Diffuse Correlation Spectroscopy for Noninvasive Monitoring of Peripheral Perfusion During Cardiogenic Shock and...

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Critical Care Medicine

Background:

• Persistent microcirculatory impairment in cardiogenic shock (CS) despite improved macrocirculation predicts poor outcomes.
• Conventional methods for assessing microcirculation are limited, particularly during venoarterial extracorporeal membrane oxygenation (VA-ECMO).
• Diffuse correlation spectroscopy (DCS) offers a novel, noninvasive approach for continuous microvascular blood flow monitoring.

Purpose of the Study:

• To evaluate the utility of DCS in monitoring microcirculation during CS under VA-ECMO support.
• To assess DCS's ability to detect changes in microvascular blood flow in response to hemodynamic interventions.

Main Methods:

• CS was induced in beagle dogs via coronary ligation and ventricular fibrillation.
• VA-ECMO was initiated, followed by controlled reductions in VA-ECMO flow and administration of vasoconstrictors.
• Continuous measurements included mean arterial pressure (MAP), cardiac output (CO), and DCS-derived blood flow index (BFI), alongside other microcirculatory parameters.

Main Results:

• CS induction led to significant drops in MAP, CO, and microcirculatory indices, with DCS detecting peripheral flow loss.
• VA-ECMO restored MAP and oxygen saturation, with gradual recovery of DCS-BFI and skin blood flow (SBF).
• Reduced VA-ECMO flow and vasopressor administration improved MAP but did not restore DCS-BFI, indicating persistent microcirculatory dysfunction.

Conclusions:

• DCS reliably tracked microvascular alterations in CS patients supported by VA-ECMO, irrespective of flow pulsatility.
• DCS shows promise for early detection of microcirculatory dysfunction in CS.
• This technique may aid in optimizing therapeutic strategies for CS patients on VA-ECMO.