1.The indications for arteriovenous catheterization Weight > 8 kg, various types of arteriovenous catheterization, with clinical symptoms and cardiac overload performance, not combined with other cardiac malformations requiring surgery. 2, relative indications A, weight 4-8 kg, with clinical symptoms and cardiac overload, not combined with other cardiac malformations requiring surgery; B, catheter diameter > 14 mm; C, combined with endocarditis, but has been controlled for 3 months; D, combined with mild mitral valve insufficiency, mild to moderate aortic valve stenosis and insufficiency. 3, Contraindications A, infective endocarditis with redundant heart valves and catheters; B, severe pulmonary hypertension with right-to-left shunt and pulmonary resistance >14wood units; C, combined malformations requiring surgical correction; D, patients dependent on unclosed arterial catheters for survival; E, patients with other combined diseases not suitable for surgery and intervention.