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Microcirculation parameter | Information provided | Measurement |
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Microvascular flow index (MFI) | Perfusion quality (for small, medium, and large vessels*) | The image is divided into four quadrants; a number is assigned for each quadrant according to the predominant type of flow (0 = no flow; 1 = intermittent; 2 = sluggish; 3 = continuous). The MFI results from the averaged values. |
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De Backer score (n/mm) | Vessel density | The image is divided by 3 vertical and 3 horizontal lines; the De Backer score is calculated as the number of vessels crossing the lines divided by the total length of the lines |
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Total vessel density (mm/mm2) | Vessel density (for small, medium, and large vessels*) | Total length of vessels is divided by the total surface of the analyzed area |
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Perfused vessel density (mm/mm2) | Functional vessel density (for small, medium, and large vessels*) | Total length of perfused vessels (sluggish or continuous) is divided by the total surface of the analyzed area |
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Proportion of perfused vessels (%) | Perfusion quality (for small, medium, and large vessels*) | 100* number of perfused vessels is divided by the total number of vessels |
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Flow heterogeneity index (FHI) | Perfusion heterogeneity | The difference between the highest MFI and the lowest MFI is divided by the mean MFI. MFI is intended as the averaged MFI of each site |
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