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any compound containing a chlorine atom
any salt of hydrochloric acid (containing the chloride ion)

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塩化物

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/12 01:15:10」(JST)

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Mivacurium chloride (formerly recognized as BW1090U81, BW B1090U or BW1090U) is a short-duration non-depolarizing neuromuscular-blocking drug^[1] or skeletal muscle relaxant in the category of non-depolarizing neuromuscular-blocking drugs,^[2] used adjunctively in anesthesia to facilitate endotracheal intubation^[3] and to provide skeletal muscle relaxation during surgery or mechanical ventilation.

Structure

Mivacurium is a symmetrical molecule although it is a mixture of three of the twenty possible isomers: the isomerism stems from chirality at the C-1 carbon position of both the tetrahydroisoquinolinium rings, as well as both the positively charged nitrogen (onium) heads, and the E/Z diastereomerism at the C=C double bond of the oct-4-ene diester bridge. Thus, owing to the symmetry and chirality, the three isomers of mivacurium are (E)-1R,1'R,2R,2'R, (identified as BW1217U84), (E)-1R,1'R,2R,2'S, (BW1333U83) and (E)-1R,1'R,1'S,2'S, (BW1309U83). These are also known as cis-cis, cis-trans and trans-trans Mivacurium. The proportions are; (E)-cis-cis 6% of the mixture, (E)-cis-trans 36% of the mixture and (E)-trans-trans 56% of the mixture. Unlike the potency of the cis-cis isomer of Atracurium (also known as 51W89 and eventually marketed as the drug cisatracurium), the cis-cis isomer of mivacurium has by far the lowest potency as a muscle relaxant when compared with its other two stereoisomers. It has approximately 10% of the activity of each of the other two structures.

Mivacurium belongs to a class of compounds that is commonly and most erroneously referred to as "benzylisoquinolines" when, in fact, it is a bisbenzyltetrahydroisoquinolinium agent, often abbreviated to bbTHIQ.

The orientation of the two O atoms in the bridge is to the THIQ side of the carbonyl C=O group, whereas in Atracurium the O atom is on the bridge side. Atracurium's groups are "reversed ester" linkages. This makes ester hydrolysis degradation by plasma cholinesterase more favourable.

Pharmacology

Having ten methoxy -OCH₃ groups, mivacurium is a more potent neuromuscular blocking drug than Atracurium, which has eight, but is less potent than Doxacurium, which has twelve.

Like other non-depolarizing neuromuscular blockers, the pharmacological action of mivacurium is antagonism to nicotinic acetylcholine receptors. However, unlike other non-depolarizing neuromuscular blockers, it is metabolized by plasma cholinesterase. Metabolism can therefore be very slow in people with pseudocholinesterase deficiency, resulting in prolonged paralysis. The same problem exists with the depolarizing NMB succinylcholine.

Availability

Mivacurium is available worldwide although, in recent years, its use in the United States has declined rapidly in favor of alternative agents perceived to offer a more rapid onset of action and a safer cardiovascular profile when administered in a rapid bolus dose. It is far more commonly used in Europe and the United Kingdom. The drug is marketed worldwide under the tradename of Mivacron.

History

Mivacurium represents the second generation of tetrahydroisoquinolinium neuromuscular blocking drugs in a long lineage of nicotinic acetylcholine receptor anatagonists synthesized by Mary M. Jackson and James C. Wisowaty, PhD (both chemists within the Chemical Development Laboratories at Burroughs Wellcome Co., Research Triangle Park, NC) in collaboration with John J. Savarese MD (who at the time was an anesthesiologist in the Dept. of Anesthesia, Harvard Medical School at the Massachusetts General Hospital, Boston, MA). Specifically, mivacurium was first synthesized in 1981. Early structure-activity studies had confirmed that the bulky nature of the "benzylisoquinolinium" entity provided a non-depolarizing mechanism of action. Partial saturation of the benzylisoquinoline ring to the tetrahydroisoquinoline ring provided an even further increase in potency of the molecules without detrimental effects to other pharmacological properties: this key finding led to the rapid adoption of the tetrahydroisoquinolinium structures as a standard building block (along with a 1-benzyl attachment), and it is the primary reason why the continued unwarranted reference to "benzylisoquinolinium" is a complete misnomer for all clinically introduced and currently used neuromuscular blocking agents in this class because they are all, in fact, tetrahydroisoquinoline derivatives. By definition, therefore, there has never been, in the history of clinical anesthetic practice, the use of a benzylisoquinoline neuromuscular blocking agent.

The heritage of mivacurium and indeed its very closely related cousin, doxacurium chloride, harks back to the synthesis of numerous compounds following structure-activity relationships that drove researchers to find the ideal replacement for succinylcholine (suxamethonium). Both mivacurium and doxacurium are descendants of early vigorous attempts to synthesize potent non-depolarizing agents with pharmacophores derived from cross-combinations of the non-depolarizing agent, laudexium, and the well-known depolarizing agent, succinylcholine (suxamethonium chloride). Ironically, laudexium itself was invented by a cross-combination between the prototypical non-depolarizing agent, d-tubocurarine and the depolarizing agent, decamethonium. From the 1950s through to the 1970s, the present-day concept of a neuromuscular blocking agent with a rapid onset and an ultra-short duration of action had not taken root: researchers and clinicians were still on the quest for potent but non-depolarizing replacements devoid of the histamine release and the dreaded "recurarizing" effects seen with tubocurarine and, more importantly, the absence of a depolarizing mechanism of action as seen with succinylcholine and decamethonium.

Clinical pharmacology and pharmacokinetics

The first clinical trial of mivacurium (BW1090U), in 1984, was conducted in a cohort of 63 US patients undergoing surgical anesthesia.^[4] at the Harvard Medical School at Massachusetts General Hospital, Boston, MA. Preliminary data from the study confirmed a promise for this agent to elicit considerably lesser severity of histamine release than that observed with its immediate predecessor clinically tested agents, BW785U77^[5]^[6] and BWA444U,^[7] which were discontinued from further clinical development. Mivacurium did not exhibit the ultra-short duration of action seen with BW785U; whereas, BW A444U produced an intermediate duration of action.

Mivacurium is a biodegradable neuromuscular blocking agent owing to its degradation by plasma cholinesterases - the esterases rapidly hydrolyze one ester moiety initially resulting in a two mono-quaternary metabolites of which one still has an intact ester moiety. The second ester is metabolized much more slowly, although the lack of a bis-quaternary structure effectively terminates the neuromusuclar blocking action.

References

^ Ihmsen H, Schmidt J, Schwilden H, Schmitt HJ, Muenster T (May 2009). "Influence of disease progression on the neuromuscular blocking effect of mivacurium in children and adolescents with Duchenne muscular dystrophy". Anesthesiology 110 (5): 1016–9. doi:10.1097/ALN.0b013e31819daf31. PMID 19352159.
^ Stout RG, Shine TS, Silverman DG, Brull SJ (September 2004). "Recovery of neuromuscular function after a combination of mivacurium and rocuronium". Yale J Biol Med 77 (5–6): 149–54. PMC 2259125. PMID 15989744.
^ Dempsey EM, Al Hazzani F, Faucher D, Barrington KJ (July 2006). "Facilitation of neonatal endotracheal intubation with mivacurium and fentanyl in the neonatal intensive care unit". Arch. Dis. Child. Fetal Neonatal Ed. 91 (4): F279–82. doi:10.1136/adc.2005.087213. PMC 2672731. PMID 16464937.
^ Basta SJ, Savarese JJ, Ali HH, Scott RPF, Gargarian M, Embree PB, Murphy B, Weakly JN, Batson AG (1985). "The neuromuscular pharmacology of BW B1090u in anesthetized patients". Anesthesiol 63 (3): A318. doi:10.1097/00000542-198509001-00318.
^ Savarese JJ, Ali HH, Basta SJ, Ramsey FM, Rosow CE, Lebowitz PW, Lineberry CG, Cloutier G (1980). "Clinical neuromuscular pharmacology of Bw785u, an ultra-short-acting nondepolarizing ester neuromuscular blocking agent". Anesthesiol 53 (3): S274. doi:10.1097/00000542-198009001-00274.
^ Ali HH, Savarese JJ, Basta SJ, Ramsey F, Rosow CE, Lebowitz PW (1980). "Prediction of clinical neuromuscular Ed95 of Bw785u from low dose studies in awake volunteers". Anesthesiol 53 (3): S275. doi:10.1097/00000542-198009001-00275.
^ Savarese JJ, Ali HH, Basta SJ, Sunder N, Moss J, Gionfriddo MA, Lineberry CG, Wastila WB, El-Sayad HA, Montague D, Braswell L (1983). "The clinical pharmacology of BW A444U. A nondepolarizing ester relaxant of intermediate duration". Anesthesiol 58 (4): 333–341. doi:10.1097/00000542-198304000-00006. PMID 6220623.

UpToDate Contents

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1. 重症患者における神経筋遮断剤の使用 use of neuromuscular blocking medications in critically ill patients
2. 成人における迅速導入気管挿管のための神経筋遮断剤（NMBA） neuromuscular blocking agents nmba for rapid sequence intubation in adults
3. 高齢患者に対する麻酔 anesthesia for the older adult patient
4. 麻酔後ケア病棟における合併症発生の概要 overview of complications occurring in the post anesthesia care unit
5. 周術期アナフィラキシー：再発反応の評価および予防 perioperative anaphylaxis evaluation and prevention of recurrent reactions

English Journal

[The Effect of Non-Depolarising Muscle Relaxants on Ocular Pulse Amplitude and Intraocular Pressure].

Zuche H1, Morinello E2, Viestenz A1, Fiorentzis MF1, Volk T2, Seitz B1, Viestenz A1.
Klinische Monatsblatter fur Augenheilkunde.Klin Monbl Augenheilkd.2015 May 21. [Epub ahead of print]
Aim: In general anaesthesia (GA) for ocular surgery the chosen non-depolarising muscle relaxant has a high influence on the fluctuations of intraocular pressure (IOP) and ocular pulse amplitude (OPA). Patients and Methods: In 229 patients, who needed GA for their ophthalmic surgery, OPA and IOP were
PMID 25997093

A systematic review and meta-regression analysis of mivacurium for tracheal intubation.

Vanlinthout LE1, Mesfin SH, Hens N, Vanacker BF, Robertson EN, Booij LH.
Anaesthesia.Anaesthesia.2014 Dec;69(12):1377-87. doi: 10.1111/anae.12786. Epub 2014 Jul 10.
We systematically reviewed factors associated with intubation conditions in randomised controlled trials of mivacurium, using random-effects meta-regression analysis. We included 29 studies of 1050 healthy participants. Four factors explained 72.9% of the variation in the probability of excellent in
PMID 25040541

Characterization of a novel butyrylcholinesterase point mutation (p.Ala34Val), "silent" with mivacurium.

Delacour H1, Lushchekina S2, Mabboux I1, Ceppa F3, Masson P4, Schopfer LM5, Lockridge O6.
Biochemical pharmacology.Biochem Pharmacol.2014 Dec 1;92(3):476-83. doi: 10.1016/j.bcp.2014.09.014. Epub 2014 Sep 28.
Butyrylcholinesterase deficiency is characterized by prolonged apnea after the use of muscle relaxants (suxamethonium or mivarcurium) in patients who have mutations in the BCHE gene. Here, we report a case of prolonged neuromuscular block after administration of mivacurium leading to the discovery o
PMID 25264279

Japanese Journal

In vitro metabolism of mivacurium chloride (BW B1090U) and succinylcholine

COOK DR
Anesth Analg 68, 452-456, 1989
NAID 30012763791

The cardiovascular effects of mivacurium chloride (BW B1090U) in patients receiving nitrous oxide-opiate-barbiturate anesthesia

SAVARESE JJ
Anesthesiology 70, 386-394, 1989
NAID 30009149700

The clinical pharmacology of mivacurium chloride (BW B1090U) : a short-acting nondepolarizing ester neuromuscular blocking drug

SAVARASE JJ
Anesthesiology 68, 723-732, 1988
NAID 30009148394

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★リンクテーブル★

リンク元	「ミバクリウム」「塩化ミバクリウム」
関連記事	「mivacurium」「chloride」

「ミバクリウム」

Mivacurium chloride
Systematic (IUPAC) name
	(1R,1'R)-2,2'-[[(4E)-1,8-dioxooct-4-ene-1,8-diyl]bis(oxypropane-3,1-diyl)]bis[6,7-dimethoxy-2-methyl-1-(3,4,5-trimethoxybenzyl)-1,2,3,4-tetrahydroisoquinolinium]
Clinical data
AHFS/Drugs.com	International Drug Names
Legal status	Worldwide: prescription only medicine;
Routes of; administration	IV
Pharmacokinetic data
Bioavailability	100% (IV)
Metabolism	ester hydrolysis by plasma cholinesterases
Identifiers
CAS Registry Number	106791-40-6
ATC code	M03AC10
PubChem	CID: 71316
DrugBank	DB01226
UNII	600ZG213C3
ChEMBL	CHEMBL984
Synonyms	bis[3-[6,7-dimethoxy-2-methyl-1-[(3,4,5-trimethoxyphenyl)methyl]-3,4-dihydro-1H-isoquinolin-2-yl]propyl] oct-4-enedioate
Chemical data
Formula	C58H80N2O14+2
Molecular mass	1029.26 g/mol