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Pharmacological characterisation of sodium channels in sinoatrial node pacemaking in the rat heart.

Abstract：

:Blockade of sodium channels located in the sinoatrial node can slow diastolic depolarisation rate, recorded in vitro. The objective was therefore to determine whether these blockers could slow heart rate in vivo. The heart rate was firstly measured in spontaneously beating, isolated rat heart atria in the presence of different voltage gated sodium channel blockers. Tetrodotoxin and lidocaine slightly reduced heart rate whereas KC 12291 and R 56865, which mainly interact with the persistent component of the sodium current, concentration dependently and potently induced bradycardia. In the pithed rat, tetrodotoxin induced statistically significant decreases heart rate, maximal effects were: -32.2+/-6.1 beat per min. KC 12291 and R 56865 dose-dependently induced bradycardia (Delta heart rate obtained, -55.1+/-5.2 beat per min, P<0.05, and -71.9+/-8.5 bpm, P<0.05, respectively). In conclusion, voltage gated sodium channel blockers rather selective for the persistent current, exert a potent bradycardic effect in the rat.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Létienne R,Vié B,Le Grand B

doi

10.1016/j.ejphar.2005.11.035

keywords:

subject

Has Abstract

pub_date

2006-01-20 00:00:00

pages

243-9

issue

3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(05)01221-5

journal_volume

530

pub_type

杂志文章

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