will pancuronium cause the death of the patient if he/she is not intubated?

Answer 1

Well, not if you bag the patient continuously, yourself. They would live as long as you bagged patient until the effect of the pancuronium wore off (i.e. if intubation was unsuccessful, etc.).

But if you do absolutely nothing and enough pancuronium is given...yes, the patient would die.

Pancuronium is a neuromuscular blocker...and would effectively block muscles necessary for respiration. The patient would stop breathing...and die within minutes, as the oxygen levels in the blood slowly dropped until hypoxic...and then so low as to not oxygenate the brain...and then death.

It would be quite terrifying for the patient, if they were conscious!
They would try to gasp for breath, but be unsuccessful...and then quickly get confused and then pass out...before dying.

So, hopefully the doctor administering the drug knows what they are doing...and can intubate the patient, or continue bagging if unable to intubate the patient...