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Figure 1 | BioMedical Engineering OnLine

Figure 1

From: Baseline pressure errors (BPEs) extensively influence intracranial pressure scores: results of a prospective observational study

Figure 1

Simultaneous 6-sec time windows of signals 1 and 2. An example of a 6-sec time window showing the signal of (a) ICP Signal 1 and (b) ICP Signal 2. The 6-sec time window contains seven cardiac-induced ICP waves; the amplitude (dP), rise time (dT) and rise time coefficient (dP/dT) were automatically determined for each wave (c). The mean ICP (horizontal lines) and mean ICP wave amplitude (MWA) were determined for every consecutive 6-sec time window. For the 6-sec time window shown in a-b, the values were as follows: (a) Signal 1: Mean ICPSignal 1 9.0 mmHg, MWASignal 1 4.3 mmHg, MWRTSignal 2 0.23 sec, and MWRTCSignal 2 24.1 mmHg/sec. (b) Signal 2: Mean ICPSignal 2 0.3 mmHg, MWASignal 2 4.3 mmHg, MWRTSignal 2 0.24 sec, and MWRTCSignal 2 24.2 mmHg/sec. For this particular 6-sec time window, the BPE was represented by a difference in mean ICP of 8.7 mmHg, despite close to identical waveform, represented by difference in MWA of 0.05 mmHg, difference in MWRT of 0.003 sec, and difference in MWRTC of 0.14 mmHg/sec.

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