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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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A Mitochondrial Basis for Heart Failure Progression.

William D Watson1,2, Per M Arvidsson3,4,5, Jack J J Miller3,6

  • 1Division of Cardiovascular Medicine, University of Cambridge, Cambridge, UK. ww265@cam.ac.uk.

Cardiovascular Drugs and Therapy
|June 15, 2024
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Summary

The healthy heart perfectly balances energy supply and demand. Heart failure disrupts this balance, impairing ATP production due to issues like calcium overload and oxidative stress.

Keywords:
ATPCalciumHeart failureMitochondriaRedox

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Area of Science:

  • Cardiology
  • Biochemistry
  • Cellular Physiology

Background:

  • The human heart requires 6 kg of ATP daily for mechanical and metabolic functions.
  • Cellular mechanisms, including ADP/AMP signaling and myocyte calcium concentrations, regulate ATP supply and demand.
  • Calcium/calmodulin-dependent protein kinase (CaMKII) is crucial for adapting to increased cardiac workload.

Purpose of the Study:

  • To review the mechanisms linking increased cardiac energy demand to impaired ATP supply in heart failure.
  • To explore the pathological factors contributing to this energy imbalance.

Main Methods:

  • Literature review focusing on cardiac energy metabolism and heart failure pathophysiology.
  • Analysis of the roles of calcium handling, oxidative stress, mitochondrial function, and DAMPs.

Main Results:

  • In healthy hearts, ATP supply and demand are precisely matched through intricate signaling pathways.
  • In heart failure, dysregulation of calcium handling, increased oxidative stress, mitochondrial abnormalities, and DAMPs disrupt ATP production.
  • CaMKII dysfunction is implicated in the impaired adaptive response to workload in failing hearts.

Conclusions:

  • Heart failure is characterized by a critical imbalance between ATP supply and demand.
  • Pathological mechanisms including calcium dysregulation, oxidative stress, and mitochondrial damage contribute to impaired cardiac energy metabolism.
  • Understanding these links is vital for developing therapeutic strategies for heart failure.