Figure 1: Panel A: Kaplan-Meier death free survival in 30-months long follow-up depending on pulmonary hypertension reversibility tested with nitroprusside. Panel B: Kaplan-Meier death free survival in 30-months long follow-up depending on pulmonary hypertension reversibility tested with nitric oxide. Panel C: Kaplan- Meier death free survival in 30-months long follow-up depending on pulmonary hypertension reversibility tested with sildenafil. Panel D: Kaplan-Meier death free survival in 30-months long follow-up depending on pulmonary hypertension reversibility tested with sildenafil and repeat inhalation of nitric oxide.