Final answer:
Atypical right-sided atrial flutter may originate from the endocardium of the interventricular septum in the right ventricle. It is typically related to septal or valve defects, resulting in an unusual heart sound detected by auscultation.
Step-by-step explanation:
Atypical right-sided atrial flutter may originate from the This condition is typically related to septal or valve defects, which can cause an unusual heart sound detected by auscultation. The electrical signals from the conductile fibers in this region can lead to abnormal contraction of the heart.