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42 Specific Conditions Figure 4. Closure Considerations for Patent Ductus Arteriosus PVR >2 to <5 WU PVR ≤2 WU PDA with hemodynamically significant shunt 1 PDA closure 2a PDA closure 1 Evaluate for PAH 2a Test occlusion PAH indicates pulmonary arterial hypertension; PDA, patent ductus arteriosus; PVR, pulmonary vascular resistance; and WU, Wood units.
