METHODS: In this cross-over study, study participants were randomized to perform the initial peak expiratory flow (PEF) measurement in either standing or sitting position. The highest of three readings in each position were compared using paired t-test. A mean difference of
OBJECTIVES: To assess the benefits and harms of statins as an adjunct therapy for asthma in adults and children.
SEARCH METHODS: We searched for studies in the Cochrane Airways Trials Register, the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE Ovid SP and Embase Ovid SP, from their inception dates We handsearched the proceedings of major respiratory conferences. We also searched clinical trials registries for completed, ongoing and unpublished studies, and scanned the reference lists of included studies and relevant reviews to identify additional studies. The search is current to 7 February 2020.
SELECTION CRITERIA: We included randomised controlled trials (RCTs) with a parallel-group design that assessed statins for at least 12 weeks' duration. We considered all participants with a clinical diagnosis of asthma to be eligible, regardless of age, sex, disease severity and previous or current treatment. We planned to include studies reported as full text, those published as abstract only, and unpublished data.
DATA COLLECTION AND ANALYSIS: Two review authors independently screened and selected the studies, extracted outcome data and intervention characteristics from included studies, and assessed risk of bias according to standard Cochrane methodological procedures. We resolved any disagreement through discussion.
MAIN RESULTS: We found only one trial involving a total of 60 people living with asthma. The trial compared the effect of atorvastatin with a placebo (dummy treatment containing lactose) in treating people with chronic asthma. The trial did not report data for the primary outcomes or adverse events. There was uncertainty about the relative effect on forced expiratory volume in one second (FEV1) and peak expiratory flow (PEF) in the atorvastatin group compared with the placebo group. The study did not report serious adverse effects for the interventions. The included study had internal discrepancies in its reported data.
AUTHORS' CONCLUSIONS: The evidence was of very low certainty, so we are unable to draw conclusions about the effectiveness and safety of statins to treat asthma. High-quality RCTs are needed to assess the effect of statins on people with asthma. Well-designed multicentre trials with larger samples and longer duration of treatment are required, which assess outcomes such as adverse events, hospital utilisation and costs, to provide better quality evidence. Future studies that include subgroups of obese people with asthma are also required.
OBJECTIVE: The present systematic review aimed to investigate the potential role of home visits in improving outcomes among adult patients with asthma.
METHODS: The systematic review was performed in line with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. An extensive literature search was conducted using databases such as PubMed, ProQuest, CINAHL, The Cochrane Library, PsycINFO, and Google Scholar from inception to June 2019. The studies included were randomized controlled trials, which reported asthma outcomes in adult patients.
RESULTS: The literature search yielded 8331 publications, of which 63 studies were selected for full-text review, and of these studies, 9 studies with a total of 2011 patients were included in the final analysis. The included randomized controlled trials reported quality of life, asthma symptoms, exacerbations, health care utilization, and pulmonary function. Improvements in asthma outcomes were observed predominantly in quality of life. The effects on asthma symptom control were inconsistent. The evidence on the impact of home visits in asthma exacerbations and health care utilization was rather limited. There were no significant differences observed between intervention versus control arms in terms of pulmonary function; however, 1 study reported significant improvements in peak expiratory flow rate.
CONCLUSIONS: Home visits may serve as an adjuvant activity that complements the existing health care system-based initiatives. It may be concluded that home visits have the potential to improve outcomes in adult patients with asthma; however, the randomized controlled trials reviewed in the present systematic review reported several limitations that warrant further investigation.