Figure 3. Linear correlation analysis of cc-TQ and PP change during bilateral jugular vein compression in initial position versus baseline.

All values of cc-TQ and PP obtained from 22 volunteers were included in the analysis of linear correlation (Spearman r = −0.74, p<0.001). cc-TQ – cardiac component of transillumination quotient (pial artery pulsation); PP – pulse pressure; mmHg – millimetres of mercury.