Question:easy
Shortest acting non depolarizing muscle relaxant is?
Shortest acting non depolarizing muscle relaxant is?
Show Hint
Which competitive blocker is metabolised by plasma pseudocholinesterase?
Updated On: Jun 24, 2026
- Mivacurium
- Doxacurium
- Pipecuronium
- Vecuronium
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: We are restricted to the non depolarizing class and asked for the briefest acting member. Duration depends largely on how fast the body clears the drug.
Step 2: Mivacurium stands out because it is broken down by plasma pseudocholinesterase, the same enzyme that destroys succinylcholine. This metabolic clearance gives it the shortest action among competitive blockers.
Step 3: Comparing the rest: doxacurium and pipecuronium are long acting, and vecuronium is intermediate acting, so none are shorter than mivacurium. Succinylcholine is shorter still but is depolarizing and therefore excluded here.
\[\boxed{\text{Mivacurium}}\]
Step 2: Mivacurium stands out because it is broken down by plasma pseudocholinesterase, the same enzyme that destroys succinylcholine. This metabolic clearance gives it the shortest action among competitive blockers.
Step 3: Comparing the rest: doxacurium and pipecuronium are long acting, and vecuronium is intermediate acting, so none are shorter than mivacurium. Succinylcholine is shorter still but is depolarizing and therefore excluded here.
\[\boxed{\text{Mivacurium}}\]
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