Pathophysiology and management of severe asthma.

Severe asthma is characterized by marked airway obstruction caused by mucus plugging, airway edema and inflammation, and contractions of airway smooth muscle. This leads to a complex series of pathophysiologic events that can be reversed with vigorous treatment given for a sufficient period of time. Standard treatment includes not only bronchodilating agents and corticosteroids but in some instances mechanical ventilation.