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SYSTEMATIC REVIEW ON THE EFFECTS OF ANTIINFLAMMATORY ASTHMA MEDICATION ON FENO VALUES Class 19 FMUP 2008/2009 Adviser: Dr. João Fonseca
INDEX Statement of the Problem Background Main Problem Aims Methods Expected Results References
STATEMENT OF THE PROBLEM ▫ Asthma is a disease with high prevalence and morbidity 1; ▫ There are different types of Asthma Medication, some have anti-inflammatory effects; ▫ FENO is a biomarker of airways’ inflammation. What are the effect of anti-inflammatory asthma medication on FENO values? 1 GLOBAL INITIATIVE FOR ASTHMA
BACKGROUND • WHAT IS ASTHMA? Asthma is a chronic inflammatory disorder of the airways. 1 1 GLOBAL INITIATIVE FOR ASTHMA 2006
BACKGROUND o ASTHMA MEDICATION 2: Antiinflammatory Agent Leukotriene Antagonists Drugs Montelukast Zafirlukast Zileuton Fluticasone Budesonide Inhaled Glucocorticoids Triamcinolone Flunisolide Beclomethasone Mometasone Oral Glucocorticoids Prednisone Methylprednisolone Hydrocortisone 2 National Heart, Lung, and Blood Institute; National Asthma Education and Prevention Program
BACKGROUND • WHAT IS NITRIC OXIDE? - It’s a gas produced by cells that line the inner wall of the airways; - The amount of nitric oxide exhaled shows how much inflammation there is in the lungs. 3 3 JONGSTE J. C. 2005
MAIN PROBLEM • Normal values of FENO aren’t clearly defined; • FENO values are influenced by demographic and biological factors; • Some effects of anti-asthma medication on FENO values have been reported.
AIMS • Evaluate the effect of anti-inflammatory asthma medication and its magnitude on FENO values, namely: ▫ Leukotriene modifiers; ▫ Inhaled Corticosteroids; ▫ Oral Corticosteroids;
METHODS • STUDY DESIGN: SYSTEMATIC REVIEW Phases of a systematic review: 1. Formulation of the Question 2. Search and inclusion of primary studies 3. Quality assessment of included studies 4. Data Extraction 5. Statistical Analysis and synthesis of study results 6. Interpretation of the results and report writing
METHODS 2. Search and Inclusion of primary studies: • DATA SOURCE: PUBMED SCOPUS ISI Web of Knowledge Conduction of separate, sensitive searches using different combination of multiple and alternative keywords
METHODS 2. Selection and Inclusion of primary studies: INCLUSION OF PRIMARY STUDIES ACCORDING TO THE INCLUSION AND EXCLUSION CRITERIA: Search PUBMED SCOPUS ISI Total 1 183 71 107 359 2 183 71 96 350 3 217 73 111 401 4 259 151 371 781 5 239 147 233 619 6 230 114 458 7 230 114 458 6: 4: exhaled nitric oxide AND (glucocorticoids. ANDLeukotrieneantagonists OR 2: asthma AND exhaled nitric oxide AND (glucocorticoids ORantagonists); 5: 3: 1: (exhaled nitric oxide OR FENO OR ENO) OR leukotriene Leukotriene 7: (glucocorticoids OR OR Montelukast OR limits: since antagonists OR Montelukast OR Zafirlukast OR Zileuton OR antagonists) 1990 Zafirlukast Zileuton OR Fluticasone OR Budesonide OR Montelukast limits: since 1990 antagonists); OR Zafirlukast OR OR Zileuton OR Fluticasone OR leukotriene Budesonide OR Triamcinolone. ORTriamcinolone OR OR Mometasone. OR Fluticasone OR Budesonide OR Flunisolide OR Beclomethasone Budesonide OR Triamcinolone OR Flunisolide OR Beclomethasone OR Triamcinolone OR Flunisolide. OR Beclomethasone Flunisolide OR OR Mometasone OR Prednisone OR Methylprednisolone OR Hydrocortisone); Beclomethasone Mometasone 1990, OR Mometasone OR Hydrocortisone); Prednisone OR Methylprednisolone. OR Prednisone OR Methylprednisolone limits: since OR Prednisone since 1990, HUMANS, CLINICAL QUERY -1990 HUMANS OR Methylprednisolone OR limits: since OR Hydrocortisone); limits: since 1990, HUMANS, CLINICAL QUERY - Teraphy and sensitive Therapy and sensitive search
METHODS 2. Selection and Inclusion of primary studies: ▫ Selection of the Query: (Exhaled Nitric Oxide OR FENO OR ENO) AND (Leukotriene Antagonists OR Glucocorticoids OR Montelukast OR Zafirlukast OR Zileuton OR Fluticasone OR Budesonide OR Triamcinolone OR Flunisolide OR Beclomethasone OR Mometasone OR Prednisone OR Methylprednisolone OR Hydrocortisone) Ø LIMITS: • articles published since 1990 (except on ISI); • data collected on HUMANS - PUBMED, [AND (humans OR patients OR volunteers) – SCOPUS and ISI; • Clinical Queries: Therapy and Sensitive Search – PUBMED, [AND clinical trial OR therapy OR “therapeutic use”] – SCOPUS and ISI.
METHODS 2. Selection and Inclusion of primary studies: INCLUSION OF PRIMARY STUDIES ACCORDING TO THE INCLUSION AND EXCLUSION CRITERIA: Screen of articles independently by two reviewers and selection of those appropriate for inclusion. • Assessing Title/Abstract • When there isn’t sufficient information, the article will proceed to the next phase • When the reviewers disagree on the inclusion or exclusion of an article, the article is automatically included • Assessing Full-text • When the two reviewers disagree on the inclusion or exclusion of a specific article, the disagreement will be solved by consensus or request of a third reviewer; • The articles which don’t accomplish the criteria will be excluded and the reasons for that exclusion will be registered. Ø
METHODS 2. Selection and Inclusion of primary studies: § INCLUSION OF PRIMARY STUDIES ACCORDING TO THE INCLUSION AND EXCLUSION CRITERIA: Inclusion Criteria: - Explicit comparison of FENO values in patients treated with antiinflammatory medication with the values in the same patients not on treatment; -related to the effects of Oral Corticosteroids, Inhaled Corticosteroids or Leukotriene modifiers on FENO values; - a experimental longitudinal study; - primary data; - published since 1990. § Exclusion Criteria: - in a language either than English, Portuguese or Spanish; - studies without a rigorous definition about the existence or not of asthma in the patients, at the beginning of the treatment. - Not analyzed on humans;
METHODS 3. Quality Assessment of included studies • • • Quality refers to internal validity of the studies (i. e. lack of bias). This task should also be performed independently by two reviewers basing on a list with selection criteria. The quality criteria used will depend on the study design, in our case, selection criteria are, for example, “Were patients randomized? ”, “Was follow up complete? ”, etc.
METHODS 4. Data Extraction: • Reviewers will extract information on the characteristics of the study, such as its methodology, population, interventions and outcomes. • Variables extracted from each article will be: • Study Identification - Author; - Year; - Nationality. • Type of Study (Longitudinal – Retrospective or Prospective) • Study’s Objective
METHODS 4. Data Extraction: • Study Variables: ØPatients: - Number of participants; - Age (children, adults); - Sex (Male or Female); - Health Condition; ØIntervention: -Type of anti-inflammatory treatment (Leukotriene Antagonists or Glucocorticoids) - Treatment duration (0 -4 weeks; or 4 weeks to 6 months; or 6 to 12 months; or more then a year) - Use of Control or Placebo Groups. ØComparation: - Of evolution of FENO values: Between two or more different asthma medication; Between treated and not treated groups of patients. ØOutcomes: - Treatment influence on FENO values (FENO values before and after the treatment); - Development of new sensitivities in patient groups and type of sensitivity developed (if developed).
METHODS 5. Statistical Analysis and synthesis of study results • Tabulation of study characteristics and results. It will made a statistical analysis and it will be used SPSS for the descriptive statistics proportion. • Meta-analysis : combination of the results of previous studies to achieve at summary conclusions. 6. Interpretation of the results and report writing: • Interpretation of results, discussion of issues and limitations of primary studies included and the conduction of the review;
EXPECTED RESULTS • Find enough data that relates the different drugs that compose three types of anti-inflammatory asthma medication (Leukotriene modifiers, inhaled Corticosteroids and oral Corticosteroids) to variations in FENO values; • Literature will show a decrease in the FENO values of patients treated with anti-inflammatory asthma medication.
REFERENCES 1) Global Initiative for Asthma, A Pocket Guide for Physicians and Nurses, 2006 2) National Heart, Lung, and Blood Institute; National Asthma Education and Prevention Program. Expert Panel Report 3: Guidelines for the Diagnosis and Management of Asthma. 2007. 08 -4051 http: //adam. about. com/reports/Asthma-in-adults. htm 3) Jongste J. C. Yes to NO: The First Studies on Exhaled Nitric Oxide-Driven Asthma Treatment, 2005, ERS Journal Ltd, 26: 379 -381 4) Madhukar P, Systematic reviews and meta-analyses: An illustrated, step-by-step guide, The National Medical Journal of India VOL. 17, NO. 2, 2004 5) Oddera S. , Silvestri M, Balbo A, Jovovich BO, Penna R, Crimmi E, Rossi GA, Airway eosinophilic inflammation, epithelial damage, and bronchial hiperresponsiveness in patients with mild-moderate, stable asthma, 1996, 51(2): 100 -7 6) Consumers Union, Steroid Inhalers Used to Treat Asthma and Chronic Lung Disease, Consumer Reports Best Buy Drugs, Abril 2006 7) Smith AD, Cowan JO, Brasset KP, Herbison P, Taylor DR, Use of exhaled nitric oxide measurements to guide treatment in chronic asthma, N Engl J Med, 2005; 352(21): 2163 -73 8) Buchvald F, Baraldi E, Carraro S, et al. Measurements of exhaled nitric oxide in healthy subjects age 4 to 17 years, J Allergy Clin Immunol 2005; 115: 1130– 1136 9) Pijnenburg W. , Hofhuis W. , Hop C. , Jongste J. C. , Exhaled nitric oxide predicts asthma relapse in children with clinical asthma remission, Thorax 2005; 60: 215– 218 10) Stirling RG, Kharitonov SA, Campbell D, Robinson DS, Durham SR, Chung KF, Barnes PJ, Increase in exhaled nitric oxide levels in patients with difficult asthma and correlation with symptoms and disease severity despite treatment with oral and inhaled corticosteroids. Asthma and Allergy Group, Thorax. 1998 Dec; 53(12): 1030 -4. 11) National Heart Lumb and Blood Institute, Asthma, September 2008, http: //www. nhlbi. nih. gov/health/dci/Diseases/Asthma_What. Is. html 12) MEDLINE Plus, Asthma, http: //www. nlm. nih. gov/medlineplus/asthma. html