Skip to main content
. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Physiol Meas. 2012 Nov 15;33(12):2017–2031. doi: 10.1088/0967-3334/33/12/2017

Figure 1.

Figure 1

An illustration of the theoretical underpin of the proposed intracranial pressure (ICP) dynamic system steady state detection approach. Panel A displays a single pressure volume curve as a first-order approximation for an ICP dynamic system in a steady state. Points A and B on this curve have different mean ICP and hence different ICP pulse waveform amplitude and morphology. However, pulse amplitude and waveform morphology will be the same for a given mean ICP. In other words, individual pulses move along this curve as mean ICP oscillates in the form of B waves etc. Panel B shows an ICP dynamic system undergoing acute changes such that the system follows different pressure volume curves at different time points so that the pulses with same mean ICP will likely have different amplitude and waveform morphology because the system now jumps between different pressure volume curves. Therefore, a manifestation of the ICP dynamic system at steady state is that the ICP pulses at similar mean ICP resemble each other.