Project Specific Aim: This is a pilot study to determine the safety of three different doses of pulmozyme® (2.5mg, 5.0mg and 7.5mg) in patients presenting to the ED with acute asthma. In addition to safety trends for improvement in pulmonary function and clinical outcomes will be monitored and data analyzed. Based on the safety profile and observable responses to treatment, this information may be used to develop larger trials to determine the efficacy and dosing strategy for treating acutely ill asthmatics with rhDNAse.