Final answer:
Rocuronium has the fastest onset of action among non-depolarizing neuromuscular blockers.
Step-by-step explanation:
Among non-depolarizing neuromuscular blockers, rocuronium has the fastest onset of action. It is a rapidly acting neuromuscular blocker with a quick onset of action, typically taking effect within 1-2 minutes. This makes it a commonly used agent for rapid sequence induction and intubation in anesthesia.
On the other hand, vecuronium is another commonly used non-depolarizing neuromuscular blocker, but it has a slower onset of action compared to rocuronium. It typically takes effect within 3-5 minutes.
It is important to note that the onset of action of a neuromuscular blocker can vary depending on factors such as the dose administered, route of administration, and patient characteristics.