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Aldosterone antagonism in an inflammatory state: evidence for myocardial protection

Felix J A Ramires1, Vera M C Salemi, Barbara M Ianni

  • 1Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil. carfelix@incor.usp.br

Journal of the Renin-Angiotensin-Aldosterone System : JRAAS
|November 10, 2006
PubMed

Insights

Spironolactone improved survival and reduced cardiac remodeling in a Chagas cardiomyopathy model. This aldosterone antagonist therapy attenuated myocardial inflammation and interstitial collagen in infected hamsters.

Area of Science:

  • Cardiology
  • Pharmacology
  • Tropical Medicine

Background:

  • Chagas' disease is a primary cause of dilated cardiomyopathy in South and Central America.
  • It is characterized by inflammatory cardiomyopathy, necessitating novel therapeutic strategies.
  • Aldosterone antagonism is explored for its potential in managing this condition.

Purpose of the Study:

  • To investigate the efficacy of spironolactone in mitigating myocardial remodeling in a Chagas cardiomyopathy model.
  • To evaluate the impact of spironolactone on cardiac structure and function in infected hamsters.

Main Methods:

  • Sixty Sirius Hamsters were divided into control, infected, and infected plus spironolactone groups.
  • Echocardiography assessed left ventricular end-diastolic diameter (LVEDD), fractional shortening (FS), and isovolumic relaxation time (IRT).
  • Interstitial collagen volume fraction (ICVF) and myocardial inflammation were quantified.

Main Results:

  • Spironolactone significantly improved survival in the chronic phase of Chagas' disease (p<0.04).
  • Treatment reduced LVEDD/BW and IRT, while attenuating ICVF and myocardial inflammation.
  • While FS showed no statistical difference, spironolactone mitigated adverse cardiac remodeling indicators.

Conclusions:

  • Spironolactone effectively attenuated myocardial remodeling in Chagas cardiomyopathy.
  • The drug reduced mortality during the chronic phase and decreased inflammatory infiltration.
  • Aldosterone antagonism presents a promising therapeutic avenue for Chagas cardiomyopathy.
Abstract

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