Continuous cerebral autoregulation monitoring by improved cross-correlation analysis: comparison with the cuff deflation test.

Objectives: To improve the cross-correlation method for noninvasive, continuous monitoring of cerebral autoregulation, to evaluate this method in humans with intact and impaired autoregulatory capacity, and to compare it to the cuff deflation test.

Design And Setting: Prospective study in the intensive care unit of a university hospital.

Patients And Participants: Fourteen patients with severe head injury, six patients with subarachnoid hemorrhage, and nine healthy volunteers.