Figure 1From: Changes in healthcare utilization and costs associated with sildenafil therapy for pulmonary arterial hypertension: a retrospective cohort study Use of PAH-related pharmacotherapy during pre- and post-index periods. *Excluding sildenafil. PDE-5: Phosphodiesterase type-5 inhibitor; PG/PGI2: Prostaglandin/prostacyclin analogues; ETRA: Endothelin-receptor antagonist; CCB: Calcium-channel blocker; AC: Anticoagulant.Back to article page