- Note the O2 sat in the SVC, as soon as it reaches the RA it is high- This can only be due to a left to right shunt- an ASD
- Atrial septal defect (ASD) is the most prevalent congenital cardiac anomaly in adults, accounting for ~35% of all congenital heart defects. Late presentation is due to the insidious development of right ventricular remodeling, with enlargement of right cardiac chambers.
- With advancing age, symptoms such as exercise intolerance, dyspnea, fatigue, and atrial arrhythmias (with or without palpitations) become more common; 90% of untreated patients experience these symptoms, or may show evidence of heart failure, by the age of 40 years
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