II. Epidemiology
- Incidence: 2% of Congenital Heart Defects
III. Pathophysiology
- One of three types of Atrial Septal Defect
- Congenital opening in septum near AV valves
- Defect occurs during Embryonic development
- Associated with cleft mitral valve leaflet
IV. Symptoms
V. Signs
- Rounded chest
- Precordial bulge (rare)
- No Cyanosis or finger Clubbing
- Accentuated precordial Apical Thrust
- Accentuated P2 with fixed splitting on respirations
- Systolic thrill near sternal border
-
Systolic Murmur
- Harsh Systolic Murmur at left sternal border
- Apical Systolic Murmur transmitted to axilla
- Mid-Diastolic Murmur at apex
VI. Radiology: Chest XRay
- Cardiomegaly
VII. Diagnostics: Electrocardiogram (EKG)
- Incomplete Right Bundle Branch Block
VIII. References
- Saenz (1999) Am Fam Physician 59(7):1857-66 [PubMed]
- Cyran (1998) PREP review lecture, October, Phoenix
- Merenstein (1994) Pediatrics, Lange
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Related Studies
| 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 |
