EIT-based non-invasive measurements correlate with pulmonary arterial pressure in patients

Abstract Objective. To investigate the relationship between cardiac synchronized timing of electrical impedance tomography (EIT) signals and invasively measured mean pulmonary artery pressure (mPAP) in patients with cardiovascular disease. Approach. EIT, ECG and mPAP were recorded in seven patients as part of routine surgery during an apnoea phase, while pressure changes were induced with phenylephrine. Four waveform timings were considered: the maximum, the maxima of the first and second derivatives, and the tangent intersection. Their delays from ECG R waves defined eight markers across the

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