Continuous detection of cerebral vasodilatation and vasoconstriction using intracranial pulse morphological template matching.

Investigating the trend of CVRi during hyperventilation reveals that in fact for 10 of these subjects, the calculated cerebrovascular resistance index also did not demonstrate an increasing trend expected during a vasoconstriction event ( figure 4 -b and 4-d show the P ET CO2 and CVRi for one of the 10 subjects).

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