Well, was the patient febrile? was he in acute distress, what was he doing when it started, how was his bloodpressure? Was there any jvd, peripheral edema, was he diaphoretic, mild, moderate, severe distress. It sounds like pneumonia too me, from what little info you did give, if it was pneumonia in my state he would be going bls to the hospital, 99% spo2 is better than mine. And too many questions about what his actuall level of distress was? are you a paramedic?