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GRADE 0:
ABSENT

GRADE 1:
MINIMAL

GRADE 2:
BLUNTED

GRADE 3:
DAMPENED

- MFV of >80 cm/s AND velocity difference >30%
compared to control side or
GRADE 4: - if both affected and comparison sides have MFV
STENOTIC <80 cm/s due to low end-diastolic velocities, MFV
>30% compared to the control side AND signs of
turbulence.

GRADE 5: - >30% mean velocity difference compared to control
NORMAL - Similar waveform shapes compared to control

Fig. 1. Clasificación TIBI. Imagen de Stroke. 2001 Jan;32(1):89-93

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