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Table 2 Physiologic and pathologic conditions that can modify TCCS Doppler indices [3]

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

Increase
 Raised intracranial pressure
 Decreased cerebral perfusion pressure
 Hypocapnia
 Hypothermia
 Cerebral circulatory arrest
 Hyperviscosity
 Intracranial artery occlusion
 Advanced age (vessel stiffness)
Decrease
 Hyperemia
 Anemia, fever, high cardiac output, arterial hypertension
 Hypercapnia
 Vasospasm
 Intracranial artery stenosis
 Arteriovenous malformation
 Rewarming following hypothermia