Energy metabolism in heart failure

Area of Science:

• Cardiology
• Metabolic Medicine
• Biochemistry

Background:

• Heart failure (HF) impairs the heart's ability to meet the body's energy demands.
• The precise mechanisms behind cardiac intracellular abnormalities in HF are not fully understood.
• HF is associated with peripheral symptoms like muscle fatigue and exercise intolerance.

Purpose of the Study:

• To review energy metabolism alterations in chronic heart failure (HF).
• To describe normal energy metabolism in cardiac and skeletal muscles.
• To detail the changes in energy metabolism occurring in chronic HF.

Main Methods:

• Literature review focusing on energy metabolism in chronic heart failure.
• Brief description of normal muscle energy metabolism.
• Discussion of alterations in cardiac and skeletal muscle energy metabolism in HF.

Main Results:

• Abnormalities in metabolic pathways decrease energy production, transfer, and utilization in HF.
• Skeletal muscle shows reduced mitochondrial ATP production and impaired phosphotransfer kinase activity.
• Decreased expression of mitochondrial factors and proteins contributes to energy starvation in HF.

Conclusions:

• Altered energy metabolism affects both cardiac and skeletal muscles, suggesting a generalized metabolic myopathy in HF.
• Reduced mitochondrial function and impaired energy transfer are key features of chronic HF.
• These metabolic changes underlie the reduced exercise capacity and fatigue experienced by HF patients.