ASD is an opening in interatrial septum causing left-to-right shunt. Accounts for 6-10% of congenital heart disease cases. Can be classified as ostium secundum, sinus venosus, or ostium primum
Atrial flutter is a rapid heart rhythm occurring in the atria. Heart beats at 242-360 bpm, appearing as sawtooth P waves on ECG. Second most common tachyarrhythmia after atrial fibrillation
A common abnormal heart rhythm caused by abnormal electrical circuit in atria. Causes rapid, fluttering heartbeats instead of full squeezing. Can lead to stroke risk and reduced heart function
ASD is second most common congenital heart defect after VSD. Accounts for 10% of congenital heart disease, more common in women. Diagnosis often delayed until adulthood due to complications
RBBB occurs when electrical impulse is delayed or not conducted along right bundle branch. Heart's conduction system develops from specialized tissue rings in embryonic heart tube. AV node lies anterior to coronary sinus, blood supply from right coronary artery. Right bundle branch originates from right ventricular septum, left bundle branch from left ventricle
CHD is a birth defect affecting heart structure present at birth. Occurs in 1% of live births globally, affecting 4-75 per 1,000 births. Leading cause of birth defect-related deaths, down from 366,000 in 1990