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Schematic diagram of type Ib or Ic and type II tricuspid valve atresia

Schematic diagram of type Ib or Ic and type II tricuspid valve atresia
Schematic diagram demonstrating the anatomical and physiologic features of TV atresia type Ib or Ic (normally related great arteries and VSD) and TV atresia type IIc (D-transposition of the great arteries with no pulmonary stenosis). TV atresia with normally related great arteries and no VSD is classified as type Ia. In all types of TV atresia, the obligate atrial level shunt results in mixing of systemic and pulmonary venous blood in the LA. In types Ib and Ic, there is a left-to-right shunting at the level of the VSD, which serves as the source of pulmonary blood. In type II, the VSD is critical for systemic output as the RV, which provides the systemic circulation through the Ao, is dependent on blood flowing from the LV through the VSD. In TV atresia type II, blood flow to the PA is derived directly from the LV.
Ao: aorta; PA: pulmonary artery; RA: right atrium; LA: left atrium; RV: right ventricle; LV: left ventricle; TV: tricuspid valve; VSD: ventricular septal defect.
Graphic 88605 Version 2.0

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