This is an indication the patient could be having bronchitis as the doctor said and thus the medicines he was on were not helpful. In this case, the doctor wants to observe him closely while giving him the new medicines through injections.
Bronchitis can be very serious! Take your doctors advice. My sister went to Heaven from having bronchitis! The doctors let it go too long and did not take her serious! Sounds like you have a good doctor. we will be praying for you :)