Table 1 Summary of microcirculatory parameters quantitative metrics
From: Microcirculatory perfusion disturbances in septic shock: results from the ProCESS trial
Name | Abbreviation | Description |
|---|---|---|
Microcirculatory flow index | MFI | A qualitative assessment of flow over quadrants. Predominant (mode) flow velocity of visualized vessels is determined for each image quadrant. MFI is computed as the average of the predominant flow classification of small vessels over the four image quadrants. |
Heterogeneity index | HETERO | A measure of flow heterogeneity. Computed as the maximum MFI quadrant value minus minimum MFI quadrant value divided by mean MFI. |
Total vascular density | TVD | A measure of all vessels over the field of view. Computed as total length of small vessels divided by total area of field of view. |
Proportion of perfused vessels | PPV | A measure of the lineal proportion of perfused vessels. Computed as total length of perfused small vessels (semiqualitative velocity score 2 or greater)a divided by total length of small vessels. |
Perfused vascular density | PVD | A measure of the perfused vessel lineal density. Computed as proportion of perfused vessels multiplied by total vessel density. |
De Backer score | De Backer | An alternate measure of total vessel density. A grid is formed using three equally spaced vertical and three horizontal lines over image area. Computed as number of vessels crossing grid lines divided by the total length of the lines. |