Which neuromuscular blocker is primarily used for its rapid onset of action?

Succinylcholine is primarily known for its rapid onset of action among neuromuscular blockers, making it particularly valuable in situations such as rapid sequence intubation. It acts as a depolarizing neuromuscular blocker, which means it mimics acetylcholine at the neuromuscular junction, leading to an initial muscle contraction followed by paralysis. The unique chemical structure of succinylcholine allows it to be rapidly broken down by plasma cholinesterase, resulting in a swift effect that can take place within one minute of administration.

This rapid action is crucial in emergency settings where time is of the essence, as it allows for immediate relaxation of skeletal muscles. The fast onset contrasts with non-depolarizing neuromuscular blockers, which generally have slower onset times and require longer for paralysis to occur. Thus, succinylcholine's rapid onset makes it the preferred choice in acute and emergent situations where quick airway control is necessary.