21 - AIIMS june 1998 anaesthesia mcqs

1q: muscle relaxant excreted exclusively by kidney is ?

a. scoline
b. atracurium
c. vecuronium
d. gallamine

answer d. gallamine

2q: shortest acting non depolarizing muscle relaxant is ?

a. vecuronium
b. atracurium
c. succinyl choline
d. mivacurium

answer d. mivacurium

3q: lowest concentration of anaesthetic agent in pulmonary alveoli needed to produce immobility in response to painful stimulus in 50 % individual is termed as ?

a. minimal alveolar concentration
b. maximum alveolar concentration
c. maximum analgesic concentration
d. maximum analgesic concentration

answer a. minimal alveolar concentration ( MAC )

7 - muscle relaxants - onset and duration of action list

Muscle relaxants	Onset ( minutes )	Duration ( minutes )
Succinyl choline	1-1.5	3-6
Mivacurium	2-4	12-20
Rocuronium	1-2	25-40
Vecuronium	2-4	30-60
Atracurium	2-4	20-35
Cisatracurium	3-6	20-40
Piperacuronium	2-4	50-100
d-tubocurarine	4-6	30-60
Pancuronium	4-6	40-80
Doxacurium	4-8	60-120

So if the question is ?

Q: what is the shortest acting muscle relaxant ?

Answer : succinyl choline .

Q: what is the shortest acting non-depolarising muscle relaxant ?

Answer: mivacurium

Q: what is the longest acting muscle relaxant ?

Answer: doxacurium .

Q: what is the longest acting non-depolarising muscle relaxant ?

Answer: doxacurium .

TRY USING THIS MNEMONIC TO REMEMBER : Suck Me Rosy Victoria's Attractive Sister , Prepare To Please Doctors.

( in PREPARE = Two P s indicate piperacuronium and please indicates pancuronium )