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Videocapillaroscopic parameters | Criteria |
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Distribution of the capillaries | |
Regular | Homogenous distribution of capillaries |
Altered | Nonhomogenous distribution of capillaries |
Density of the capillaries | |
Normal | 9–13 capillaries/mm |
Increased | >13 capillaries/mm |
Decreased | <9 capillaries/mm or avascular area |
Diameter of the capillaries | |
Normal | The diameter of the afferent limb (6 to 19 μm) and the diameter of the efferent limb (8–20 μm), venous limb width ratio: arterial limb no greater than 2 : 1 |
Enlargement of the top part of the loop | Diameter of the limbs larger than average |
Enlargement of the efferent limb | Diameter of the limbs larger than average |
Length of the capillaries | |
Normal | Approximately 400 μm |
Elongated | >750 μm |
Extravasation | |
Absent | No extravasations |
Single | Present in 1-2 fingers |
Multiple | Present in >2 fingers |
Subpapillary venular plexus visibility | |
Invisible | |
1-2 fingers | Visible in 1-2 fingers |
>2 fingers | Visible in >2 fingers |
Background colour | |
Pale | |
Pink | |
Reddish | |
Morphology of the capillaries | |
Normal | Appearance like an inverted letter U |
Tortuous capillaries—regular appearance | Single crossovers |
Tortuous capillaries—irregular appearance | Multiple crossovers or appearance like “treble clef” loop, “antler” loop, “trefoil” loop or meandering appearance with single/multiple crossovers |
The number of tortuous capillaries | |
Single | <5 at least in two fingers |
Multiple | >5 at least in two fingers |
Branching capillaries | |
Present | At least one such loop in two fingers |
Coiled capillaries | |
Present | At least one such loop in two fingers |
Features of the capillary neoformation | |
Present | Thin, branching from one limb, or thin interconnection between the limbs (at least one such loop in two fingers) |
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