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Effect of citalopram on ouabain‐induced arrhythmia in isolated guinea‐pig atria
Author(s) -
Pousti Abbas,
Malihi Golrokh,
Naghibi Bijan
Publication year - 2003
Publication title -
human psychopharmacology: clinical and experimental
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.461
H-Index - 78
eISSN - 1099-1077
pISSN - 0885-6222
DOI - 10.1002/hup.446
Subject(s) - ouabain , asystole , chemistry , citalopram , medicine , pharmacology , endocrinology , serotonin , sodium , receptor , organic chemistry
The effect of citalopram (CTP) a selective serotonin reuptake inhibitor agent was studied on ouabain‐induced arrhythmia in spontaneously beating isolated guinea‐pig atria. CTP (2–32 μg/ml) produced a dose‐dependent decrease in the force of contractions (7–62%), and in the rate of contractions (11–72%). Pre‐administration of the atria with CTP inhibited the ouabain‐induced arrhythmia in isolated atria. Ouabain alone (1.2 μg/ml) produced arrhythmia at 4.5 min, and asystole at 20.7 min. Pretreatment with CTP (8 μg/ml) significantly increased the time of onset of arrhythmia to 9.5 min. In addition CTP prolonged the beating of atria (survival time) to more than 56 min, and inhibited the occurrence of asystole. These findings indicate that CTP produces direct cardiac action, probably due to the inhibition of cardiac Na + and Ca 2+ channels. Moreover our results suggest that CTP may reduce the membrane conductance through inhibition of ionic channels which decrease ouabain‐induced arrhythmia. Copyright © 2002 John Wiley & Sons, Ltd.