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Emergency department visits in IPAH and POPH. Least square means for emergency department visits in IPAH and POPH after adjustment for age, functional class, 6-min walk distance, cardiac index, right atrial pressure, and education level. Compared with IPAH, patients with POPH had a higher number of emergency department visits in the six months preceding enrollment in the Pulmonary Hypertension Association Registry (1.5, 95% CI: 1.2–1.9 visits vs. 0.8, 95% CI: 0.7–1.0 visits, p = 0.001).
