Aortic Valve Embryology, Mechanobiology, and Second Messenger Pathways: Implications for Clinical Practice

Area of Science:

• Cardiovascular Science
• Anatomy and Physiology
• Surgical Innovation

Background:

• Leonardo Da Vinci first detailed aortic root anatomy, evolving to understand the aortic valve (AV) and root as a dynamic functional unit.
• The AV is now viewed as an interconnected apparatus, interacting with adjacent structures via humoral and mechanical stimuli, not a static entity.
• This paradigm shift influences surgical strategies for valvular disease, moving beyond simple replacement to functional restoration.

Purpose of the Study:

• To provide a structured overview of the embryology, hemodynamics, and messenger pathways of the healthy and diseased aortic valve (AV).
• To explore the clinical implications of these pathways for cardiothoracic surgeons and cardiologists.
• To relate current knowledge to existing treatment alternatives and inform clinical decision-making.

Main Methods:

• Review of historical anatomical and physiological studies on the aortic valve and root.
• Analysis of current literature on valvular disease treatment strategies, focusing on hemodynamic principles.
• Synthesis of information on embryology, hemodynamics, and molecular signaling pathways relevant to AV function.

Main Results:

• Native AV and root components facilitate an efficient Venturi effect for optimal opening and reduced left ventricular load.
• Receptors on native AV leaflets respond to blood flow and shear-stress, initiating messenger pathways.
• These under-acknowledged physiological and hemodynamic processes offer potential targets for novel therapeutic agents and innovative treatments.

Conclusions:

• Understanding the dynamic nature and complex hemodynamics of the aortic valve and root is crucial for advancing valvular disease treatment.
• Valve-conserving and hemodynamically centered surgical approaches, like the Ross procedure, better recapitulate native function than prostheses.
• Further research into AV messenger pathways may yield targets to halt or reverse valve degeneration, improving clinical practice.