Cardiogenic Shock: Reflections at the Crossroad Between Perfusion, Tissue Hypoxia, and Mitochondrial Function

Area of Science:

• Cardiology
• Physiology
• Biochemistry

Background:

• Cardiogenic shock diagnosis traditionally relies on hypotension and hypoperfusion, but these metrics are often insufficient in modern practice.
• Patients present with advanced cardiovascular disease and multiorgan dysfunction, complicating assessment.
• Understanding cellular-level hypoxia, perfusion, congestion, and end-organ dysfunction is crucial for effective management.

Purpose of the Study:

• To evaluate the lactate to pyruvate ratio as a more accurate indicator of cellular hypoxia in cardiogenic shock.
• To discuss the physiological impacts of hypoxia and congestion on key organs (liver, intestines, kidneys).
• To explore personalized management strategies for cardiogenic shock.

Main Methods:

• Review of evidence supporting the lactate to pyruvate ratio for discriminating cellular hypoxia.
• Discussion of organ-specific susceptibility to hypoxia based on functional architecture.
• Exploration of concepts like contractile reserve, fluid responsiveness, and tissue oxygenation.

Main Results:

• Elevated lactate levels may not solely indicate hypoxia, being influenced by mitochondrial function, organ clearance, and medication.
• The lactate to pyruvate ratio shows potential as a discriminator of cellular hypoxia.
• Organ-specific physiology and interactions are key to understanding shock progression.

Conclusions:

• Lactate levels alone are limited for tailoring cardiogenic shock therapy.
• The lactate to pyruvate ratio offers a more nuanced view of cellular oxygenation.
• Personalized management considering multiple physiological factors is essential for cardiogenic shock patients.