Age-related changes in electromechanical properties of canine ventricular muscle: effect of ouabain.

Abstract:

:In this report, alterations between the electrical and mechanical responses of isolated neonatal and adult canine ventricular muscle preparations before and after ouabain exposure are described. No significant differences were observed between the two age groups in the concentration-dependent effects of ouabain on increasing contractile force or decreasing maximum diastolic transmembrane potential. The action potential plateau duration was decreased by high concentrations of ouabain (0.3-1 microM) in both neonatal and adult ventricular muscle. In addition, more adult preparations developed delayed afterdepolarizations associated with aftercontractions after exposure to ouabain than did neonatal preparations. These results suggest that the higher glycoside tolerance in neonatal dogs as compared with adults may be due in part to differences in the mechanisms responsible for development of abnormal ventricular automaticity. The results may also indicate that immature animals do not require higher glycoside levels to produce augmentation of cardiac contractility.

journal_name

J Cardiovasc Pharmacol

authors

Lathrop DA,Varró A,Gaum WE,Kaplan S

doi

10.1097/00005344-198911000-00002

subject

Has Abstract

pub_date

1989-11-01 00:00:00

pages

681-7

issue

5

eissn

0160-2446

issn

1533-4023

journal_volume

14

pub_type

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