Vitamin C and common cold-induced asthma: a systematic review and statistical analysis

Allergy, Asthma & Clinical Immunology

Harri Hemilä¹ 

[1] Department of Public Health, POB 41, University of Helsinki, Mannerheimintie 172, FIN-00014 Helsinki, Finland

关键词: Upper respiratory tract infections;    Rhinovirus;    Histamine;    Forced expiratory flow rates;    Common cold;    Bronchoconstriction;    Bronchial provocation tests;    Asthma;    Ascorbic acid;    Anti-asthmatic agents;   

Others  :  792065
DOI  :  10.1186/1710-1492-9-46

 received in 2013-06-26, accepted in 2013-11-07,  发布年份 2013

【 摘 要 】

Background

Asthma exacerbations are often induced by the common cold, which, in turn, can be alleviated by vitamin C.

Objective

To investigate whether vitamin C administration influences common cold-induced asthma.

Methods

Systematic review and statistical analysis of the identified trials. Medline, Scopus and Cochrane Central were searched for studies that give information on the effects of vitamin C on common cold-induced asthma. All clinically relevant outcomes related to asthma were included in this review. The estimates of vitamin C effect and their confidence intervals [CI] were calculated for the included studies.

Results

Three studies that were relevant for examining the role of vitamin C on common cold-induced asthma were identified. The three studies had a total of 79 participants. Two studies were randomized double-blind placebo-controlled trials. A study in Nigeria on asthmatics whose asthma attacks were precipitated by respiratory infections found that 1 g/day vitamin C decreased the occurrence of asthma attacks by 78% (95% CI: 19% to 94%). A cross-over study in former East-Germany on patients who had infection-related asthma found that 5 g/day vitamin C decreased the proportion of participants who had bronchial hypersensitivity to histamine by 52 percentage points (95% CI: 25 to 71). The third study did not use a placebo. Administration of a single dose of 1 gram of vitamin C to Italian non-asthmatic common cold patients increased the provocative concentration of histamine (PC₂₀) 3.2-fold (95% CI: 2.0 to 5.1), but the vitamin C effect was significantly less when the same participants did not suffer from the common cold.

Conclusions

The three reviewed studies differed substantially in their methods, settings and outcomes. Each of them found benefits from the administration of vitamin C; either against asthma attacks or against bronchial hypersensitivity, the latter of which is a characteristic of asthma. Given the evidence suggesting that vitamin C alleviates common cold symptoms and the findings of this systematic review, it may be reasonable for asthmatic patients to test vitamin C on an individual basis, if they have exacerbations of asthma caused by respiratory infections. More research on the role of vitamin C on common cold-induced asthma is needed.

【 授权许可】

   
2013 Hemilä; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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