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BACKGROUND: The therapeutic effects of cannabinoid compounds have been the center of many investigations. This study provides a synthesis on all Cochrane systematic reviews (SRs) that assessed the use of cannabinoids as a therapeutic approach. DESIGN AND SETTING: Review of SRs, conducted in the Discipline of Evidence-Based Medicine, Escola Paulista de Medicina (EPM), Universidade Federal de São Paulo (UNIFESP). METHODS: A broad search was conducted in the Cochrane Database of Systematic Reviews to retrieve any Cochrane SRs that assessed the efficacy and safety of cannabinoids as a therapeutic approach. The results and key characteristics of all reviews included were summarized and discussed. RESULTS: Eight SRs were included. They assessed the use of cannabinoids for the following types of conditions: neurological (two SRs), psychiatric (two SRs), rheumatological (one SR), infectious (one SR) and oncological (two SRs). There was moderate-quality evidence showing that the use of cannabinoids reduced nausea and vomiting among adults, compared with placebo. Additionally, there was moderate-quality evidence showing that there was no difference between cannabinoids and prochlorperazine regarding the number of participants who reported vomiting, in this same population. CONCLUSIONS: This review identified eight Cochrane systematic reviews that provided evidence of unknown to moderate quality regarding the use of cannabinoids as a therapeutic intervention. Further studies are still imperative for solid conclusions to be reached regarding practical recommendations.

CONTEXT AND OBJECTIVE: Despite the high prevalence of vitamin D supplementation, its use remains controversial. The objective of this review was to identify and summarize the evidence from Cochrane systematic reviews regarding vitamin D supplementation for preventing ortreating any clinical condition. DESIGN AND SETTING: Review of systematic reviews, conducted in the Discipline of Evidence-Based Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo. METHODS: A search was conducted to identify all Cochrane systematic reviews that fulfilled the inclusion criteria. Titles and abstracts were screened by two authors. RESULTS: We included 27 Cochrane systematic reviews: 10 assessing use of vitamin D for prevention and 17 for treatment. The reviews found moderate to high quality of evidence regarding the benefit of vitamin D for pregnant women (prevention of adverse events: preterm birth risk [rate ratio, RR 0.36; 95% confidence interval, CI 0.14 to 0.93] and low birthweight risk [RR 0.40; 95% CI 0.24 to 0.67]) and for asthma patients (reduction of severe exacerbations [RR 0.63; 95% CI 0.45 to 0.88]). No benefit was found regarding vitamin D supplementation alone (without calcium) for preventing hip or any new fracture. For all other outcomes assessed under various conditions, the current quality of evidence is low or unknown, and therefore insufficient for any recommendation. CONCLUSION: Based on moderate to high quality of evidence, the Cochrane systematic reviews included here showed that there were some benefits from vitamin D supplementation for pregnant women and asthma patients and no benefits for preventing fractures.

BACKGROUND: Dementia is a highly prevalent condition worldwide. Its chronic and progressive presentation has an impact on physical and psychosocial characteristics and on public healthcare. Our aim was to summarize evidence from Cochrane reviews on non-pharmacological treatments for cognitive disorders and dementia. DESIGN AND SETTING: Review of systematic reviews, conducted in the Discipline of Evidence-Based Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo. METHODS: Cochrane reviews on non-pharmacological interventions for cognitive dysfunctions and/or type of dementia were included. For this, independent assessments were made by two authors. RESULTS: Twenty-four reviews were included. These showed that carbohydrate intake and validation therapy may be beneficial for cognitive disorders. For dementia, there is a potential benefit from physical activity programs, cognitive training, psychological treatments, aromatherapy, light therapy, cognitive rehabilitation, cognitive stimulation, hyperbaric oxygen therapy in association with donepezil, functional analysis, reminiscence therapy, transcutaneous electrical stimulation, structured decision-making on feeding options, case management approaches, interventions by non-specialist healthcare workers and specialized care units. No benefits were found in relation to enteral tube feeding, acupuncture, Snoezelen stimulation, respite care, palliative care team and interventions to prevent wandering behavior. CONCLUSION: Many non-pharmacological interventions for patients with cognitive impairment and dementia have been studied and potential benefits have been shown. However, the strength of evidence derived from these studies was considered low overall, due to the methodological limitations of the primary studies. RESUMO INTRODUÇÃO: Demência é uma condição com alta prevalência e incidência global. Sua característica crônica e progressiva tem impacto em aspectos físicos, psicossociais e na saúde pública. Nosso objetivo foi resumir evidências de revisões Cochrane sobre intervenções não farmacológicas para distúrbios cognitivos e demências. TIPO DE ESTUDO E LOCAL: Revisão de revisões sistemáticas conduzida na Disciplina de Medicina Baseada em Evidências da Escola Paulista de Medicina, Universidade Federal de São Paulo. MÉTODOS: Foram incluídas revisões Cochrane sobre intervenções não farmacológicas para disfunções cognitivas e/ou qualquer tipo de demência, após a avaliação realizada de forma independente por dois autores. RESULTADOS: Vinte e quatro revisões foram incluídas. As revisões mostraram que ingestão de carboidratos e a terapia de validação podem ser benéficas para distúrbios cognitivos. Para demência, existe benefício potencial de programas de atividade física, treino cognitivo, tratamentos psicológicos, aromaterapia, terapia com luz, reabilitação cognitiva, estimulação cognitiva, oxigenoterapia hiperbárica associada a donepezila, análise funcional, terapia de reminiscência, estimulação elétrica transcutânea, decisão estruturada em opções de alimentação, abordagem de gestão de casos e intervenções aplicadas por trabalhadores na área de saúde não especialistas e por unidades de cuidado especializado. Não foram encontrados benefícios para alimentação por sonda entérica, acupuntura, estimulação de Snoezelen, cuidados de repouso, equipe de cuidados paliativos e intervenções para prevenir comportamento de perambulação. CONCLUSÃO: Várias intervenções não farmacológicas para pacientes com comprometimento cognitivo e demência têm sido estudadas, mostrando benefícios potenciais. Entretanto, a força de evidência derivada desses estudos é em geral considerada baixa, devido às limitações metodológicas dos estudos primários.

CONTEXT AND OBJECTIVE: Autism spectrum disorders (ASDs) include autistic disorder, Asperger’s disorder and pervasive developmental disorder. The manifestations of ASDs can have an important impact on learning and social functioning that may persist during adulthood. The aim here was to summarize the evidence from Cochrane systematic reviews on interventions for ASDs. DESIGN AND SETTING: Review of systematic reviews, conducted within the Discipline of Evidence-Based Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo. METHODS: We included and summarized the results from Cochrane systematic reviews on interventions for ASDs. RESULTS: Seventeen reviews were included. These found weak evidence of benefits from acupuncture, gluten and casein-free diets, early intensive behavioral interventions, music therapy, parent-mediated early interventions, social skill groups, Theory of Mind cognitive model, aripiprazole, risperidone, tricyclic antidepressants and selective serotonin reuptake inhibitors (SSRI); this last only for adults. No benefits were found for sound therapies, chelating agents, hyperbaric oxygen therapy, omega-3, secretin, vitamin B6/magnesium and SSRI for children. CONCLUSION: Acupuncture, gluten and casein-free diets, early intensive behavioral interventions, music therapy, parent-mediated early interventions, social skill groups and the Theory of Mind cognitive model seem to have benefits for patients with autism spectrum disorders (very low to low-quality evidence). Aripiprazole, risperidone, tricyclic antidepressants and SSRI (this last only for adults) also showed some benefits, although associated with higher risk of adverse events. Experimental studies to confirm a link between probable therapies and the disease, and then high-quality long-term clinical trials, are needed. RESUMO CONTEXTO E OBJETIVO: Os transtornos do espectro autista (TEA) incluem autismo, doença de Asperger e transtorno global do desenvolvimento. As manifestações dos TEA podem ter importante impacto na aprendizagem e funcionamento social, que pode persistir durante a fase adulta. O objetivo foi resumir as evidências de revisões sistemáticas Cochrane sobre intervenções para TEA. TIPO DE ESTUDO E LOCAL: Revisão de revisões sistemáticas conduzida na Disciplina de Medicina Baseada em Evidências da Escola Paulista de Medicina, Universidade Federal de São Paulo. MÉTODOS: Nós incluímos e resumimos os resultados de revisões sistemáticas Cochrane sobre intervenções para TEA. RESULTADOS: Foram incluídas 17 revisões que encontraram evidências fracas de benefícios da acupuntura, dietas isentas de glúten e caseína, intervenção comportamental intensiva precoce, musicoterapia, intervenção precoce mediada pelos pais, grupos de habilidades sociais, modelo cognitivo de Teoria da Mente, aripiprazol, risperidona, antidepressivos tricíclicos, inibidores seletivos da recaptação da serotonina (ISRS); o último apenas para adultos. Nenhum benefício foi encontrado com terapias sonoras, agentes quelantes, oxigenoterapia hiperbárica, ômega-3, secretina, vitamina B6/magnésio e ISRS para crianças. CONCLUSÃO: Acupuntura, dietas sem glúten e caseína, intervenção comportamental intensiva precoce, musicoterapia, intervenção precoce mediada pelos pais, grupos de habilidades sociais e modelo cognitivo de Teoria da Mente parecem ter benefícios para pacientes com TEA (evidência de qualidade muito baixa a baixa). Aripiprazol, risperidona, antidepressivos tricíclicos e ISRS (o último apenas para adultos) também apresentam algum benefício, embora estejam associados a maior risco de eventos adversos. Estudos experimentais confirmando a relação entre prováveis terapias e a doença, e então ensaios clínicos de alta qualidade e de longo seguimento, são necessários.