**2. Etiology of pulmonary valve disease**

	- Primary
		- Pulmonary stenosis
		- Pulmonary atresia
	- Secondary to surgical treatment of congenital lesions
		- Pulmonary regurgitation after tetralogy of Fallot repair
		- Homograft dysfunctions:
			- Following Ross procedure
			- Homografts used for reconstruction of the right ventricular outflow tract (RVOT):
				- Pulmonary atresia
				- Complex forms of tetralogy of Fallot
				- Truncus arteriosus

	- Carcinoid heart disease
	- Endocarditis
	- Pulmonary artery aneurysms
	- Tumors
	- Rheumatic heart disease
