A Systematic Review and Meta-analysis
01 Jan 2010-
TL;DR: A systematic review of studies published from January 1, 1950, through November 31, 2008 using PubMed, EMBASE, Web of Knowledge, CINAHL, and all Evidence-Based Medicine Reviews found that randomized clinical trials and prospective studies of RRTs that reported data on changes in the primary outcome of hospital mortality or the secondary outcome of cardiopulmonary arrest cases were included.
Abstract: Methods: We conducted a systematic review of studies published from January 1, 1950, through November 31, 2008, using PubMed, EMBASE, Web of Knowledge, CINAHL, and all Evidence-Based Medicine Reviews. Randomized clinical trials and prospective studies of RRTs that reported data on changes in the primary outcome of hospital mortality or the secondary outcome of cardiopulmonary arrest cases were included.
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TL;DR: In this paper, the authors estimated deaths and disability-adjusted life years (DALYs; sum of years lived with disability [YLD] and years of life lost [YLL]) attributable to the independent effects of 67 risk factors and clusters of risk factors for 21 regions in 1990 and 2010.
9,324 citations
TL;DR: An expert panel was convened in October 2013 by the International Scientific Association for Probiotics and Prebiotics (ISAPP) to discuss the field of probiotics and the appropriate use and scope of the term probiotic.
Abstract: An expert panel was convened in October 2013 by the International Scientific Association for Probiotics and Prebiotics (ISAPP) to discuss the field of probiotics. It is now 13 years since the definition of probiotics and 12 years after guidelines were published for regulators, scientists and industry by the Food and Agriculture Organization of the United Nations and the WHO (FAO/WHO). The FAO/WHO definition of a probiotic--"live microorganisms which when administered in adequate amounts confer a health benefit on the host"--was reinforced as relevant and sufficiently accommodating for current and anticipated applications. However, inconsistencies between the FAO/WHO Expert Consultation Report and the FAO/WHO Guidelines were clarified to take into account advances in science and applications. A more precise use of the term 'probiotic' will be useful to guide clinicians and consumers in differentiating the diverse products on the market. This document represents the conclusions of the ISAPP consensus meeting on the appropriate use and scope of the term probiotic.
5,114 citations
TL;DR: It is demonstrated that metabolism by intestinal microbiota of dietary l-carnitine, a trimethylamine abundant in red meat, also produces TMAO and accelerates atherosclerosis in mice, and intestinal microbiota may contribute to the well-established link between high levels of red meat consumption and CVD risk.
Abstract: Intestinal microbiota metabolism of choline and phosphatidylcholine produces trimethylamine (TMA), which is further metabolized to a proatherogenic species, trimethylamine-N-oxide (TMAO). We demonstrate here that metabolism by intestinal microbiota of dietary L-carnitine, a trimethylamine abundant in red meat, also produces TMAO and accelerates atherosclerosis in mice. Omnivorous human subjects produced more TMAO than did vegans or vegetarians following ingestion of L-carnitine through a microbiota-dependent mechanism. The presence of specific bacterial taxa in human feces was associated with both plasma TMAO concentration and dietary status. Plasma L-carnitine levels in subjects undergoing cardiac evaluation (n = 2,595) predicted increased risks for both prevalent cardiovascular disease (CVD) and incident major adverse cardiac events (myocardial infarction, stroke or death), but only among subjects with concurrently high TMAO levels. Chronic dietary L-carnitine supplementation in mice altered cecal microbial composition, markedly enhanced synthesis of TMA and TMAO, and increased atherosclerosis, but this did not occur if intestinal microbiota was concurrently suppressed. In mice with an intact intestinal microbiota, dietary supplementation with TMAO or either carnitine or choline reduced in vivo reverse cholesterol transport. Intestinal microbiota may thus contribute to the well-established link between high levels of red meat consumption and CVD risk.
3,222 citations
TL;DR: I. Screening and management of chronic complications in children and adolescents with type 1 diabetes i.e., screenings for type 2 diabetes and risk of future diabetes in adults, and strategy for improving diabetes care in the hospital, are outlined.
Abstract: I. CLASSIFICATION AND DIAGNOSIS OF DIABETES, p. S12 A. Classification of diabetes B. Diagnosis of diabetes C. Categories of increased risk for diabetes (prediabetes) II. TESTING FOR DIABETES IN ASYMPTOMATIC PATIENTS, p. S13 A. Testing for type 2 diabetes and risk of future diabetes in adults B. Testing for type 2 diabetes in children C. Screening for type 1 diabetes III. DETECTION AND DIAGNOSIS OF GESTATIONAL DIABETES MELLITUS, p. S15 IV. PREVENTION/DELAY OF TYPE 2 DIABETES, p. S16 V. DIABETES CARE, p. S16 A. Initial evaluation B. Management C. Glycemic control 1. Assessment of glycemic control a. Glucose monitoring b. A1C 2. Glycemic goals in adults D. Pharmacologic and overall approaches to treatment 1. Therapy for type 1 diabetes 2. Therapy for type 2 diabetes E. Diabetes self-management education F. Medical nutrition therapy G. Physical activity H. Psychosocial assessment and care I. When treatment goals are not met J. Hypoglycemia K. Intercurrent illness L. Bariatric surgery M. Immunization VI. PREVENTION AND MANAGEMENT OF DIABETES COMPLICATIONS, p. S27 A. Cardiovascular disease 1. Hypertension/blood pressure control 2. Dyslipidemia/lipid management 3. Antiplatelet agents 4. Smoking cessation 5. Coronary heart disease screening and treatment B. Nephropathy screening and treatment C. Retinopathy screening and treatment D. Neuropathy screening and treatment E. Foot care VII. DIABETES CARE IN SPECIFIC POPULATIONS, p. S38 A. Children and adolescents 1. Type 1 diabetes Glycemic control a. Screening and management of chronic complications in children and adolescents with type 1 diabetes i. Nephropathy ii. Hypertension iii. Dyslipidemia iv. Retinopathy v. Celiac disease vi. Hypothyroidism b. Self-management c. School and day care d. Transition from pediatric to adult care 2. Type 2 diabetes 3. Monogenic diabetes syndromes B. Preconception care C. Older adults D. Cystic fibrosis–related diabetes VIII. DIABETES CARE IN SPECIFIC SETTINGS, p. S43 A. Diabetes care in the hospital 1. Glycemic targets in hospitalized patients 2. Anti-hyperglycemic agents in hospitalized patients 3. Preventing hypoglycemia 4. Diabetes care providers in the hospital 5. Self-management in the hospital 6. Diabetes self-management education in the hospital 7. Medical nutrition therapy in the hospital 8. Bedside blood glucose monitoring 9. Discharge planning IX. STRATEGIES FOR IMPROVING DIABETES CARE, p. S46
2,827 citations
TL;DR: The medical profession should play a central role in evaluating the evidence related to drugs, devices, and procedures for the detection, management, and prevention of disease.
Abstract: Preamble 2072
1. Introduction 2074
2. Clinical Characteristics and Evaluation of AF 2076
3. Thromboembolic Risk and Treatment 2077
4. Rate Control: Recommendations 2079
5. Rhythm Control: Recommendations 2080
6. Specific Patient Groups and AF: Recommendations 2086
7. Evidence Gaps and Future Research Directions 2089
References 2090
Appendix 1. Author Relationships With Industry and Other Entities (Relevant) 2095
Appendix 2. Reviewer Relationships With Industry and Other Entities (Relevant) 2097
Appendix 3. Initial Clinical Evaluation in Patients With AF 2104
The medical profession should play a central role in evaluating the evidence related to drugs, devices, and procedures for the detection, management, and prevention of disease. When properly applied, expert analysis of available data on the benefits and risks of these therapies and procedures can improve the quality of care, optimize patient outcomes, and favorably affect costs by focusing resources on the most effective strategies. An organized …
2,192 citations
References
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TL;DR: A new quantity is developed, I 2, which the authors believe gives a better measure of the consistency between trials in a meta-analysis, which is susceptible to the number of trials included in the meta- analysis.
Abstract: Cochrane Reviews have recently started including the quantity I 2 to help readers assess the consistency of the results of studies in meta-analyses. What does this new quantity mean, and why is assessment of heterogeneity so important to clinical practice?
Systematic reviews and meta-analyses can provide convincing and reliable evidence relevant to many aspects of medicine and health care.1 Their value is especially clear when the results of the studies they include show clinically important effects of similar magnitude. However, the conclusions are less clear when the included studies have differing results. In an attempt to establish whether studies are consistent, reports of meta-analyses commonly present a statistical test of heterogeneity. The test seeks to determine whether there are genuine differences underlying the results of the studies (heterogeneity), or whether the variation in findings is compatible with chance alone (homogeneity). However, the test is susceptible to the number of trials included in the meta-analysis. We have developed a new quantity, I 2, which we believe gives a better measure of the consistency between trials in a meta-analysis.
Assessment of the consistency of effects across studies is an essential part of meta-analysis. Unless we know how consistent the results of studies are, we cannot determine the generalisability of the findings of the meta-analysis. Indeed, several hierarchical systems for grading evidence state that the results of studies must be consistent or homogeneous to obtain the highest grading.2–4
Tests for heterogeneity are commonly used to decide on methods for combining studies and for concluding consistency or inconsistency of findings.5 6 But what does the test achieve in practice, and how should the resulting P values be interpreted?
A test for heterogeneity examines the null hypothesis that all studies are evaluating the same effect. The usual test statistic …
45,105 citations
TL;DR: This paper examines eight published reviews each reporting results from several related trials in order to evaluate the efficacy of a certain treatment for a specified medical condition and suggests a simple noniterative procedure for characterizing the distribution of treatment effects in a series of studies.
33,234 citations
TL;DR: A checklist contains specifications for reporting of meta-analyses of observational studies in epidemiology, including background, search strategy, methods, results, discussion, and conclusion should improve the usefulness ofMeta-an analyses for authors, reviewers, editors, readers, and decision makers.
Abstract: ObjectiveBecause of the pressure for timely, informed decisions in public health
and clinical practice and the explosion of information in the scientific literature,
research results must be synthesized. Meta-analyses are increasingly used
to address this problem, and they often evaluate observational studies. A
workshop was held in Atlanta, Ga, in April 1997, to examine the reporting
of meta-analyses of observational studies and to make recommendations to aid
authors, reviewers, editors, and readers.ParticipantsTwenty-seven participants were selected by a steering committee, based
on expertise in clinical practice, trials, statistics, epidemiology, social
sciences, and biomedical editing. Deliberations of the workshop were open
to other interested scientists. Funding for this activity was provided by
the Centers for Disease Control and Prevention.EvidenceWe conducted a systematic review of the published literature on the
conduct and reporting of meta-analyses in observational studies using MEDLINE,
Educational Research Information Center (ERIC), PsycLIT, and the Current Index
to Statistics. We also examined reference lists of the 32 studies retrieved
and contacted experts in the field. Participants were assigned to small-group
discussions on the subjects of bias, searching and abstracting, heterogeneity,
study categorization, and statistical methods.Consensus ProcessFrom the material presented at the workshop, the authors developed a
checklist summarizing recommendations for reporting meta-analyses of observational
studies. The checklist and supporting evidence were circulated to all conference
attendees and additional experts. All suggestions for revisions were addressed.ConclusionsThe proposed checklist contains specifications for reporting of meta-analyses
of observational studies in epidemiology, including background, search strategy,
methods, results, discussion, and conclusion. Use of the checklist should
improve the usefulness of meta-analyses for authors, reviewers, editors, readers,
and decision makers. An evaluation plan is suggested and research areas are
explored.
17,663 citations
TL;DR: A task force of the International Liaison Committee on Resuscitation (ILCOR) met in Melbourne, Australia, to review worldwide experience with the Utstein definitions and reporting templates as mentioned in this paper.
Abstract: Outcome after cardiac arrest and cardiopulmonary resuscitation is dependent on critical interventions, particularly early defibrillation, effective chest compressions, and advanced life support. Utstein-style definitions and reporting templates have been used extensively in published studies of cardiac arrest, which has led to greater understanding of the elements of resuscitation practice and progress toward international consensus on science and resuscitation guidelines. Despite the development of Utstein templates to standardize research reports of cardiac arrest, international registries have yet to be developed. In April 2002, a task force of the International Liaison Committee on Resuscitation (ILCOR) met in Melbourne, Australia, to review worldwide experience with the Utstein definitions and reporting templates. The task force revised the core reporting template and definitions by consensus. Care was taken to build on previous definitions, changing data elements and operational definitions only on the basis of published data and experience derived from those registries that have used Utstein-style reporting. Attention was focused on decreasing the complexity of the existing templates and addressing logistical difficulties in collecting specific core and supplementary (ie, essential and desirable) data elements recommended by previous Utstein consensus conferences. Inconsistencies in terminology between in-hospital and out-of-hospital Utstein templates were also addressed. The task force produced a reporting tool for essential data that can be used for both quality improvement (registries) and research reports and that should be applicable to both adults and children. The revised and simplified template includes practical and succinct operational definitions. It is anticipated that the revised template will enable better and more accurate completion of all reports of cardiac arrest and resuscitation attempts. Problems with data definition, collection, linkage, confidentiality, management, and registry implementation are acknowledged and potential solutions offered. Uniform collection and tracking of registry data should enable better continuous quality improvement within every hospital, emergency medical services system, and community.
2,277 citations
Book•
19 Dec 2000
TL;DR: This book discusses meta-analysis's development and uses, and discusses Bayesian methods in Meta-analysis, as well as specific and developing areas of applications inMeta-Analysis.
Abstract: PART A: META-ANALYSIS METHODOLOGY: THE BASICS Introduction: Meta-analysis: Its Development and Uses Defining Outcome Measures used for Combining via Meta-analysis Random Effects Models for Combining Study Estimates Exploring Between Study Heterogeneity Publication Bias Study Quality Sensitivity Analysis Reporting the Results of a Meta-analysis Fixed Effects Methods for Combining Study Estimates PART B: ADVANCED AND SPECIALIZED META-ANALYSIS TOPICS Bayesian Methods in Meta-analysis Meta Regression Meta-analysis of Different Types of Data Incorporating Study Quality into a Meta-analysis Meta-analysis of Multiple and Correlated Outcome Measures Meta-analysis of Epidemiological and other Observational Studies Generalised Synthesis of Evidence - Combining Different Sources of Evidence Meta-analysis of Survival Data Cumulative Meta-analysis Miscellaneous and Developing Areas of Applications in Meta-Analysis Appendix I: Software Used for the Examples in this Book
1,738 citations