S, Mokdad AH, Molokhia M, Monasta L, Mondello S, Moni MA, Moore CE, Moradi G, Moradi M, Moradzadeh R, Moraga P, Morawska L, Morrison SD, Mosser JF, Mousavi Khaneghah A, Mustafa G, Naderi M, Nagarajan AJ, Nagaraju SP, Naghavi M, Naghshtabrizi B, Naimzada MD, Nangia V, Narasimha Swamy S, Nascimento BR, Naveed M, Nazari J, Ndejjo R, Negoi I, Negoi RI, Nena E, Nepal S, Netsere HB, Nguefack-Tsague G, Ngunjiri JW, Nguyen CTY, Nguyen CT, Nguyen HLT, Nigatu YT, Nigussie SN, Nixon MR, Nnaji CA, Nomura S, Noor NM, Noubiap JJ, Nuñez-Samudio V, Nwatah VE, Oancea B, Odukoya OO, Ogbo FA, Olusanya BO, Olusanya JO, Omar Bali A, Onwujekwe OE, Ortiz A, Otoiu A, Otstavnov N, Otstavnov SS, Owolabi MO, P A M, Padubidri JR, Pakhale S, Pakshir K, Pal PK, Palladino R, Pana A, Panda-Jonas S, Pandey A, Pandey A, Pandi-Perumal SR, Pangaribuan HU, Pardo-Montaño AM, Park EK, Patel SK, Patton GC, Pawar S, Pazoki Toroudi H, Peden AE, Pepito VCF, Peprah EK, Pereira J, Pérez-Gómez J, Perico N, Pesudovs K, Pilgrim T, Pinheiro M, Piradov MA, Pirsaheb M, Platts-Mills JA, Pokhrel KN, Postma MJ, Pourjafar H, Prada SI, Prakash S, Pupillo E, Quazi Syed Z, Rabiee N, Radfar A, Rafiee A, Rafiei A, Raggi A, Rahimzadeh S, Rahman MHU, Rahmani AM, Ramezanzadeh K, Rana J, Ranabhat CL, Rao SJ, Rasella D, Rastogi P, Rathi P, Rawaf DL, Rawaf S, Rawasia WF, Rawassizadeh R, Reiner Jr RC, Remuzzi G, Renzaho AMN, Reshmi B, Resnikoff S, Rezaei N, Rezaei N, Rezapour A, Riahi SM, Ribeiro D, Rickard J, Roever L, Ronfani L, Rothenbacher D, Rubagotti E, Rumisha SF, Ryan PM, Saddik B, Sadeghi E, Saeedi Moghaddam S, Sagar R, Sahebkar A, Salahshoor MR, Salehi S, Salem MR, Salimzadeh H, Salomon JA, Samodra YL, Samy AM, Sanabria J, Santric-Milicevic MM, Saraswathy SYI, Sarker AR, Sarrafzadegan N, Sarveazad A, Sathian B, Sathish T, Sattin D, Saxena S, Saya GK, Saylan M, Schiavolin S, Schlaich MP, Schwebel DC, Schwendicke F, Senthilkumaran S, Sepanlou SG, Serván-Mori E, Sha F, Shafaat O, Shahabi S, Shahbaz M, Shaheen AA, Shahid I, Shaikh MA, Shakiba S, Shalash AS, Shams-Beyranvand M, Shannawaz M, Sharafi K, Sheikh A, Sheikhbahaei S, Shiferaw WS, Shigematsu M, Shin JI, Shiri R, Shiue I, Shuval K, Siddiqi TJ, Sidemo NB, Sigfusdottir ID, Sigurvinsdottir R, Silva JP, Silverberg JIS, Simonetti B, Singh BB, Singh JA, Singhal D, Sinha DN, Skiadaresi E, Skryabin VY, Skryabina AA, Sleet DA, Sobaih BH, Sobhiyeh MR, Soltani S, Soriano JB, Spurlock EE, Sreeramareddy CT, Steiropoulos P, Stokes MA, Stortecky S, Sufiyan MB, Suliankatchi Abdulkader R, Sulo G, Swope CB, Sykes BL, Szeto MD, Szócska M, Tabarés-Seisdedos R, Tadesse EG, Taherkhani A, Tamiru AT, Tareque MI, Tehrani-Banihashemi A, Temsah MH, Tesfay FH, Tessema GA, Tessema ZT, Thankappan KR, Thapar R, Tolani MA, Tovani-Palone MR, Traini E, Tran BX, Tripathy JP, Tsapparellas G, Tsatsakis A, Tudor Car L, Uddin R, Ullah A, Umeokonkwo CD, Unim B, Unnikrishnan B, Upadhyay E, Usman MS, Vacante M, Vaezi M, Valadan Tahbaz S, Valdez PR, Vasankari TJ, Venketasubramanian N, Verma M, Violante FS, Vlassov V, Vo B, Vu GT, Wado YD, Waheed Y, Wamai RG, Wang Y, Wang Y, Wang YP, Ward P, Werdecker A, Westerman R, Wickramasinghe ND, Wilner LB, Wiysonge CS, Wu AM, Wu C, Xie Y, Yahyazadeh Jabbari SH, Yamagishi K, Yandrapalli S, Yaya S, Yazdi-Feyzabadi V, Yip P, Yonemoto N, Yoon SJ, Younis MZ, Yousefi Z, Yousefinezhadi T, Yu C, Yusuf SS, Zaidi SS, Zaman SB, Zamani M, Zamanian M, Zastrozhin MS, Zastrozhina A, Zhang Y, Zhang ZJ, Zhao XJG, Ziapour A, Hay SI, Murray CJL, Wang H, Kassebaum NJ. Global, regional, and national progress towards Sustainable Development Goal 3.2 for neonatal and child health: all-cause and cause-specific mortality findings from the Global Burden of Disease Study 2019. Lancet 2021; 398:870-905. [PMID: 34416195 PMCID: PMC8429803 DOI: 10.1016/s0140-6736(21)01207-1] [Citation(s) in RCA: 183] [Impact Index Per Article: 61.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Sustainable Development Goal 3.2 has targeted elimination of preventable child mortality, reduction of neonatal death to less than 12 per 1000 livebirths, and reduction of death of children younger than 5 years to less than 25 per 1000 livebirths, for each country by 2030. To understand current rates, recent trends, and potential trajectories of child mortality for the next decade, we present the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2019 findings for all-cause mortality and cause-specific mortality in children younger than 5 years of age, with multiple scenarios for child mortality in 2030 that include the consideration of potential effects of COVID-19, and a novel framework for quantifying optimal child survival. METHODS We completed all-cause mortality and cause-specific mortality analyses from 204 countries and territories for detailed age groups separately, with aggregated mortality probabilities per 1000 livebirths computed for neonatal mortality rate (NMR) and under-5 mortality rate (U5MR). Scenarios for 2030 represent different potential trajectories, notably including potential effects of the COVID-19 pandemic and the potential impact of improvements preferentially targeting neonatal survival. Optimal child survival metrics were developed by age, sex, and cause of death across all GBD location-years. The first metric is a global optimum and is based on the lowest observed mortality, and the second is a survival potential frontier that is based on stochastic frontier analysis of observed mortality and Healthcare Access and Quality Index. FINDINGS Global U5MR decreased from 71·2 deaths per 1000 livebirths (95% uncertainty interval [UI] 68·3-74·0) in 2000 to 37·1 (33·2-41·7) in 2019 while global NMR correspondingly declined more slowly from 28·0 deaths per 1000 live births (26·8-29·5) in 2000 to 17·9 (16·3-19·8) in 2019. In 2019, 136 (67%) of 204 countries had a U5MR at or below the SDG 3.2 threshold and 133 (65%) had an NMR at or below the SDG 3.2 threshold, and the reference scenario suggests that by 2030, 154 (75%) of all countries could meet the U5MR targets, and 139 (68%) could meet the NMR targets. Deaths of children younger than 5 years totalled 9·65 million (95% UI 9·05-10·30) in 2000 and 5·05 million (4·27-6·02) in 2019, with the neonatal fraction of these deaths increasing from 39% (3·76 million [95% UI 3·53-4·02]) in 2000 to 48% (2·42 million; 2·06-2·86) in 2019. NMR and U5MR were generally higher in males than in females, although there was no statistically significant difference at the global level. Neonatal disorders remained the leading cause of death in children younger than 5 years in 2019, followed by lower respiratory infections, diarrhoeal diseases, congenital birth defects, and malaria. The global optimum analysis suggests NMR could be reduced to as low as 0·80 (95% UI 0·71-0·86) deaths per 1000 livebirths and U5MR to 1·44 (95% UI 1·27-1·58) deaths per 1000 livebirths, and in 2019, there were as many as 1·87 million (95% UI 1·35-2·58; 37% [95% UI 32-43]) of 5·05 million more deaths of children younger than 5 years than the survival potential frontier. INTERPRETATION Global child mortality declined by almost half between 2000 and 2019, but progress remains slower in neonates and 65 (32%) of 204 countries, mostly in sub-Saharan Africa and south Asia, are not on track to meet either SDG 3.2 target by 2030. Focused improvements in perinatal and newborn care, continued and expanded delivery of essential interventions such as vaccination and infection prevention, an enhanced focus on equity, continued focus on poverty reduction and education, and investment in strengthening health systems across the development spectrum have the potential to substantially improve U5MR. Given the widespread effects of COVID-19, considerable effort will be required to maintain and accelerate progress. FUNDING Bill & Melinda Gates Foundation.
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Ryan PM. More than a Manuscript: The International Journal of Medical Students as an Educational Institution. Int J Med Students 2021. [DOI: 10.5195/ijms.2021.1092] [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: 11/20/2022] Open
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Sless RT, Hayward NE, Ryan PM, Deasy C, Dasari K. Emergency department attendances during the COVID-19 pandemic: a retrospective analysis of attendances following Irish governmental pandemic measures. Emerg Med J 2021; 38:439-445. [PMID: 33849939 PMCID: PMC8050875 DOI: 10.1136/emermed-2020-209992] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 02/20/2021] [Accepted: 03/20/2021] [Indexed: 11/03/2022]
Abstract
BACKGROUND COVID-19 has resulted in the death of over 1 million people to date. Following government-implemented regulations, there has been concern over the apparent decline in emergency department (ED) attendances and the resultant health legacy. Therefore, we aimed to characterise the attendances to an Irish tertiary hospital ED following the implementation of these regulations during the COVID-19 pandemic. METHODS This retrospective observational study investigated all attendances to the Cork University Hospital ED from 15 February to 11 April in 2020 and 2017-2019. Attendances were stratified into four periods: Before COVID (BC) (15 February to 5 March), After COVID (AC) (6 March to 12 March), Educational Closure (EC) (13 March to 27 March) and Stay Home (SH) (28 March to 11 April), as per government regulations. Triage presentations of abdominal pain, shortness of breath, chest pain, headache and trauma were examined. Data were analysed by independent t-tests and χ2 analysis. RESULTS There were 8261 attendances to the ED in the 2020 time period compared with a mean of 10 389 attendances during the corresponding periods in 2017-2019. There was a significant decrease in daily attendances in 2020 compared with 2017-2019 in the AC (142 vs 188, p=0.02), EC (122 vs 184, p<0.001) and SH (121 vs 181, p<0.001) periods, including significant decreases in abdominal pain (AC: 9 vs 22, EC: 10 vs 19, SH: 11 vs 18, p<0.001), chest pain (AC: 9 vs 15, EC: 8 vs 15, SH: 9 vs 15, p<0.01), headache (AC: 5 vs 11, EC: 4 vs 9, SH: 4 vs 9, p<0.01) and trauma (AC: 3 vs 5, EC: 2 vs 6, SH: 3 vs 5, p<0.01). CONCLUSION Our findings suggest that the combination of government-imposed restrictions and perceived risk of attending an ED during a pandemic may contribute to reduced attendances. Public confidence in EDs is necessary to reduce collateral damage caused by failure to seek medical attention during a pandemic; adequate infrastructure to allow social distancing and isolation capacity in EDs is a necessity.
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Affiliation(s)
- Ryan Taylor Sless
- School of Medicine, University College Cork, Cork City, Cork, Ireland
| | | | | | - Conor Deasy
- Emergency Medicine, Cork University Hospital, Cork City, Cork, Ireland
| | - Kantikiran Dasari
- Emergency Medicine, Cork University Hospital, Cork City, Cork, Ireland
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Kiss A, Ryan PM, Mondal T. Management of COVID-19-associated multisystem inflammatory syndrome in children: A comprehensive literature review. Prog Pediatr Cardiol 2021; 63:101381. [PMID: 33850412 PMCID: PMC8032479 DOI: 10.1016/j.ppedcard.2021.101381] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/12/2021] [Accepted: 04/05/2021] [Indexed: 02/06/2023]
Abstract
Background The prevalence and severity of COVID-19 are greatly reduced in children, yet some pediatric patients develop a syndrome resembling Kawasaki Disease (KD), termed Multisystem Inflammatory Syndrome in Children (MIS-C). With an estimated incidence of 2/100,000 children, MIS-C is relatively rare but can be fatal. Clinical features can include fever, hyperinflammatory state, gastrointestinal symptoms, myocardial dysfunction, and shock. The pathogenesis of MIS-C, although yet to be completely elucidated, appears to be distinct from KD in terms of epidemiology, severity, and biochemical signature. Aim of Review Although efficacy of treatments for MIS-C have largely not yet been investigated, we aim to conduct a comprehensive literature search of numerous medical databases (AMED, EBM Reviews, Embase, Healthstar, MEDLINE, ERIC, and Cochrane) to highlight treatments used around the world, their rationale, and outcomes to better inform guidelines in the future. Using the findings, an approach to MIS-C management will be outlined. Key Scientific Concepts of Review MIS-C appears to be a SARS-CoV-2 related post-infection phenomenon that is distinct from Kawasaki disease. Although outcomes are largely favorable, there is significant variation in MIS-C treatment. Most management regimens reported to date mirror that of KD; however, targeted therapy based on specific MIS-C phenotypes may have the potential to improve outcomes. We recommend close monitoring by a multidisciplinary team, symptomatic treatment (e.g., intravenous immunoglobulin for KD-like symptoms, steroids/immunotherapy for multisystem inflammation), and long-term follow-up. Further research is required to evaluate the effectiveness of current MIS-C treatments and to determine more refined therapies.
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Affiliation(s)
- Andreea Kiss
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Paul MacDaragh Ryan
- Brookfield School of Medicine and Health Sciences, University College Cork, Cork, Ireland
| | - Tapas Mondal
- Department of Pediatrics, McMaster Children's Hospital, Hamilton, ON, Canada
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Abstract
In order to best treat a patient, the carer must be able to clearly see their point of view. In the case of the complexities of insulin pump therapy, physicians may not fully understand the common challenges that drive patients to non-adherence. The author undertook a three-day simulation using wearable technology to explore this experience. This form of simulation represents a simple yet effective means by which to foster cognitive empathy in undergraduate and postgraduate medical education settings alike.
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Bonilla-Escobar FJ, Kumar AA, Farrugia-Bonnici G, Ryan PM, Găman MA. A Grain of Sand in the Ocean: Training New Generations of Editors, Reviewers, and Medical Scientists. Int J Med Students 2020. [DOI: 10.5195/ijms.2020.880] [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: 11/20/2022] Open
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Aronyk S, Ryan PM, O'Shea CA, Ryan CA. Waste not, want not: Donor human milk discard in infants is related to container size. Acta Paediatr 2020; 109:2592-2593. [PMID: 32484983 DOI: 10.1111/apa.15384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 03/07/2020] [Revised: 05/20/2020] [Accepted: 05/27/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Suzanne Aronyk
- Brookfield School of Medicine and Health, University College Cork, Cork, Ireland
| | - Paul MacDaragh Ryan
- Brookfield School of Medicine and Health, University College Cork, Cork, Ireland
| | - Carol-Ann O'Shea
- Department of Neonatology, Cork University Maternity Hospital, Cork, Ireland.,Department of Paediatrics and Child Health, University College Cork, Cork, Ireland
| | - Cornelius Anthony Ryan
- Department of Neonatology, Cork University Maternity Hospital, Cork, Ireland.,Department of Paediatrics and Child Health, University College Cork, Cork, Ireland
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Găman MA, Ryan PM, Bonilla-Escobar FJ. To Stay at Port or to Go to Sea: Are Clinical Clerkships a Double-Edged Sword During the COVID-19 Pandemic? Where Do We Go From Here? Int J Med Students 2020. [DOI: 10.5195/ijms.2020.715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Affiliation(s)
- Carl J Vaughan
- Department of Cardiology, Mercy University Hospital, Cork, Ireland
| | - Heather Cronin
- Department of Cardiology, Mercy University Hospital, Cork, Ireland
| | - Paul MacDaragh Ryan
- Centre for Research in Vascular Biology, APC Microbiome Institute, University College Cork, Cork, Ireland.,Department of Cardiology, Cork University Hospital, Cork, Ireland
| | - Noel M Caplice
- Centre for Research in Vascular Biology, APC Microbiome Institute, University College Cork, Cork, Ireland.,Department of Cardiology, Cork University Hospital, Cork, Ireland
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Ryan PM, Caplice NM. Is Adipose Tissue a Reservoir for Viral Spread, Immune Activation, and Cytokine Amplification in Coronavirus Disease 2019? Obesity (Silver Spring) 2020; 28:1191-1194. [PMID: 32314868 PMCID: PMC7264526 DOI: 10.1002/oby.22843] [Citation(s) in RCA: 210] [Impact Index Per Article: 52.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 04/15/2020] [Accepted: 04/15/2020] [Indexed: 01/08/2023]
Abstract
Coronavirus disease 2019 (COVID-19), the worst pandemic in more than a century, has claimed >125,000 lives worldwide to date. Emerging predictors for poor outcomes include advanced age, male sex, preexisting cardiovascular disease, and risk factors including hypertension, diabetes, and, more recently, obesity. This article posits new obesity-driven predictors of poor COVID-19 outcomes, over and above the more obvious extant risks associated with obesity, including cardiometabolic disease and hypoventilation syndrome in intensive care patients. This article also outlines a theoretical mechanistic framework whereby adipose tissue in individuals with obesity may act as a reservoir for more extensive viral spread, with increased shedding, immune activation, and cytokine amplification. This paper proposes studies to test this reservoir concept with a focus on specific cytokine pathways that might be amplified in individuals with obesity and COVID-19. Finally, this paper underscores emerging therapeutic strategies that might benefit subsets of patients in which cytokine amplification is excessive and potentially fatal.
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Affiliation(s)
- Paul MacDaragh Ryan
- Centre for Research in Vascular BiologyAPC Microbiome IrelandUniversity College CorkCork University HospitalCorkIreland
| | - Noel M. Caplice
- Centre for Research in Vascular BiologyAPC Microbiome IrelandUniversity College CorkCork University HospitalCorkIreland
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Ryan PM, Caplice N. COVID-19 and relative angiotensin-converting enzyme 2 deficiency: role in disease severity and therapeutic response. Open Heart 2020; 7:openhrt-2020-001302. [PMID: 32532804 PMCID: PMC7298719 DOI: 10.1136/openhrt-2020-001302] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/15/2020] [Indexed: 01/08/2023] Open
Affiliation(s)
| | - Noel Caplice
- Centre for Research in Vascular Biology, APC Microbiome Ireland, University College Cork, Cork, Ireland
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Ryan PM, Mondal T. Does domperidone prolong QTc in a clinically relevant manner in infants with GORD? Arch Dis Child 2020; 105:202-205. [PMID: 31594778 DOI: 10.1136/archdischild-2019-318183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 09/25/2019] [Accepted: 09/26/2019] [Indexed: 11/04/2022]
Affiliation(s)
| | - Tapas Mondal
- Division of Cardiology, Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada
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Sless RT, Hayward NE, Ryan PM, Kovacs-Litman A, Najeeb U. Lessons from across the pond: Student perspectives on the Internal Medicine clerkship experience at an Irish and Canadian medical school. MedEdPublish (2016) 2020; 9:16. [PMID: 38073846 PMCID: PMC10702639 DOI: 10.15694/mep.2020.000016.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023] Open
Abstract
This article was migrated. The article was marked as recommended. There is an increasing number of Canadians studying medicine outside of Canada, with a large cohort studying in Ireland. Studying abroad often means different foci in medical training which may make transitioning to residency in a different system more challenging. Students often enter North American elective rotations with little knowledge of student roles and responsibilities. This paper provides insight into the differences in learning objectives and student experiences in an Internal Medicine clerkship at a medical school in Canada and Ireland. Learning objectives are similar between systems; but there is an experiential discordance. In Ireland, clerks see many different patients, gaining exposure to a breadth of topics and clinical signs, but medical student presentations rarely inform decisions around patient care. In Canada, clerks have more direct patient responsibilities, performing physical examinations, reviewing investigations, writing progress notes, and devising management plans as part of their professional development. Overall, the Irish system places emphasis on the mastery of core clinical skills and maximizing breadth of patient exposure whereas the Canadian clerkship is more focused on graduated responsibility and formulating management plans, at the expense of some breadth of exposure. Such discrepancies may not affect the quality of residents, but are important considerations for Canadians studying abroad when repatriating for electives and residencies.
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Patterson E, Ryan PM, Wiley N, Carafa I, Sherwin E, Moloney G, Franciosi E, Mandal R, Wishart DS, Tuohy K, Ross RP, Cryan JF, Dinan TG, Stanton C. Gamma-aminobutyric acid-producing lactobacilli positively affect metabolism and depressive-like behaviour in a mouse model of metabolic syndrome. Sci Rep 2019; 9:16323. [PMID: 31704943 PMCID: PMC6841999 DOI: 10.1038/s41598-019-51781-x] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 09/20/2019] [Indexed: 12/22/2022] Open
Abstract
Metabolic and neuroactive metabolite production represents one of the mechanisms through which the gut microbiota can impact health. One such metabolite, gamma-aminobutyric acid (GABA), can modulate glucose homeostasis and alter behavioural patterns in the host. We previously demonstrated that oral administration of GABA-producing Lactobacillus brevis DPC6108 has the potential to increase levels of circulating insulin in healthy rats. Therefore, the objective of this study was to assess the efficacy of endogenous microbial GABA production in improving metabolic and behavioural outcomes in a mouse model of metabolic dysfunction. Diet-induced obese and metabolically dysfunctional mice received one of two GABA-producing strains, L. brevis DPC6108 or L. brevis DSM32386, daily for 12 weeks. After 8 and 10 weeks of intervention, the behavioural and metabolic profiles of the mice were respectively assessed. Intervention with both L. brevis strains attenuated several abnormalities associated with metabolic dysfunction, causing a reduction in the accumulation of mesenteric adipose tissue, increased insulin secretion following glucose challenge, improved plasma cholesterol clearance and reduced despair-like behaviour and basal corticosterone production during the forced swim test. Taken together, this exploratory dataset indicates that intervention with GABA-producing lactobacilli has the potential to improve metabolic and depressive- like behavioural abnormalities associated with metabolic syndrome in mice.
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Affiliation(s)
- E Patterson
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - P M Ryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - N Wiley
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - I Carafa
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland.,Department of Food Quality and Nutrition, Research and Innovation Centre-Fondazione Edmund Mach, San Michele all'Adige, Trento, Italy
| | - E Sherwin
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - G Moloney
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - E Franciosi
- Department of Food Quality and Nutrition, Research and Innovation Centre-Fondazione Edmund Mach, San Michele all'Adige, Trento, Italy
| | - R Mandal
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - D S Wishart
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada.,Department of Computing Science, University of Alberta, Edmonton, Alberta, Canada.,National Institute for Nanotechnology, Edmonton, Alberta, Canada
| | - K Tuohy
- Department of Food Quality and Nutrition, Research and Innovation Centre-Fondazione Edmund Mach, San Michele all'Adige, Trento, Italy
| | - R P Ross
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - J F Cryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - T G Dinan
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Department of Psychiatry and Neurobehavioural Science, University College Cork, Cork, Ireland
| | - C Stanton
- APC Microbiome Ireland, University College Cork, Cork, Ireland. .,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland.
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Ryan PM, Stanton C, Ross RP, Kelly AL, Dempsey E, Ryan CA. Paediatrician's perspective of infant gut microbiome research: current status and challenges. Arch Dis Child 2019; 104:701-705. [PMID: 31113768 DOI: 10.1136/archdischild-2019-316891] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 01/21/2019] [Revised: 03/26/2019] [Accepted: 03/27/2019] [Indexed: 01/16/2023]
Abstract
Due to its innately intriguing nature and recent genomic technological advances, gut microbiome research has been at the epicentre of medical research for over a decade now. Despite the degree of publicisation, a comprehensive understanding and, therefore, acceptance of the area as a whole may be somewhat lacking within the broader medical community. This paper summarises the main analytical techniques and tools currently applied to compositional microbiome research. In addition, we outline five major lessons learnt from a decade of infant microbiome research, along with the current research gaps. Finally, we aim to provide an introduction and general guidelines relating to infant gut microbiome research for the practising paediatrician.
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Affiliation(s)
| | - Catherine Stanton
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.,APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - R Paul Ross
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - Alan L Kelly
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Eugene Dempsey
- Department of Paediatrics and Child Health, University College Cork, Cork, Ireland.,Department of Neonatology, Cork University Maternity Hospital, Cork, Ireland
| | - C Anthony Ryan
- Department of Paediatrics and Child Health, University College Cork, Cork, Ireland.,Department of Neonatology, Cork University Maternity Hospital, Cork, Ireland
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Avelar Rodriguez D, Ryan PM, Toro Monjaraz EM, Ramirez Mayans JA, Quigley EM. Small Intestinal Bacterial Overgrowth in Children: A State-Of-The-Art Review. Front Pediatr 2019; 7:363. [PMID: 31552207 PMCID: PMC6737284 DOI: 10.3389/fped.2019.00363] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 08/20/2019] [Indexed: 12/11/2022] Open
Abstract
Small intestinal bacterial overgrowth (SIBO) is a heterogenous and poorly understood entity characterised by an excessive growth of select microorganisms within the small intestine. This excessive bacterial biomass, in turn, disrupts host physiology in a myriad of ways, leading to gastrointestinal and non-gastrointestinal symptoms and complications. SIBO is a common cause of non-specific gastrointestinal symptoms in children, such as chronic abdominal pain, abdominal distention, diarrhoea, and flatulence, amongst others. In addition, it has recently been implicated in the pathophysiology of stunting, a disease that affects millions of children worldwide. Risk factors such as acid-suppressive therapies, alterations in gastrointestinal motility and anatomy, as well as impoverished conditions, have been shown to predispose children to SIBO. SIBO can be diagnosed via culture-dependant or culture-independent approaches. SIBO's epidemiology is limited due to the lack of uniformity and consensus of its diagnostic criteria, as well as the paucity of literature available. Antibiotics remain the first-line treatment option for SIBO, although emerging modalities such as probiotics and diet manipulation could also have a role. Herein, we present a state-of-the-art-review which aims to comprehensively outline the most current information on SIBO in children, with particular emphasis on the gut microbiota.
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Affiliation(s)
- David Avelar Rodriguez
- Pediatric Gastroenterology and Nutrition Unit, National Institute of Pediatrics, Mexico City, Mexico
| | | | | | | | - Eamonn Martin Quigley
- Lynda K. and David M. Underwood Center for Digestive Disorders, Houston Methodist Hospital, Houston, TX, United States
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Ryan PM. The AIDS Frontline, PhD Reformation and Our Definition of Scientific Rigor - An Interview with Professor Arturo Casadevall. Int J Med Students 2018. [DOI: 10.5195/ijms.2018.337] [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: 11/20/2022] Open
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Avelar Rodriguez D, Peña Vélez R, Toro Monjaraz EM, Ramirez Mayans J, Ryan PM. The Gut Microbiota: A Clinically Impactful Factor in Patient Health and Disease. ACTA ACUST UNITED AC 2018. [DOI: 10.1007/s42399-018-0036-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Hayward NE, Ryan PM, Sless RT. Is it all in our Heads? The Role of CaMKII in Neurogenic Hypertension. Int J Med Students 2018. [DOI: 10.5195/ijms.2018.272] [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: 11/20/2022] Open
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Alberoni D, Baffoni L, Gaggìa F, Ryan PM, Murphy K, Ross PR, Stanton C, Di Gioia D. Impact of beneficial bacteria supplementation on the gut microbiota, colony development and productivity of Apis mellifera L. Benef Microbes 2018; 9:269-278. [PMID: 29380644 DOI: 10.3920/bm2017.0061] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Honey bees are important pollinators of several crops and ecosystems, having a great ecological and economic value. In Europe, the restricted use of chemicals and therapeutic agents in the beekeeping sector has stimulated the search for natural alternatives with a special focus on gut symbionts. The modulation of the gut microbiota has been recognised as a practical and successful approach in the entomological field for the management of insect-related problems. To date, only a few studies have investigated the effect of bacterial supplementation on the health status of colonies, colony productivity and gut symbionts. To this purpose, a preparation of sugar syrup containing bifidobacteria and lactobacilli isolated from bee gut was sprayed on the frames of an apiary located in open field once a week for four weeks. Treated and control hives were monitored for two months for brood extension, honey and pollen harvest. The presence of beneficial gut microorganisms within bee gut was investigated with denaturing gradient gel electrophoresis and next generation sequencing. The administered bacteria led to a significant increase of brood population (46.2%), pollen (53.4%) and harvestable honey in honey supers (59.21%). Analysis of the gut microbiota on the new generation of bees in treated hives showed an increase in relative abundance of Acetobacteraceae and Bifidobacterium spp., which are known to be involved in bee nutrition and protection.
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Affiliation(s)
- D Alberoni
- 1 Department of Agricultural Science, University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
| | - L Baffoni
- 1 Department of Agricultural Science, University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
| | - F Gaggìa
- 1 Department of Agricultural Science, University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
| | - P M Ryan
- 2 Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.,3 APC Microbiome Institute, University College Cork, Co. Cork, Ireland
| | - K Murphy
- 2 Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.,3 APC Microbiome Institute, University College Cork, Co. Cork, Ireland
| | - P R Ross
- 2 Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.,3 APC Microbiome Institute, University College Cork, Co. Cork, Ireland
| | - C Stanton
- 2 Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.,3 APC Microbiome Institute, University College Cork, Co. Cork, Ireland
| | - D Di Gioia
- 1 Department of Agricultural Science, University of Bologna, Viale Fanin 44, 40127 Bologna, Italy
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Lau C, Wilgen JB, Caughman JB, Hanson GR, Hosea J, Perkins R, Ryan PM, Taylor G. Using X-mode L, R and O-mode reflectometry cutoffs to measure scrape-off-layer density profiles for upgraded ORNL reflectometer on NSTX-U. Rev Sci Instrum 2014; 85:11D815. [PMID: 25430228 DOI: 10.1063/1.4889739] [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] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The pre-existing ORNL scrape-off-layer (SOL) reflectometer that operated with the X-mode R-cutoff at 6-27 GHz to measure SOL density profiles on NSTX is being upgraded to be functional at the increased magnetic fields on NSTX-U spherical tokamak. Rather than increasing the operating frequencies to measure the higher X-mode R-cutoff frequencies on NSTX-U, it will be shown that the combined use of the X-mode R, L and O-mode cutoffs at 6-27 GHz can obtain the desired SOL density profiles. The potential capabilities and obstacles of this technique to measure SOL density profiles and possibly SOL magnetic field profiles on NSTX-U will be discussed.
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Affiliation(s)
- C Lau
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J B Wilgen
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J B Caughman
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G R Hanson
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Hosea
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - R Perkins
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - P M Ryan
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G Taylor
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
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Perkins RJ, Hosea JC, Kramer GJ, Ahn JW, Bell RE, Diallo A, Gerhardt S, Gray TK, Green DL, Jaeger EF, Jaworski MA, LeBlanc BP, McLean A, Maingi R, Phillips CK, Roquemore L, Ryan PM, Sabbagh S, Taylor G, Wilson JR. High-harmonic fast-wave power flow along magnetic field lines in the scrape-off layer of NSTX. Phys Rev Lett 2012; 109:045001. [PMID: 23006093 DOI: 10.1103/physrevlett.109.045001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Indexed: 06/01/2023]
Abstract
A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast-wave heating and current drive.
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Affiliation(s)
- R J Perkins
- Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA.
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Green DL, Berry LA, Chen G, Ryan PM, Canik JM, Jaeger EF. Predicting high harmonic ion cyclotron heating efficiency in Tokamak plasmas. Phys Rev Lett 2011; 107:145001. [PMID: 22107201 DOI: 10.1103/physrevlett.107.145001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Indexed: 05/31/2023]
Abstract
Observations of improved radio frequency (rf) heating efficiency in ITER relevant high-confinement (H-)mode plasmas on the National Spherical Tokamak Experiment are investigated by whole-device linear simulation. The steady-state rf electric field is calculated for various antenna spectra and the results examined for characteristics that correlate with observations of improved or reduced rf heating efficiency. We find that launching toroidal wave numbers that give fast-wave propagation in the scrape-off plasma excites large amplitude (∼kV m(-1)) coaxial standing modes between the confined plasma density pedestal and conducting vessel wall. Qualitative comparison with measurements of the stored plasma energy suggests that these modes are a probable cause of degraded heating efficiency.
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Affiliation(s)
- D L Green
- Oak Ridge National Laboratory, Post Office Box 2008, Oak Ridge, Tennessee 37831-6169, USA.
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Ryan PM, Verhulst AS, Cott D, Romo-Negreira A, Hantschel T, Boland JJ. Optimization of multi-walled carbon nanotube-metal contacts by electrical stressing. Nanotechnology 2010; 21:045705. [PMID: 20009205 DOI: 10.1088/0957-4484/21/4/045705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present experimental data on the contact resistances of three different metal probes, tungsten, palladium and indium, with chemical vapour deposited (CVD) multi-wall carbon nanotubes (MWCNTs). We demonstrate that there is an irreversible modification of the contacts following electrical stressing whereby the circuit resistance converges towards its optimal value prior to current-induced tube failure. Once the probe-MWCNT contact is broken, subsequent recontact experiments reveal that the circuit resistance returns to its initial high level, demonstrating that the modification occurs at the probe contact location and not elsewhere in the circuit. Contact studies with the different metals reveal that Pd metal provides the lowest resistance contact to the MWCNT in our sample.
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Affiliation(s)
- P M Ryan
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Chemistry, Trinity College Dublin, Dublin 2, Republic of Ireland.
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Ryan PM, Teague LC, Naydenov B, Borland D, Boland JJ. Emergence and visualization of an interface state during contact formation with a single molecule. Phys Rev Lett 2008; 101:096801. [PMID: 18851635 DOI: 10.1103/physrevlett.101.096801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2008] [Indexed: 05/26/2023]
Abstract
Contact formation dynamics and electronic perturbations arising from the interaction of a metallic probe and a single molecule (1,3 cyclohexadiene) bound on the Si (100) surface are examined using a series of plane wave, density functional theory calculations. The approach of the probe induces a relaxation of the molecule that ultimately leads to the formation of an interface state due to a specific interaction between the probe apex atom and the C=C bond of the molecule. The calculated interface state is located 0.2 eV above the Fermi energy, in agreement with low temperature scanning tunneling spectroscopy local density of states data (0.35 eV), and is responsible for the contrast observed in low bias empty-state STM images.
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Affiliation(s)
- P M Ryan
- School of Chemistry and Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
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Mazzucato E, Smith DR, Bell RE, Kaye SM, Hosea JC, LeBlanc BP, Wilson JR, Ryan PM, Domier CW, Luhmann NC, Yuh H, Lee W, Park H. Short-scale turbulent fluctuations driven by the electron-temperature gradient in the national spherical torus experiment. Phys Rev Lett 2008; 101:075001. [PMID: 18764544 DOI: 10.1103/physrevlett.101.075001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Indexed: 05/26/2023]
Abstract
Measurements with coherent scattering of electromagnetic waves in plasmas of the National Spherical Torus Experiment indicate the existence of turbulent fluctuations in the range of wave numbers k perpendicular rho(e)=0.1-0.4, corresponding to a turbulence scale length nearly equal to the collisionless skin depth. Experimental observations and agreement with numerical results from a linear gyrokinetic stability code support the conjecture that the observed turbulence is driven by the electron-temperature gradient.
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Affiliation(s)
- E Mazzucato
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA.
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Ryan PM, Kelly JP, Chambers PL, Leonard BE. The toxicity profile of a single dose of paroxetine: an alternative approach to acute toxicity testing in the rat. Pharmacol Toxicol 2001; 88:59-66. [PMID: 11169163 DOI: 10.1034/j.1600-0773.2001.d01-84.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this study we have examined the effect of a single administration of the selective serotonin reuptake inhibitor, paroxetine (120-300 mg kg(-1), orally) in a recently developed rodent model of acute toxicity testing. Reduced body-weight, food consumption, water consumption and body temperature were observed in all paroxetine-treated groups, which were reversible within 7 days. Five days after administration, a dose-dependent increase in red blood cells, haemoglobin and haematocrit was observed with the 3 higher dose levels of paroxetine, which was significant in the 240 and 300 mg kg(-1) treatment groups (P < 0.05). Hyperactivity was apparent in the first 24 hr following treatment, as was evidence of the serotonin syndrome. When the animals were sacrificed (11 days after drug administration), an increase in liver weight was observed in the highest dose. These results are in agreement with those previously observed with paroxetine at the preclinical and clinical levels. They demonstrate that this rodent model, because of its multi-parameter nature, is a useful method for examining the consequences of a single high dose of an antidepressant drug.
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Affiliation(s)
- P M Ryan
- Department of Pharmacology, National University of Ireland, Galway
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Berch DB, Foley EJ, Hill RJ, Ryan PM. Extracting parity and magnitude from Arabic numerals: developmental changes in number processing and mental representation. J Exp Child Psychol 1999; 74:286-308. [PMID: 10552920 DOI: 10.1006/jecp.1999.2518] [Citation(s) in RCA: 156] [Impact Index Per Article: 6.2] [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: 11/22/2022]
Abstract
Children from Grades 2, 3, 4, 6, and 8 (7.8, 9.2, 9.8, 11.7, and 13. 6 years old, respectively) made speeded, bimanual parity (odd/even) judgments of the Arabic numerals 0-9. Analysis of response times indicated that from fourth grade on, parity information is retrieved directly from memory rather than being extracted by means of a mental calculation strategy. As early as Grade 3, children exhibited the SNARC (Spatial-Numerical Association of Response Codes) effect, where small numbers were responded to faster with the left hand than with the right hand, while the converse held true for large numbers. This finding, previously demonstrated only in adults, confirms that (a) children represent magnitude information in the form of a left-to-right oriented mental number line, and (b) this information is accessed obligatorily even when irrelevant. Finally, although the SNARC effect remained strong at Grade 4, it was attenuated at Grades 6 and 8 by a linguistic effect based on associations between the unmarked adjectives "even" and "right" and between the marked adjectives "odd" and "left."
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Affiliation(s)
- D B Berch
- U.S. Department of Education, Office of Educational Research and Improvement, Washington, DC 20208, USA.
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Abstract
Oxotremorine is a muscarinic receptor agonist that induces a variety of physiological and behavioural effects including hypothermia in mice. These effects are antagonized dose-dependently by classical anticholinergic compounds such as atropine. Although the oxotremorine-induced hypothermic response has been demonstrated in mice, few studies of the effects of this muscarinic agonist have been made in the rat. The following studies were made in male Sprague Dawley rats: 1. an investigation of the dose-response relationship between oxotremorine and hypothermia; 2. an examination of the effect of housing on the oxotremorine-induced hypothermic response, and 3, an investigation of the acute administration of various doses of atropine sulphate on the hypothermia caused by oxotremorine. The results indicate that the dose-response relationship between oxotremorine and the antagonism of hypothermia is similar in rat as it is in mice. The results also showed that this effect did not occur in group-housed animals.
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Affiliation(s)
- P M Ryan
- Department of Pharmacology, University College, Galway, Ireland
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Ryan PM. Epidemiology, etiology, diagnosis, and treatment of schizophrenia. Am J Hosp Pharm 1991; 48:1271-80. [PMID: 1677528] [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] [Indexed: 12/28/2022]
Abstract
The epidemiology, etiology, diagnosis, and treatment of schizophrenia are reviewed. In the United States, at least 1 in every 100 persons is afflicted with schizophrenia. The theory that schizophrenia is a biochemical disorder has gained wide acceptance, although none of the etiological theories are conclusive. Criteria contained in the Diagnostic and Statistical Manual of Mental Disorders, Third Edition, Revised, are most commonly used to diagnose schizophrenia. Accuracy in diagnosing schizophrenia is critical because the treatments and prognoses for different types of psychoses can vary considerably. Treatment primarily involves the use of antipsychotic drugs, which are thought to act by blocking central dopamine receptors. The classical antipsychotics are the phenothiazines; of these, the prototype is chlorpromazine. Other classes of antipsychotics are the thioxanthenes, butyrophenones, dihydroindolones, dibenzoxazepines, diphenylbutylpiperidines, and dibenzodiazepines. Selecting an appropriate agent involves consideration of adverse effects, dosage forms, and the agent's ability to relieve target symptoms. Adverse effects of these agents include sedation, extrapyramidal effects, and anticholinergic effects. Tardive dyskinesia is a serious, irreversible condition associated with long-term antipsychotic therapy. Clozapine, a newer atypical antipsychotic, has been shown to be more effective than chlorpromazine and haloperidol and seems to cause few neurological adverse effects. Treatment of schizophrenia has not changed much since the advent of antipsychotic drug use nearly 30 years ago. Newer atypical antipsychotics show promise in improving target symptoms while causing fewer adverse effects.
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Affiliation(s)
- P M Ryan
- Department of Pharmacy, University of Kentucky, Chandler Medical Center, Lexington 40504-0084
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Maquat LE, Chilcote R, Ryan PM. Human triosephosphate isomerase cDNA and protein structure. Studies of triosephosphate isomerase deficiency in man. J Biol Chem 1985; 260:3748-53. [PMID: 2579079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Nine cDNA clones of human adult liver triosephosphate (TP) isomerase have been isolated and characterized. All nine appear to be derived from a single mRNA species. DNA sequencing of one clone, designated pHTPI-5a, defined the last two nucleotides of the methionine initiation codon, the entire 744-nucleotide coding region of the mature polypeptide, and the entire 448-nucleotide 3' untranslated region. The frequency of TP isomerase clones in the cDNA library suggests that TP isomerase mRNA is present in adult liver at approximately 25 copies/cell. A single, low abundance TP isomerase mRNA species was detected in RNA isolated from normal human fibroblast cell lines. Analysis of TP isomerase mRNA levels in cultured fibroblasts of individuals that are homozygous for TP isomerase deficiency revealed normal levels in one and approximately 40% of normal levels in another. From this small patient sampling, it can be concluded that the genetic basis for TP isomerase deficiency is heterogeneous.
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Ryan PM, Whealton JH, Davis RC, Stirling WL, Tsai CC. A neutral beam sciopticon. Rev Sci Instrum 1979; 50:1160-1161. [PMID: 18699693 DOI: 10.1063/1.1136015] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A sciopticon based on the pinhole-camera effect is being used to determine individual beamlet contributions to the quality of neutral beams extracted from multiaperture ion sources. The technique outlined in this note can be used to study the effects on beam optics of nonhomogeneous source plasma density or acceleration gap nonuniformities, grid nonparallelism or aperture misplacement, and space-charge blowup or scattering in the neutralizer cell.
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Affiliation(s)
- P M Ryan
- Oak Ridge National Laboratory, Oak Ridge, Tennesse 37830, USA
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Stirling WL, Tsai CC, Haselton HH, Schechter DE, Whealton JH, Dagenhart WK, Davis RC, Gardner WL, Kim J, Menon MM, Ryan PM. Properties of an intense 40-kV neutral beam injector. Rev Sci Instrum 1979; 50:523. [PMID: 18699544 DOI: 10.1063/1.1135901] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The properties of an intense neutral beam injector, the modified duoPIGatron ion source, are discussed and compared with other injectors. For this source (a) beam composition for hydrogen is approximately (85+/-5) % monatomic, (b) nucleon gas efficiency is 50%, (c) the electrical efficiency of ion generation is 1.1 A/kW, and (d) up to 52% of the input power is delivered in the ion and neutral beam to a target subtending a half angle of 1.8 degrees x1.4 degrees .
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Affiliation(s)
- W L Stirling
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
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Stirling WL, Ryan PM, Tsai CC, Leung KN. Magnetic multipole line-cusp plasma generator for neutral beam injectors. Rev Sci Instrum 1979; 50:102. [PMID: 18699347 DOI: 10.1063/1.1135651] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The magnetic multipole line-cusp device developed by MacKenzie and associates has been adapted for use as a neutral beam ion source. It has produced high-density, large volume, quiescent, uniform hydrogen plasmas, which makes it a potential candidate for use as a plasma generator for neutral beam injectors. The device is a water-cooled cylindrical copper discharge chamber (25 cm in diameter by 36 cm long) with one end enclosed by a set of extraction grids with a 15-cm-diam multi-aperture pattern. The chamber wall serves as an anode and is surrounded by an external system of rare-earth cobalt magnets arranged in a line-cusp geometry of 12 cusps; plasma is produced by electron emission from a hot cathode assembly. This source has achieved extracted beam currents of 12 A at 18.5 kV, radial plasma density uniformities of +/-5% over a 15-cm diameter, noise levels of less than +/-0.5%, and arc efficiencies (beam current/arc power) of 0.6 A/kW.
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Affiliation(s)
- W L Stirling
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
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Symington RB, Marks SM, Ryan PM. Secretory cells of the human hypothalamus. S Afr Med J 1972; 46:1484-7. [PMID: 4118060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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McHenry MM, Smeloff EA, Fong WY, Miller GE, Ryan PM. Critical obstruction of prosthetic heart valves due to lipid absorption by Silastic. J Thorac Cardiovasc Surg 1970; 59:413-25. [PMID: 5415086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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