Table 1.

Etiology distribution and mechanism of reported right ventricular outflow tract obstruction cases (n = 291)

	Non-congenital and non-iatrogenic(n = 174; 60%)		Congenital(n = 61;21%)		Iatrogenic(n = 56;19%)
	Intrinsic	Extrinsic	Intrinsic	Extrinsic	Intrinsic	Extrinsic
Mechanical(n = 262)	76 (43.7)	94 (54)	58 (95.1)	1 (1.6)	9 (16)	24 (42.9)
Dynamic(n = 29)	3 (1.7)	1 (0.6)	2 (3.3)	0 (0)	21(38)	2 (3.6)

Values are n (%).