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[ABSTRACT] Reassessing vasoreactivity in patients with pulmonary arterial hypertension (PAH) over time shows both loss as well as gain in vasoreactivity. Am. J. Respir. Crit. Care Med. Spiekerkoetter E, Hsi A, De Jesus Perez V, Liu J, Saito S, Kudelko K, Zamanian RT 2011; 183: A5747