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 |