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| Systematic (IUPAC) name | |
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2,2'-{1,5-Pentanediylbis[oxy(3-oxo-3,1-propanediyl)]}bis[1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolinium] dibenzenesulphonate
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| Clinical data | |
| AHFS/Drugs.com | International Drug Names |
| Legal status |
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| Routes of administration |
IV |
| Pharmacokinetic data | |
| Bioavailability | 100% (IV) |
| Protein binding | 82% |
| Metabolism | Hofmann elimination (retro-Michael addition) and ester hydrolysis by nonspecific esterases |
| Biological half-life | 17–21 minutes |
| Identifiers | |
| CAS Registry Number | 64228-79-1 |
| ATC code | M03AC04 |
| PubChem | CID: 47319 |
| DrugBank | DB00732 Y |
| ChemSpider | 43067 Y |
| UNII | 40AX66P76P N |
| ChEBI | CHEBI:2914 Y |
| ChEMBL | CHEMBL1360 Y |
| Chemical data | |
| Formula | C53H72N2O122+ |
| Molecular mass | 929.145 g/mol |
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| N (what is this?) (verify) | |
Atracurium besylate[1] is a neuromuscular-blocking drug or skeletal muscle relaxant in the category of non-depolarizing neuromuscular-blocking drugs, used adjunctively in anesthesia to facilitate endotracheal intubation and to provide skeletal muscle relaxation during surgery or mechanical ventilation. Atracurium is classified as an intermediate-duration non-depolarizing neuromuscular-blocking agent.
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.[2]
Contents
- 1 Intramuscular function parameters
- 2 Duration of action
- 3 Preclinical pharmacology
- 4 Clinical pharmacology
- 5 Adverse effects
- 5.1 Histamine release - hypotension, reflex tachycardia and cutaneous flush
- 5.2 Bronchospasm - pulmonary compliance
- 5.3 Laudanosine – Epileptic foci
- 6 History
- 7 References
- 8 External links
Intramuscular function parameters
- ED95: the dose of any given intramuscular-blocking agent required to produce 95% suppression of muscle twitch (e.g., the abductor pollicis) response with balanced anesthesia
- Clinical duration: difference in time between time of injection and time to 25% recovery from neuromuscular block
- Train-of-Four (TOF) response: stimulated muscle twitch response in trains of four when stimuli are applied in a burst of four as opposed to a single stimulus, equal depression in depolarizing and fading response with non-depolarizing blocker.
- 25%-75% recovery index: an indicator of the rate of skeletal muscle recovery - essentially, the difference in time between the time to recovery to 25% and time to recovery to 75% of baseline value
- T4:T1 ≥ 0.7: a 70% ratio of the fourth twitch to the first twitch in a TOF - provides a measure of the recovery of neuromuscular function
- T4:T1 ≥ 0.9: a 90% ratio of the fourth twitch to the first twitch in a TOF - provides a measure of the full recovery of neuromuscular function
Duration of action
Neuromuscular-blocking agents can be classified in accordance to their duration of pharmacological action, defined as follows:
| Parameter | Ultra-short Duration | Short Duration | Intermediate Duration | Long Duration |
|---|---|---|---|---|
| Clinical Duration (Time from injection to T25% recovery) |
6-8 | 12-20 |
30-45 |
>60 |
| Recovery Time (Time from injection to T95% recovery) |
<15 | 25-30 |
50-70 |
90-180 |
| Recovery Index (T25%-T75% recovery slope) | 2-3 | 6 |
10-15 |
>30 |
Preclinical pharmacology
Several publications describe the preclinical pharmacology of atracurium. Hughes and Payne described the preliminary pharmacology of atracurium in anesthethetized cats, dogs and rhesus monkeys.[3] A 14C radiolabeled metabolism study in cats confirmed the lack of hepatic or renal involvement in the metabolism of atracurium: radioactivity eliminated in bile and urine was predominantly from metabolites rather than the unchanged parent drug.[4]
Chapple and Clarke[5] reported on the neuromuscular and cardiovascular effects of the breakdown products of atracurium and related substances in anesthetized cats. They concluded that the metabolites were of low potencies, and quite likely that the quantities present either as an impurity or formed after administration of therapeutic doses of atracurium (0.3–0.6 mg kg-1 i.v.) would be of no pharmacological importance. Laudanosine, the quaternary acid and metholaudanosine were devoid of neuromuscular blocking activity within the dose range 0.5–4 mg kg-1. However, within this dose range, they reported that the quaternary monoacrylate, the quaternary alcohol and the monoquaternary analogue produced a dose-dependent neuromuscular block. Administration of the quaternary monoacrylate, laudanosine, the quaternary alcohol, metholaudanosine and the monoquaternary analogue at 4 mg kg-1 doses resulted in a significant reduction in mean arterial pressure (by 30–70 mm Hg). Significant sympathetic blockade after preganglionic nerve stimulation was observed only with the monoquaternary analogue at a dose of 4 mg kg-1, whereas significant vagal blockade occurred after 4 mg kg-1 of the quaternary monoacrylate, the quaternary acid, the quaternary alcohol, and the monoquaternary analogue.
Clinical pharmacology
Atracurium is susceptible to degradation by Hofmann elimination and ester hydrolysis as components of the in vivo metabolic processes.[6][7] The initial in vitro studies appeared to indicate a major role for ester hydrolysis[6] but, with accumulation of clinical data over time, the preponderence of evidence indicated that Hofmann elimination at physiological pH is the major degradation pathway[7] vindicating the premise for the design of atracurium to undergo an organ-independent metabolism.[8]
Hofmann elimination is a temperature- and pH-dependent process, and therefore atracurium's rate of degradation in vivo is highly influenced by body pH and temperature: An increase in body pH favors the elimination process,[9][3] whereas a decrease in temperature slows down the process.[8] Otherwise, the breakdown process is unaffected by the level of plasma esterase activity, obesity,[10] age,[11] or by the status of renal[12][13][14][15] or hepatic function.[16] On the other hand, excretion of the metabolite, laudanosine, and, to a small extent, atracurium itself is dependent on hepatic and renal functions that tend to be less efficient in the elderly population.[11][14] The pharmaceutical presentation is a mixture of all ten possible stereoisomers. Although there are four stereocentres, which could give 16 structures, there is a plane of symmetry running through the centre of the diester bridge, and so 6 meso structures (structures that can be superimposed by having the opposite configuration then 180° rotation) are formed. This reduces the number from sixteen to ten. There are three cis-cis isomers (an enantiomeric pair and a meso structure), four cis-trans isomers (two enantiomeric pairs), and three trans-trans isomers (an enantiomeric pair and a meso structure). The proportions of cis−cis, cis−trans, and trans−trans isomers are in the ratio of 10.5 :6.2 :1. [cis-cis isomers ≈ 58% cis-trans isomers ≈ 36% trans-trans isomers ≈ 6%]. One of the three cis-cis structures is marketed as a single-isomer preparation, cisatracurium (trade name Nimbex); it has the configuration 1R, 2R, 1′R, 2′R at the four stereocentres. The beta-blocking drug Nebivolol has ten similar structures with 4 stereocentres and a plane of symmetry, but only two are presented in the pharmaceutical preparation.
Adverse effects
Histamine release - hypotension, reflex tachycardia and cutaneous flush
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The tetrahydroisoquinolinium class of neuromuscular blocking agents, in general, is associated with histamine release upon rapid administration of a bolus intravenous injection.[17] There are some exceptions to this rule; e.g., cisatracurium (Nimbex) is one such agent that does not elicit histamine release even up to 5xED95 doses.[citation needed] The liberation of histamine is a dose-dependent phenomenon such that, with increasing doses administered at the same rate, there is a greater propensity for eliciting histamine release and its ensuing sequelae.[citation needed] Most commonly, the histamine release following administration of these agents is associated with observable cutaneous flushing (facial face and arms, commonly), hypotension and a consequent reflex tachycardia.[citation needed] It should be noted though that these sequelae are very transient effects: The total duration of the cardiovascular effects is no more than one to two minutes, while the facial flush may take around 3–4 minutes to dissipate.[citation needed] Because these effects are so transient, there is no reason to administer adjunctive therapy to ameliorate either the cutaneous or the cardiovascular effects.
Bronchospasm - pulmonary compliance
Bronchospasm has been reported on occasion with the use of atracurium.[18][19][20][21] However, this particular undesirable effect does not appear to be observed nearly as often as that seen with rapacuronium, which led to the latter's withdrawal of approval for clinical use worldwide.
The issue of bronchospasm acquired prominence in the neuromuscular-blocking agents arena after the withdrawal from clinical use of rapacuronium (Raplon - a steroidal neuromuscular-blocking agent marketed by Organon) in 2001[22][23] after several serious events of bronchospasm,[24][25] including five unexplained fatalities,[26] following its administration. Bronchospasm was not an unknown phenomenon prior to rapacuronium: occasional reports of bronchospasm have been noted also with the prototypical agents, tubocurarine[27][28][29] and succinylcholine,[30][31][32][33][34] as well as alcuronium,[35] pancuronium,[36][37] vecuronium,[38][39] and gallamine.[40]
Laudanosine – Epileptic foci
Because atracurium undergoes Hofmann elimination as a primary route of chemodegradation, one of the major metabolites from this process is laudanosine, a tertiary amino alkaloid reported to be a modest CNS stimulant with epileptogenic activity[41] and cardiovascular effects such a hypotension and bradycardia.[42] As part of the then fierce marketing battle between the competing pharmaceutical companies (Burroughs Wellcome Co. and Organon, Inc.) with their respective products, erroneous information was quickly and subtly disseminated very shortly after the clinical introduction of atracurium that the clinical use of atracurium was likely to result in a terrible tragedy because of the significant clinical hazard by way of frank seizures induced by the laudanosine by-product[41] - the posited hypothesis being that the laudanosine produced from the chemodegradation of parent atracurium would cross the blood–brain barrier in sufficiently high enough concentrations that lead to epileptogenic foci.[43] Fortunately, both for the public and for atracurium, rapid initial investigations irrefutably failed to find any overt or EEG evidence for a connection between atracurium administration and epileptogenic activity.[44][45] Indeed, because laudanosine is cleared primarily via renal excretion, a cat study modelling anephric patients went so far as to corroborate that EEG changes, when observed, were evident only at plasma concentrations 8 to 10 times greater than those observed in humans during infusions of atracurium.[46] Thus, the cat study predicted that, following atracurium administration in an anephric patient, laudanosine accumulation and related CNS or cardiovascular toxicity were unlikely - a prediction that correlated very well with a study in patients with renal failure and undergoing cadaveric renal transplantation.[47] Furthermore, almost a decade later, work by Cardone et al..[48] confirmed that, in fact, it is the steroidal neuromuscular-blocking agents pancuronium and vecuronium that, when introduced directly into the CNS, were likely to cause acute excitement and seizures, owing to accumulation of cytosolic calcium caused by activation of acetylcholine receptor ion channels. Unlike the two steroidal agents, neither atracurium nor laudanosine caused such accumulation of intracellular calcium. Just over two decades later with uninterrupted clinical availability of atracurium, there is now little doubt that laudanosine accumulation and related toxicity will likely ever be seen with the doses of atracurium that are administered in clinical practice.[42]
Laudanosine is also a metabolite of cisatracurium that, because of its identical structure to atracurium, undergoes chemodegradation via Hofmann elimination in vivo. Plasma concentrations of laudanosine generated are lower when cisatracurium is used.[42]
History
Atracurium besylate was first synthesized in 1974 by George H. Dewar,[49] a pharmacist and a medicinal chemistry doctoral candidate in John B. Stenlake's medicinal chemistry research group in the Department of Pharmacy at Strathclyde University, Scotland. Dewar first named this compound "33A74"[49] before its eventual emergence in the clinic as atracurium. Atracurium was the culmination of a rational approach to drug design to produce the first non-depolarizing non-steroidal skeletal muscle relaxant that undergoes chemodegradation in vivo. The term chemodegradation was coined by Roger D. Waigh, PhD,[50] also a pharmacist and a postdoctoral researcher in Stenlake's research group. Atracurium was licensed by Strathclyde University to The Wellcome Foundation Ltd. UK, which developed the drug (then known as BW 33A[51]) and its introduction to first human trials in 1979,[52][9] and then eventually to its first introduction (as a mixture of all ten stereoisomers[53]) into clinical anesthetic practice in the UK, in 1983, under the tradename of Tracrium.
The premise to the design of atracurium and several of its congeners stemmed from the knowledge that a bis-quaternary structure is essential for neuromuscular-blocking activity: ideally, therefore, a chemical entity devoid of this bis-quaternary structure via susceptibility to inactive breakdown products by enzymic-independent processes would prove to be invaluable in the clinical use of a drug with a predictable onset and duration of action. Hofmann elimination provided precisely this basis: It is a chemical process in which a suitably activated quaternary ammonium compound can be degraded by the mildly alkaline conditions present at physiological pH and temperature.[54] In effect, Hofmann elimination is a retro-Michael addition chemical process. It is important to note here that the physiological process of Hofmann elimination differs from the non-physiological Hofmann degradation process: the latter is a chemical reaction in which a quaternary ammonium hydoxide solid salt is heated to 100 °C, or an aqueous solution of the salt is boiled. Regardless of which Hofmann process is referenced, the end-products in both situations will be the same: an alkene and a tertiary amine.
The approach to utilizing Hofmann elimination as a means to promoting biodegradation had its roots in much earlier observations that the quaternary alkaloid petaline (obtained from the Lebanese plant Leontice leontopetalum) readily underwent facile Hofmann elimination to a tertiary amine called leonticine upon passage through a basic (as opposed to an acidic) ion-exchange resin.[55] Stenlake's research group advanced this concept by systematically synthesizing numerous quaternary ammonium β-aminoesters[56][57][58][59] and β-aminoketones[60] and evaluated them for skeletal muscle relaxant activity: one of these compounds,[52][58] initially labelled as 33A74,[49][61] eventually led to further clinical development, and came to be known as atracurium.
Atracurium's limited clinical utility for the future was presaged with the marketing approval of cisatracurium in 1995 under the tradename of Nimbex. Cisatracurium is the R-cis R-cis isomer component of the ten stereoisomers that comprise atracurium.[53] The pharmacodynamic and adverse effects profile of cisatracurium proved to be superior to that of atracurium, which rapidly led to decline in the use of atracurium. The clinical development of cisatracurium was undertaken by Burroughs Wellcome Co. (and its parent The Wellcome Foundation Ltd.), from 1992 to 1994, and by the time of its approval for use in humans by the US Food and Drug Administration, Burroughs Wellcome Co. had merged with Glaxo Inc., and Nimbex was subsequently marketed worldwide by GlaxoWellcome Inc.
References
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- ^ Stenlake JB, Waigh RD, Dewar GH, Hughes R, Chapple DJ. (1983). "Biodegradable neuromuscular blocking agents. Part 5. α,ω-Bisquaternary polyalkylene phenolic esters". Eur J Med Chem 18: 273–276.
- ^ Stenlake JB, Urwin J, Waigh RD, Hughes R. (1979). "Biodegradable neuromuscular blocking agents. II. Quaternary ketones". Eur J Med Chem 14 (1): 85–88.
- ^ Stenlake JB. (2001). "Chance, coincidence and atracurium". Pharm J 267 (7167): 430–441.
External links
- Neuromuscular blocking agents at the US National Library of Medicine Medical Subject Headings (MeSH)
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English Journal
- Effect of urethral infusion of atracurium besylate on manual bladder expression in dogs and cats with spinal cord injuries: a randomised trial.
- Galluzzi F1, De Rensis F2, Saleri R2, Spattini G1.
- The Veterinary record.Vet Rec.2015 May 23;176(21):545. doi: 10.1136/vr.102825. Epub 2015 Apr 28.
- The aim of this randomised trial was to assess the effect of urethral infusion of atracurium besylate in dogs and cats with signs of urinary retention secondary to lesions affecting spinal cord segments T3-L3. Eighteen dogs and six cats with urinary retention were examined and scored before treatmen
- PMID 25920417
- [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
- Pharmacological treatments for acute respiratory distress syndrome: systematic review.
- Duggal A1, Ganapathy A, Ratnapalan M, Adhikari NK.
- Minerva anestesiologica.Minerva Anestesiol.2015 May;81(5):567-88. Epub 2014 Jun 17.
- BACKGROUND: Our objective was to systematically review the effect of pharmacological therapies on mortality in patients with acute respiratory distress syndrome (ARDS), focusing on randomized controlled trials (RCTs) published since a previous review in 2004.METHODS: We updated previous searches and
- PMID 24937499
Related Links
- トラクリアム , アトラクリウムベシル酸 注射アンプルはに効果のあるお薬です。気になる副作用などについてはこちらをご覧下さい。また、トラクリアム , アトラクリウムベシル酸 注射アンプル と同様効果のある他のお薬も多数 ...
- Learn about the prescription medication Tracrium (Atracurium Besylate), drug uses, dosage, side effects, drug interactions, warnings, reviews and patient labeling. ... How to Report an Adverse Reaction to a Medication » "Potential ...
Related Pictures
★リンクテーブル★
| リンク元 | 「アトラクリウム」 |
「アトラクリウム」
- 英
- atracurium
- 化
- atracurium besylate
- 商
- Tracrium？、
- 関
- 筋弛緩薬
- 四級アンモニウム;神経筋遮断薬;競合性