II. Epidemiology

III. Pathophysiology

  1. One of three types of Atrial Septal Defect
  2. Congenital opening in septum near AV valves
  3. Defect occurs during Embryonic development
  4. Associated with cleft mitral valve leaflet

IV. Symptoms

V. Signs

  1. Rounded chest
  2. Precordial bulge (rare)
  3. No Cyanosis or finger Clubbing
  4. Accentuated precordial Apical Thrust
  5. Accentuated P2 with fixed splitting on respirations
  6. Systolic thrill near sternal border
  7. Systolic Murmur
    1. Harsh Systolic Murmur at left sternal border
    2. Apical Systolic Murmur transmitted to axilla
      1. Mitral Regurgitation
  8. Mid-Diastolic Murmur at apex

VI. Radiology: Chest XRay

  1. Cardiomegaly

VII. Diagnostics: Electrocardiogram (EKG)

VIII. References

  1. Saenz (1999) Am Fam Physician 59(7):1857-66 [PubMed]
  2. Cyran (1998) PREP review lecture, October, Phoenix
  3. Merenstein (1994) Pediatrics, Lange

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Ontology: Structure of ostium primum (C0225839)

Concepts Body Part, Organ, or Organ Component (T023)
SnomedCT 86023005
English ostium primum, Ostium primum, Structure of ostium primum (body structure), Structure of ostium primum
Spanish estructura del ostium primum (estructura corporal), estructura del ostium primum, ostium primum