Pharmacology  ·  Neuromuscular Blocking Drugs

Nondepolarizing Agents — Comparison

Duration, elimination, cardiovascular effects, and sugammadex eligibility

• All nondepolarizing neuromuscular blocking drugs are competitive nicotinic antagonists — they differ not in mechanism but in duration, elimination pathway, onset speed, and cardiovascular profile.
• The steroidal agents (rocuronium, vecuronium, pancuronium) are selectively encapsulated by sugammadex; the benzylisoquinolinium agents (atracurium, cisatracurium, mivacurium) are not sugammadex targets.
• Atracurium and cisatracurium undergo Hofmann elimination — spontaneous chemical degradation independent of hepatic or renal function — making them the agents of choice in combined organ failure.
• Traditional reversal with neostigmine raises acetylcholine to compete the blocking drug off the receptor, requires antimuscarinic pretreatment, and cannot reverse deep block; sugammadex encapsulates drug directly and reverses even a zero-TOF block without antimuscarinic pretreatment.
• Pancuronium's vagolytic cardiac effect (tachycardia) distinguishes it from vecuronium and rocuronium, which have essentially no cardiovascular impact at clinical doses.