Abstract:
BACKGROUND:Myocardial potassium channels are complexes formed by different subunits. The subunit composition may influence the cardiotoxic action of local anaesthetics. The effects of amide local anaesthetics on HERG channels co-expressed with the putative subunit MiRP1 have not been established. It is also unclear if the common polymorphism MiRP1(T8A) that predisposes individuals to drug-induced cardiac arrhythmia increases local-anaesthetic sensitivity of HERG/MiRP1 channels. This may suggest the presence of genetic risk factors for local-anaesthetic-induced cardiac arrhythmia. METHODS:Whole-cell patch-clamp recordings and site-directed mutagenesis were combined to compare local anaesthetic sensitivities of cloned and mutated human potassium channel subunits. The ion channels were activated by a protocol that approximated ventricular action potentials. RESULTS:The amide local anaesthetics bupivacaine, levobupivacaine and ropivacaine inhibited HERG channels at toxicologically relevant concentrations, with IC(50) values of 20 (SEM 2) micro M (n=29), 10 (1) micro M (n=40) and 20 (2) micro M (n=49), respectively. Hill coefficients were close to unity. There were no indications of qualitative differences in channel inhibition between the three anaesthetics. The putative subunit MiRP1 did not alter local anaesthetic sensitivity of HERG channels. The common single nucleotide polymorphism producing MiRP1(T8A) did not increase local anaesthetic sensitivity of HERG/MiRP1 channels. CONCLUSIONS:Amide local anaesthetics target HERG and HERG/MiRP1 channels with identical potency. The effects on these ion currents may significantly contribute to local-anaesthetic-induced cardiac arrhythmia. MiRP1(T8A) does not seem to confer an increased risk of severe cardiac side-effects to carriers of this common polymorphism.
journal_name
Br J Anaesthjournal_title
British journal of anaesthesiaauthors
Friederich P,Solth A,Schillemeit S,Isbrandt Ddoi
10.1093/bja/aeh026subject
Has Abstractpub_date
2004-01-01 00:00:00pages
93-101issue
1eissn
0007-0912issn
1471-6771pii
S0007-0912(17)36235-9journal_volume
92pub_type
杂志文章abstract:BACKGROUND:We investigated the effects of total i.v. anaesthesia (TIVA) and balanced anaesthesia (BAL) with sevoflurane on postoperative lung function in patients undergoing surgery in the prone position. METHODS:Sixty patients, aged 21-60 yr, undergoing elective lumbar disc surgery in the prone position were randomly...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,随机对照试验
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abstract::In a random, double-blind crossover trial using an ischaemic limb pain model we have assessed the speed of onset of analgesia after an i.v. bolus of equipotent doses of diamorphine and morphine in 12 healthy male volunteers. Pain and its subsequent relief were assessed by means of a visual analogue scale. Two of the s...
journal_title:British journal of anaesthesia
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journal_title:British journal of anaesthesia
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abstract::This review looks at the challenges faced when monitoring patients in the field environment. It is considered from the perspective of the UK Defence Medical Services and their experiences over the past 20 yr. The lessons learned are applicable to many other circumstances where a high standard of care, for a large spec...
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更新日期:2006-07-01 00:00:00
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更新日期:1989-04-01 00:00:00
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1980-03-01 00:00:00
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更新日期:1996-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:1992-05-01 00:00:00
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更新日期:2000-11-01 00:00:00
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pub_type: 杂志文章,多中心研究
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