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Representative measured (black) and model predicted (red) pulmonary arterial pressure waveforms for the progression of PAH (normotensive to chronic stage). From left to right: Baseline (PL, placebo), early disease stage (PAH1) and far right the chronic disease stage (PAH4). Model predictions based on the (top panel) four‐element Windkessel model (4WK) and (bottom panel) three‐element Windkessel model (3WK).
