The effects of various doses of inhaled MgSO4 on the histamine bronchoprovocation test were studied in nine asthmatics in clinical remission (FEV1 greater than 80% of predicted). The minimal effective dose of MgSO4 was 0.20 mmol, which increased the dose of histamine which produced a 20% decrease in control FEV1 (PD20) from 2.88 +/- 1.4 to 5.62 +/- 1.38 mumol, p less than 0.05. A greater increase of histamine PD20 was observed after inhalation of MgSO4 at 0.40 mmol (6.90 +/- 1.6 mumol of histamine, p less than 0.05 in comparison with baseline PD20). The decrease in bronchial hyper-reactivity produced by MgSO4 suggests that it influences smooth muscle contractility and may prove to be clinically important in the treatment of asthma.
Dose-related effect of inhaled magnesium sulfate on histamine bronchial challenge in asthmatics.
ROLLA, Giovanni;BUCCA, Caterina;
1988-01-01
Abstract
The effects of various doses of inhaled MgSO4 on the histamine bronchoprovocation test were studied in nine asthmatics in clinical remission (FEV1 greater than 80% of predicted). The minimal effective dose of MgSO4 was 0.20 mmol, which increased the dose of histamine which produced a 20% decrease in control FEV1 (PD20) from 2.88 +/- 1.4 to 5.62 +/- 1.38 mumol, p less than 0.05. A greater increase of histamine PD20 was observed after inhalation of MgSO4 at 0.40 mmol (6.90 +/- 1.6 mumol of histamine, p less than 0.05 in comparison with baseline PD20). The decrease in bronchial hyper-reactivity produced by MgSO4 suggests that it influences smooth muscle contractility and may prove to be clinically important in the treatment of asthma.
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