A 21-year-old man with a history of asthma develops audible wheezing and a flow-volume curve suggestive of diffuse airway obstruction several minutes after tracheal intubation. Which of the following is appropriate intra-operative management?
A. Increased inspiratory concentration of inhaled agent
B. Skeletal muscle relaxation
C. Increased inspired oxygen concentration
D. Inhaled sympathomimetic agents
E. All of the above