The ECG shown here is from a 26 year old male whose chief complaint was mild fatigue with exertion. Physical examination revealed a grade 3/6 systolic murmur and widely split 2nd heart sound, similar to that displayed here, best heard at the left sternal border. Which of the following do you think is the most likely cause of these auscultatory findings?
- Atrial septal defect
- Ventricular septal defect
- Aortic stenosis
- Pulmonic stenosis
- Tricuspid insufficiency