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 |