The examined mechanical parameters include the maximum von Mises stress in the skull, pressure (mean normal stress) and maximum principal strain in the brain tissue, contact force, and head acceleration.
The experiments conducted in this study revealed that the polyurethane foams exhibited significant increase in yield stress with applied hydrostatic pressure or mean normal stress.
That means normal blood pressure, no diabetes, no cardiovascular disease, no cancer and so on.
Oops, I mean "normal" job.
Besides, the differences between using mean stress and normal pressure as an addition criterion were considered.
Furthermore, a reversed flow was reported in adult patients suffering from normal pressure hydrocephalus: mean stroke volume in the control group was 30.1 ± 19.8 μl/cycle (craniocaudal direction), while that in the NPH group it was -63.2 ± 49.0 μl/cycle (caudocranial direction) [ 156].
Finally, in terms of shape, the results from normal pressure are more complex than those from mean stress.
Sixty-three pathatts that underwent a constant pressure infusion protocol as part of their preoperative evaluation for normal pressure hydrocephalus, were included (age 70.3 ± 10.8 years (mean ± SD)).
HR, heart rate; MAP, mean arterial pressure; NaCl, normal saline (control); NTG, nitroglycerin; RAP, right atrial pressure; T0, baseline; T1, after construction of the gastric tube; T2, after pulling up the gastric tube to the neck.
