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Suxamethonium chloride (INN), also known as suxamethonium or succinylcholine, is a nicotinic acetylcholine receptor agonist, used to induce muscle relaxation and short-term paralysis, usually to facilitate tracheal intubation. Suxamethonium is sold under the trade names Anectine and Quelicin. It is sometimes used in combination with analgesics and sedatives for euthanasia and immobilization of horses. It is colloquially referred to as "sux" in hospital settings. Suxamethonium acts as a depolarizing neuromuscular blocker. It acts on nicotinic receptors resulting in persistent depolarization of the motor end plate. It is degraded by butyrylcholinesterase into succinic acid and choline. This hydrolysis by butyrylcholinesterase is much slower than that of acetylcholine by acetylcholinesterase. It is on the World Health Organization's List of Essential Medicines, a list of the most important medication needed in a basic health system. ==Medical uses== Its medical uses are limited to short-term muscle relaxation in anesthesia and intensive care, usually for facilitation of endotracheal intubation. It is perennially popular in emergency medicine because it has the fastest onset and shortest duration of action of all muscle relaxants. The former is a major point of consideration in the context of trauma care, where endotracheal intubation may need to be completed very quickly. The latter means that, should attempts at endotracheal intubation fail and the patient cannot be ventilated, there is a prospect for neuromuscular recovery and the onset of spontaneous breathing before low blood oxygen levels occurs. It is better than rocuronium in making it easy to intubate. Suxamethonium is also commonly used as the sole muscle relaxant during electroconvulsive therapy, favoured for its short duration of action. Suxamethonium is quickly degraded by plasma butyrylcholinesterase and the duration of effect is usually in the range of a few minutes. When plasma levels of butyrylcholinesterase are greatly diminished or an atypical form is present (an otherwise harmless inherited disorder), paralysis may last much longer, as is this the case in liver failure or in neonates. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Suxamethonium chloride」の詳細全文を読む スポンサード リンク
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