Arterial Inversion

 

 

                                                   

  http://www.childrenheartinstitute.org/educate/defects/transpo1.htm

 

                                 Normal                                                                                                                 Transposed Arteries

 

Deoxygenated (blue) blood                   Body                                                        Deoxygenated (blue) blood

                                                                                                                                                                

Right atrium                                           Aorta                                                  Right atrium                             Body

                                                                                                           

Right ventricle                                     Left ventricle                                       Right Ventricle              Aorta

                                                           

Pulmonary artery                                 Left atrium                                                                                                  Oxygenated (red) blood

                                                                                                                                                                                  

        Lungs                          Oxygenated (red) blood                                                                                    Left Atrium          Body

                                                                                                                                                                                                    

                                                                                                                                                                      Left Ventricle               Pulmonary Artery

 

The resulting parallel loops prevent oxygenated blood from ever

getting to the body, and deoxygenated blood from ever getting to the lungs.

 

What enables survival is any mixing of blood in heart, which allows some oxygenated

blood to reach the body and some deoxygenated blood to reach the lungs.

 

Associated Defects  which allow mixing of ox and deox blood

• Foramen Ovale – hole between atria in foetal heart is forced to stay open, allowing blood to mix
• Ductus Arteriosis – vessel connecting pulmonary artery and aorta in foetal heart is forced to stay open
• Ventricular or Atrial Septal Defect – hole in septum can lead to 80% saturation of blood

 

           http://www.kumc.edu/kumcpeds/

       

        D-Transposition with Atrial Septal Defect         purple = mixed blood