Role of renal Na+,K+-ATPase in the regulation of sodium excretion under normal conditions and in acute congestive heart failure

Margaret A. Lloyd, Sharon M. Sandberg, Brooks Sayre Edwards

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Background. Cardiac glycosides have traditionally been used as inotropic agents in the treatment of congestive heart failure (CHF). The renal actions of cardiac glycosides independent of inotropic effects are not characterized. The presence of endogenous digitalis-like factors (EDLFs) with characteristic Na+,K+-ATPase activity has been postulated in volume-expanded states such as CHF, and recent studies have demonstrated that at least one EDLF shares structural homology with ouabain. This study was undertaken to evaluate the renal actions of ouabain in normal dogs and those with CHF. Methods and Results. After surgical preparation, normal dogs (n=6) and dogs in pacing-induced CHF (n=6) received intrarenal ouabain in sequential doses of 0.167 μg/kg/min, 0.334 μg/kg/min, and 0.668 μg/kg/min. Hemodynamics and renal function were evaluated during the infusion. There was no change in heart rate or mean arterial pressure during the infusion compared with baseline in both groups. Sodium excretion and urine volume significantly increased in both groups. Plasma renin activity, activated by the onset of pacing in the CHF group, was inhibited by the administration of intrarenal ouabain in this group only. Conclusions. These studies demonstrate that ouabain has diuretic and natriuretic actions independent of cardiac hemodynamics that are preserved in CHF. Furthermore, intrarenal ouabain suppresses activation of renin in CHF.

Original languageEnglish (US)
Pages (from-to)1912-1917
Number of pages6
JournalCirculation
Volume85
Issue number5
StatePublished - May 1992

Fingerprint

Ouabain
Heart Failure
Sodium
Kidney
Cardiac Glycosides
Dogs
Renin
Hemodynamics
sodium-translocating ATPase
Diuretics
Arterial Pressure
Heart Rate
Urine

Keywords

  • Endogenous digitalis-like factors
  • Na,K-ATPase
  • Ouabain
  • Plasma renin activity

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Role of renal Na+,K+-ATPase in the regulation of sodium excretion under normal conditions and in acute congestive heart failure. / Lloyd, Margaret A.; Sandberg, Sharon M.; Edwards, Brooks Sayre.

In: Circulation, Vol. 85, No. 5, 05.1992, p. 1912-1917.

Research output: Contribution to journalArticle

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