I think your description of the pathophysiology of asthma was right on point. Due to the release of the mediators causing an increase in blood flow and vasoconstriction, which is why his BP increased and experiencing tachycardia. With bronchoconstriction, causing him to used excessive muscle to breathing, leading him to have tachypnea of 42 with shallow breathing.
Since the patient is experiencing exacerbating, it is important to act quickly and manage it by early treatment and education. There should be a written action plan as part of any overall effort to educate patients about self-management techniques, especially when it comes with moderate to severe persistent asthma or with a history of severe exacerbation. When it comes to