Association Between ICP Pulse Waveform Morphology and ICP B Waves
The study aimed to investigate changes in the shape of ICP pulses associated with different patterns of the ICP slow waves (0.5–2.0 cycles/min) during ICP overnight monitoring in hydrocephalus. Four patterns of ICP slow waves were characterized in 44 overnight ICP recordings (no waves – NW, slow symmetrical waves – SW, slow asymmetrical waves – AS, slow waves with plateau phase – PW). The morphological clustering and analysis of ICP pulse (MOCAIP) algorithm was utilized to calculate a set of metrics describing ICP pulse morphology based on the location of three sub-peaks in an ICP pulse: systolic peak (P1), tidal peak (P2) and dicrotic peak (P3). Step-wise discriminant analysis was applied to select the most characteristic morphological features to distinguish between different ICP slow waves. Based on relative changes in variability of amplitudes of P2 and P3 we were able to distinguish between the combined groups NW + SW and AS + PW (p < 0.000001). The AS pattern can be differentiated from PW based on respective changes in the mean curvature of P2 and P3 (p < 0.000001); however, none of the MOCAIP feature separates between NW and SW. The investigation of ICP pulse morphology associated with different ICP B waves may provide additional information for analysing recordings of overnight ICP.
KeywordsIntracranial pressure Waveform analysis Hydrocephalus
The present work is partially supported by NINDS R21 awards NS055998, NS055045 and NS059797 and R01 awards NS054881 and NS066008. MK is supported by the Foundation for Polish Science.
Conflict of interest statement
We declare that we have no conflict of interest.