II. Epidemiology

  1. Ages affected: School age to adolescence

III. Signs

  1. Intensity: Grade I-II of VI murmur
  2. Soft, early to mid-Systolic Murmur at left upper sternal border (between 2nd and 3rd ribs)
  3. Crescendo-Decrescendo murmur
  4. Increased murmur in high output states
  5. Loudest when supine and decreased when upright or during breath holding

IV. Differential Diagnosis

  1. Atrial Septal Defect (ASD)
  2. Pulmonic stenosis

V. Course

  1. Innocent murmur

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