Figure 10.

Brain pulse class changes associated with hypotension and an acute fall in cerebral arteriole pressure over 6 minutes in a brain injured patient. Panel (A) Patient with large volume right middle cerebral artery stroke with raised intracranial pressure evidenced by midline shift to the left on computerized tomography (CT). Panel (B) demonstrates low compliance brain pulse over both hemispheres associated with high systolic blood pressure (BP) of 200 mmHg. Panel (C) Systolic BP dropped to 90mmHg. Both hemispheres’ brain pulses have developed Hybrid brain pulse features with delayed pulse peak of 660 nm compared with 940 nm and other differences in the respective pulse shapes. Panel (D) Systolic BP falls further to 55 mmHg. The left brain has Hybrid brain pulse features and the right now has Weak brain pulse features. Red brain pulse is 940 nm and blue brain pulse 660 nm. (R) Right. (L) Left.