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Oxidative stress and heart failure

N Singh1, A K Dhalla, C Seneviratne

  • 1Division of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, Unviersity of Manitoba, Winnipeg, Canada.

Molecular and Cellular Biochemistry
|June 7, 1995
PubMed

Insights

Heart hypertrophy increases antioxidant reserve, reducing oxidative stress. However, heart failure depletes this reserve, increasing oxidative stress and leading to myocardial dysfunction, highlighting the role of antioxidants in heart health.

Area of Science:

  • Cardiology
  • Biochemistry
  • Pathophysiology

Background:

  • The transition from cardiac hypertrophy to heart failure involves unknown mechanisms.
  • Oxidative stress is increasingly recognized as a key factor in heart failure development.

Purpose of the Study:

  • To investigate changes in antioxidant status during cardiac hypertrophy and heart failure.
  • To elucidate the role of oxidative stress in the progression of heart disease.

Main Methods:

  • Induction of cardiac hypertrophy in rats and guinea pigs via pressure overload.
  • Assessment of antioxidant reserve and oxidative stress markers in hypertrophied and failing hearts.
  • Evaluation of antioxidant treatment efficacy in experimental heart failure models.

Main Results:

  • Cardiac hypertrophy was associated with increased antioxidant reserve and decreased oxidative stress.
  • Hypertrophied hearts exhibited enhanced tolerance to oxidative challenges.
  • Heart failure stages (acute and chronic) showed reduced antioxidant reserve and elevated oxidative stress.
  • Antioxidant treatment demonstrated protective effects in both acute and chronic heart failure.

Conclusions:

  • Adequate antioxidant reserve is crucial for maintaining myocardial function.
  • Depletion of antioxidant reserve contributes to the development of heart failure.
  • Targeting oxidative stress with antioxidants may be a viable therapeutic strategy for heart failure.

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