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Table 1 Physiologic and pathologic conditions that can modify TCCS flow velocities [3]

From: Transcranial Doppler ultrasound in the ICU: it is not all sunshine and rainbows

Increase
 Hyperemia
 Fever, anemia, high cardiac output, arterial hypertension
 Vasospasm
 Intracranial arterial stenosis (for example atherosclerotic plaque)
 Hypercapnia
 Bacterial meningitis
 Pre-eclampsia
Decrease
 Raised intracranial pressure
 Decreased cerebral perfusion pressure
 Cerebral circulatory arrest
 Hypocapnia
 Hypothermia
 Wrong insonation angle