Magnesium sulfate for the treatment of bronchospasm complicating acute bronchitis in a four-months'-pregnant woman.

A four-months'-pregnant woman without a prior history of asthma presented to the emergency department with acute bronchitis compounded by bronchospasm. The patient failed to respond adequately to aggressive treatment with conventional therapy. Prior to hospital admission, a bolus of 3 g IV magnesium sulfate was infused with complete abatement of her bronchospasm, significantly increasing peak expiratory flow rate without any significant side effects. The patient was discharged home and remained asymptomatic thereafter.