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Titolo:
Rate-dependent blockade of a potassium current in human atrium by the antihistamine loratadine
Autore:
Crumb, WJ;
Indirizzi:
Tulane Univ, Sch Med, Dept Pediat, Div Cardiol, New Orleans, LA 70112 USA Tulane Univ New Orleans LA USA 70112 v Cardiol, New Orleans, LA 70112 USA
Titolo Testata:
BRITISH JOURNAL OF PHARMACOLOGY
fascicolo: 3, volume: 126, anno: 1999,
pagine: 575 - 580
SICI:
0007-1188(199902)126:3<575:RBOAPC>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
OUTWARD CURRENT; TERFENADINE; CHANNEL; ASTEMIZOLE; OVERDOSE;
Keywords:
antihistamine loratadine; human; potassium current; transient outward current; atria;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Crumb, WJ Tulanes,niv, Sch Med, Dept Pediat, Div Cardiol, 1430 Tulane Ave,New Orlean Tulane Univ 1430 Tulane Ave New Orleans LA USA 70112 New Orlean
Citazione:
W.J. Crumb, "Rate-dependent blockade of a potassium current in human atrium by the antihistamine loratadine", BR J PHARM, 126(3), 1999, pp. 575-580

Abstract

1 The antihistamine loratadine is widely prescribed for the treatment of symptoms associated with allergies. Although generally believed to be free of adverse cardiac effects, there are a number of recent reports suggesting that loratadine use may be associated with arrhythmias, in particular atrial arrhythmias.2 Nothing is known regarding the potassium channel blocking properties of loratadine in human cardiac cells. Using the whole-cell patch clamp technique, the effects of loratadine on the transient outward K current (I-to), sustained current (I-sus), and current measured at -100 mV (I-Kl and I-ns), the major inward and outward potassium currents present in human atrial myocytes, were examined in order to provide a possible molecular mechanism for the observed atrial arrhythmias reported with loratadine use.3 Loratadine rate-dependently inhibited I-to at therapeutic concentrationswith 10 nM loratadine reducing I-to amplitude at a pacing rate of 2 Hz by 34.9 +/- 6.0%. In contrast, loratadine had no effect on either I-sus or current measured at -100 mV.4 These results may provide a possible mechanism for the incidences of supraventricular arrhythmias reported with the use of loratadine.

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Documento generato il 22/09/18 alle ore 01:39:09