Intravenous or nebulised MgSO ( @ ) did not significantly decrease rates of hospital admission and breathlessness compared with placebo : intravenous MgSO ( @ ) was associated with an odds ratio of @ ( @ % CI @ to @ ; p = @ ) for hospital admission and a change in VAS breathlessness of @ mm ( -@ to @ ; p = @ ) compared with placebo ; nebulised MgSO ( @ ) was associated with an odds ratio of @ ( @ to @ ; p = @ ) for hospital admission and a change in VAS breathlessness of -@ mm ( -@ to @ ; p = @ ) compared with placebo .