Article Text

PDF

Haemodynamic, renal sodium handling, and neurohormonal effects of acute administration of low dose losartan, an angiotensin II receptor antagonist, in preascitic cirrhosis
  1. N Girgrah,
  2. P Liu,
  3. J Collier,
  4. L Blendis,
  5. F Wong
  1. Department of Medicine, The Toronto Hospital, University of Toronto, Ontario, Canada
  1. Dr F Wong, Room 220, 9th Floor, Eaton Wing, Toronto Hospital, 200 Elizabeth Street, Toronto M5G 2C4, Ontario, Canada

Abstract

BACKGROUND The renin-angiotensin system may be implicated in the subtle sodium handling abnormality in preascitic cirrhosis.

AIMS To assess the role of angiotensin II in sodium homoeostasis in preascitic cirrhosis, using losartan, its receptor antagonist.

PATIENTS Nine male, preascitic cirrhotic patients, and six age matched, healthy male controls.

METHODS A dose response study using 2.5, 5, 7.5, and 10 mg of losartan was performed on a daily 200 mmol sodium intake, followed by repeat studies with the optimal dose, 7.5 mg of losartan, to determine its effects on systemic and renal haemodynamics, renal sodium handling, and neurohumoral factors.

RESULTS Preascitic cirrhotic patients had significantly reduced baseline urinary sodium excretion compared with controls (154 (8) versus 191 (12) mmol/day, p<0.05), associated with significantly reduced systemic angiotensin II levels (6.0 (1.7) versus 39.5 (10.0) pmol/l, p=0.002). Losartan 7.5 mg normalised renal sodium handling in the preascitic cirrhotic patients (202 (12) mmol/day, p=0.05 versus baseline), without any change in systemic or renal haemodynamics, but with significantly increased systemic angiotensin II levels (7.8 (2.3) pmol/l, p=0.05 versus baseline). Losartan had no effect on renal sodium handling in controls.

CONCLUSIONS In preascitic cirrhotic patients, the subtle renal sodium retention, paradoxically associated with low systemic neurohumoral factor levels, is improved with low dose losartan, suggesting the involvement of angiotensin II via its direct action on the renal tubule.

  • sodium retention
  • preascitic cirrhosis
  • renin-angiotensin-aldosterone system
  • angiotensin II receptor antagonist
  • renal haemodynamics

Statistics from Altmetric.com

Footnotes

  • Abbreviations used in this paper:
    ACE
    angiotensin converting enzyme
    GFR
    glomerular filtration rate
    MAP
    mean arterial pressure
    PRA
    plasma renin activity
    RAAS
    renin-angiotensin-aldosterone system
    RPF
    renal plasma flow
    RVR
    renal vascular resistance
    SNS
    sympathetic nervous system
    SVR
    systemic vascular resistance

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.