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Diagnostic algorithm for evaluation of pulmonary vascular response patterns to exercise in the setting of normal resting filling pressures. CPET indicates cardiopulmonary exercise test. ΔPAP/ΔCO indicates relative changes in pulmonary arterial pressure and cardiac output during exercise. WU indicates Wood units; TPG indicates transpulmonary gradient; PCWP indicates pulmonary capillary wedge pressure; (u) and (s) indicate upright and supine, respectively.
