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Association of the S′/RAAi ratio with survival in two independent cohorts of patients with PH. Kaplan–Meier analyses are shown for a) patients with PAH or chronic thromboembolic PH in the Giessen PH Registry (Germany) and b) patients with PAH at the University of Sapienza (Rome). PAH: pulmonary arterial hypertension; PH: pulmonary hypertension; RAAi: right atrial area indexed to body surface area; S′: lateral tricuspid annulus peak systolic velocity.
