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Skeletal Muscle Relaxants
N/A
15
Medical
Graduate
02/06/2009

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Term
Structurally related to acetylcholine, used to produce muscle paralysis in order to facilitate surgery or artificial ventilation. Full doses lead to respiratory paralysis and require ventilation
Definition
Neuromuscular blocking drugs
Term
These drugs strongly potentiate and prolong effect of neuromuscular blockade (NMB)
Definition
Inhaled anesthetics, especially isoflurane, aminoglycosides, and antiarrhythmic
Term
These prevent the action of ACh at the skeletal muscle endplate to produce a "surmountable blockade," effect is reversed by cholinesterase inhibitors (ex. neostigmine or pyridostigmine)
Definition
Nondepolarizing type antagonists
Term
Agent with long DOA and is most likely to cause histamine release
Definition
Tubocurarine
Term
Non-depolarizing antagonist has short duration
Definition
Mivacurium
Term
Agent can block muscarinic receptors
Definition
Pancuronium
Term
Agent undergoing Hofmann elimination (breaking down spontaneously)
Definition
Atracurium
Term
One depolarizing blocker that causes continuous depolarization and results in muscle relaxation and paralysis, causes muscle pain postoperatively and myoglobinuria may occur
Definition
Succinylcholine
Term
During Phase 1 these agents worsen the paralysis by succinylcholine, but during phase II they reverse the blockade produced by succinylcholine
Definition
Cholinesterase inhibitors
Term
MOA of non-depolarizing drugs
Definition
Act at Nicotinic receptors by competing with ACh
Term
Initial effect of Depolarizing Drug
Definition
Fasciculations
Term
Characteristics of NM blocking drugs
Definition
highly polar, poorly lipid soluble
Term
Causes hypotension due to histamine release
Definition
Tubocurarine and Mivacurium
Term
Causes cardiac arrhythmias when with halothane anesthetics; Stimulates Autonomic cholinoreceptors (Negative inotropic and chronotropic)
Definition
Succinylcholine
Term
Adverse effects of depolarizing agents
Definition
Hyperkalemia, Increased intraocular pressure, increased gastric pressure and muscle pain
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