You are treating a patient who was working outside in their…

You are treating a patient who was working outside in their garden and is now complaining of a sudden onset of shortness of breath. They deny chest pain and are alert and oriented. Vital signs​ are: BP 100/60​; HR 160; RR 34; and SpO2 89%. The​ patient’s vital signs and history are most consistent with​ a(n):