Heart failure: pathophysiology and clinical picture

Area of Science:

• Cardiology
• Pathophysiology

Background:

• Decompensated heart failure (HF) is prevalent but poorly defined and understudied.
• HF involves complex mechanisms including pump dysfunction, neurohormonal activation, and salt-water retention.
• Early cardiac damage and remodeling initiate the HF cascade.

Purpose of the Study:

• To elucidate the poorly defined mechanisms underlying decompensated heart failure (HF).
• To detail the sequential pathophysiological steps contributing to HF development and worsening.
• To correlate underlying mechanisms with the varied clinical presentations of HF.

Main Methods:

• Review of existing literature on heart failure pathophysiology.
• Analysis of the sequential development of cardiac damage, neurohormonal activation, and fluid retention.
• Correlation of molecular and structural changes with clinical manifestations.

Main Results:

• HF progression involves initial cardiac damage followed by compensatory neurohormonal activation and fluid retention.
• These compensatory mechanisms become detrimental in later stages, disrupting cardiocirculatory homeostasis.
• Structural changes like myofilament loss, apoptosis, and cytoskeletal disorganization contribute significantly.
• Disturbances in calcium homeostasis, receptor signaling, and collagen synthesis are also implicated.

Conclusions:

• Decompensated heart failure results from a complex interplay of cardiac injury, maladaptive neurohormonal responses, and fluid imbalance.
• Progressive structural and molecular alterations drive HF worsening.
• The diverse clinical picture of HF is explained by the combination of pulmonary congestion, organ perfusion status, coronary disease, fluid retention, and systemic pressure.