II. Epidemiology
- Ages affected: School age to adolescence
III. Signs
- Intensity: Grade I-II of VI murmur
- Soft, early to mid-Systolic Murmur at left upper sternal border (between 2nd and 3rd ribs)
- Crescendo-Decrescendo murmur
- Increased murmur in high output states
- Loudest when supine and decreased when upright or during breath holding
IV. Differential Diagnosis
- Atrial Septal Defect (ASD)
- Pulmonic stenosis
V. Course
- Innocent murmur