Vasospasm velocity is considered normal if it is below what value?

Vasospasm velocity is considered normal if it is below what value?

• A. <120 cm/s
• B. >120 cm/s
• C. 200 cm/s
• D. 60 cm/s

Answer: (A)

Vasospasm causes the affected intracranial artery to narrow, so the blood must flow faster to maintain cerebral perfusion. In Doppler assessments of the middle cerebral artery, normal mean velocity is typically up to about 120 cm/s. Velocities above this threshold raise concern for vasospasm, with higher values suggesting greater severity (roughly mild around 120–140, moderate 140–200, severe >200). Therefore, a velocity below 120 cm/s is considered normal.

Vasospasm causes the affected intracranial artery to narrow, so the blood must flow faster to maintain cerebral perfusion. In Doppler assessments of the middle cerebral artery, normal mean velocity is typically up to about 120 cm/s. Velocities above this threshold raise concern for vasospasm, with higher values suggesting greater severity (roughly mild around 120–140, moderate 140–200, severe >200). Therefore, a velocity below 120 cm/s is considered normal.