Modeling respiration from blood pressure waveform signals: an independent component approach

We describe a method for extracting the additive effect of respiration from arterial blood pressure and central venous pressure waveform signals. Our method estimates a finite impulse response (FIR) separating filter using an independent component approach, analogous to minimizing the coherence of the separated components. We compare the extracted respiration component with the impedance based respiration signal and with a respiration estimate extracted using an LMS-optimal bandpass filter of comparable order.