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  • Invasive ICP’s percussion wave (A1) timing (T1) is almost the corresponding ABP’s waveform first peak 

  • Invasive ICP’s notch (A3) timing (T3) is closely related to ABP’s dicrotic notch

  • Invasive ICP’s tidal wave (A2) timing (T2) is estimated to be midway between ABP’s T3 and T1

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Based on this observation an algorithm was developed that estimates P1 and P2 amplitudes for the invasive ICP waveform, as well as the BcSs-PICNI-2000 (B4C Sensor) waveforms, based on the concurrent ABP pulse’s T1 and T2 normalized timings (Figure 07). This allowed for indirect (surrogate) P1 and P2 estimation when they are not visually identifiable in the invasive ICP.

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