Fig. 2.

Coupling of CSFp and SSp at baseline and during infusion. a Left: linear regression demonstrating the coupling between CSFp and SSp at baseline. Right: coupling between the pulse amplitude of CSFp and SSp at baseline. Recording of the amplitude was only possible in 7 out of the 10 cases. b Linear regression demonstrating the maintenance of the coupling between CSFp and SSp during infusion (left), the strong correlation of the changes between CSFp and SSp during infusion, when CSFp is increased by infusion of Hartmann’s solution, and the increase in CSFp is subsequently invoking parallel increases in SSp (middle). Right: correlation between the slopes of the amplitude-pressure regression lines of both CSFp and SSp