in which type of Atrial septal defect (ASD) the lower part of atrial septum is involved?
A) Septum secundum
B) Sinus venosus
C) Septum primum
D) Lutembacher syndrome
Schemating drawing showing the location of different types of ASD, the view is into an opened right atrium. HV: right ventricle; VCS: superior caval vein; VCI: inferior caval vein; 1: upper sinus venosus defect; 2: lower sinus venosus defect; 3: secundum defect; 4: defect involving coronary sinus; 5; primum defect.
Sinus venosus affects the upper part of the septum near the entrance of the superior vena cava.
Septum primum affects lower part of septum
Septum secundum involves the fossa ovalis
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