18 year old who is known to have bronchial asthma is admitted with severe
dyspnoea and wheezing.
examination he is distressed , cannot complete sentences when speaking , pulse
120 beats per minute , BP 119/70 , respiratory rate 32 per minute , heart
sounds normal , bilateral rhonchi throughout both lung fields .
patient is treated with inhaled salbutamol and ipratropium and steroids.
Despite this he continues to be dyspnoeic and is becoming restless and
next step would be:
Broad spectrum antibiotics