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Table 2 Indications for the treatment of peripheral pulmonary artery stenosis [7, 9]

From: The treatment dilemma in adult patients with peripheral pulmonary artery stenosis of diverse etiologies

• A reduction in the vessel diameter of greater than 40% or a reduction in the vessel diameter of greater than 30% in cases with additional right ventricular volume overload (e.g., atrial septal defect, tricuspid regurgitation, and pulmonary regurgitation)
• After cavo-pulmonary anastomoses (the Glenn or Fontan shunt), pulmonary artery stenosis should be considered for therapy even if the reduction in the vessel diameter is less than 30%.
• Bilateral pulmonary artery stenosis resulting in a right ventricular systolic pressure of more than 50% of the systemic pressure
• Significant stenosis with a measurable gradient of greater than 20 mmHg (30 mmHg)
• Pulmonary artery branch stenosis resulting in a reduction in an ipsilateral lung perfusion level of less than 20% (30%)
• Hypertension in other unobstructed pulmonary artery segments