Microcirculation-guided resuscitation in sepsis: the next frontier?

Area of Science:

• Critical Care Medicine
• Hemodynamics
• Sepsis Pathophysiology

Background:

• Sepsis-induced microcirculatory dysfunction contributes to tissue dysoxia and organ failure.
• Standard hemodynamic monitoring may not reflect microvascular perfusion status.
• Loss of hemodynamic coherence is observed in septic shock.

Purpose of the Study:

• To review the role of sublingual videomicroscopy in assessing sepsis-related microcirculatory alterations.
• To evaluate the impact of resuscitative treatments on microvascular function.
• To discuss limitations and future directions for bedside microcirculation assessment.

Main Methods:

• Utilized sublingual videomicroscopy for real-time, non-invasive assessment of sublingual microvascular blood flow.
• Analyzed microvascular perfusion in septic patients and its correlation with outcomes.
• Explored the effects of fluid resuscitation, vasopressors, and inotropes on microcirculation.

Main Results:

• Detected significant alterations in sublingual microvascular perfusion during sepsis, associated with poor outcomes.
• Demonstrated that optimized macro-hemodynamics do not always improve microvascular perfusion.
• Highlighted the discrepancy between macro- and microcirculatory responses ('hemodynamic coherence').

Conclusions:

• Sublingual videomicroscopy is a valuable tool for monitoring microvascular dysfunction in sepsis.
• Microvascular monitoring is advocated for guiding and titrating resuscitative therapies in septic shock.
• Overcoming current limitations is crucial for widespread clinical adoption of bedside microcirculation assessment.