What question did this study set out to answer?

This study aims to assess diffuse correlation spectroscopy (DCS) as a non-invasive method for monitoring microcirculation during cardiogenic shock (CS) while on VA-ECMO support.

March 28, 2026

Diffuse Correlation Spectroscopy for Non-invasive Monitoring of Peripheral Perfusion During Cardiogenic Shock and VA-ECMO Support: An Experimental Study

Key Points

This study aims to assess diffuse correlation spectroscopy (DCS) as a non-invasive method for monitoring microcirculation during cardiogenic shock (CS) while on VA-ECMO support.
Induced cardiogenic shock in seven beagle dogs via coronary ligation and ventricular fibrillation.
Used VA-ECMO to support circulation under nonpulsatile flow for 90 minutes.
Monitored various parameters, including mean arterial pressure, cardiac output, and DCS-derived microcirculatory indices.
Correlation ligation caused significant declines in mean arterial pressure (MAP) and cardiac output.
Initiation of VA-ECMO restored MAP and tissue oxygen saturation but did not restore microvascular flow efficiently as shown by BFI.
Reduction of VA-ECMO flow resulted in decreased MAP and BFI values, indicating ongoing microcirculatory impairment.

Abstract

Introduction: In cardiogenic shock (CS), persistent microcirculatory impairment despite improved macrocirculatory parameters is associated with poor outcomes. Therapeutic strategies must therefore address both macro- and micro-circulation. Conventional microcirculatory measures have limitations, especially during venoarterial extracorporeal membrane oxygenation support (VA-ECMO). Diffuse correlation spectroscopy (DCS) is a novel optical technique enabling continuous, noninvasive evaluation of microvascular blood flow. This study evaluated DCS for monitoring microcirculation in CS under VA-ECMO. Methods: Seven male beagle dogs (median weight 10.1 kg) underwent CS induction by coronary ligation followed by ventricular fibrillation (VF). VA-ECMO (80-100 mL·kg⁻¹·min⁻¹) was initiated 5 min after VF onset and maintained for 90 minutes under nonpulsatile flow. After stabilization, VA-ECMO flow was reduced from 100 to 30 mL·kg⁻¹·min⁻¹, and mean arterial pressure (MAP) was increased to ≥65 mmHg using vasoconstrictors. Measurements included MAP, cardiac output (CO), and microcirculatory parameters DCS-derived blood flow index (BFI), perfusion index (PI), skin blood flow (SBF), tissue oxygen saturation, mixed venous oxygen saturation (SvO₂), and lactate. Results: Coronary ligation caused progressive declines in MAP, CO, and microcirculatory indices. MAP (median interquartile range) was 109.6 95.8, 119.7 at baseline and 45.7 26.3, 51.6 mmHg at CS onset. During VF, PI became unmeasurable while BFI rapidly fell to near zero, detecting peripheral flow loss under nonpulsatile conditions. VA-ECMO initiation restored MAP and SvO₂, with gradual recovery of BFI and SBF. Reducing VA-ECMO flow lowered MAP (64.7 62.3, 69.9 to 36.4 34.4, 44.6 mmHg) and BFI (3.6 3.4, 5.1 to 1.0 0.8, 1.2 10⁻⁹·cm²·s⁻¹). Vasopressors increased MAP (83.1 79.0, 89.1 mmHg) but failed to improve BFI (1.5 1.3, 2.1 10⁻⁹·cm²·s⁻¹), indicating persistent microcirculatory impairment. Conclusions: DCS continuously detected microvascular changes during CS and VA-ECMO support regardless of pulsatility. DCS may be useful for early identification of microcirculatory dysfunction and optimization of therapy in CS.

Bookmark

Cite This Study

Matsushita et al. (Thu,) studied this question.

synapsesocial.com/papers/69c771508bbfbc51511e134f https://doi.org/https://doi.org/10.1097/shk.0000000000002842

Bookmark