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Abstract Title:

Selenium supplementation for asthma.

Abstract Source:

Cochrane Database Syst Rev. 2004;(2):CD003538. PMID: 15106206

Abstract Author(s):

M F Allam, R A Lucane

Abstract:

BACKGROUND: Selenium deficiency may be important in chronic asthma. Observational studies have demonstrated that patients with chronic asthma may have lower levels of selenium than their control. Nevertheless, selenium supplementation has not been recommended with drug therapy for asthma. This review systematically examines RCTs that evaluated the role of selenium supplementation in chronic asthma. OBJECTIVES: Recognition that chronic asthma can be associated with selenium deficiency has led to the investigation of the role of selenium supplementation in reducing the symptoms and impact of chronic asthma. The objective of this review was to assess the efficacy of selenium supplementation as an adjunct to medication for the treatment of chronic asthma. SEARCH STRATEGY: We searched the Cochrane Airways Group trials register, MEDLINE/PUB MED, and EMBASE. Searches were current as of August 2003. SELECTION CRITERIA: Randomised trials comparing patients with chronic asthma receiving selenium supplementation in conjunction with asthma medication, with patients taking asthma medication only. DATA COLLECTION AND ANALYSIS: Two reviewers applied the study inclusion criteria MAIN RESULTS: One trial with a total of 24 patients suffering from chronic asthma was included. The study reported significant clinical improvement in the selenium-supplemented group, as compared with the placebo group, in terms of a 'clinical evaluation'. However, this improvement could not be validated by significant changes in separate objective parameters of lung function and airway hyper-responsiveness. REVIEWERS' CONCLUSIONS: There is some indication that selenium supplementation may be a useful adjunct to medication for patients with chronic asthma. This conclusion is limited because of insufficient studies and lack of improvement in the clinical parameters of lung function.

Study Type : Human Study

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Sayer Ji
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