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A case of complete situs inversus
M João Marta1, L Menezes Falcão, J A Saavedra
1Serviço de Medicina I, Hospital de Santa Maria, Lisboa.
Summary
Complete situs inversus, a rare condition affecting 1/10,000 births, involves reversed organ placement. This case highlights its association with atrial septal defects, showing a normal life expectancy when managed correctly.
Area of Science:
- Developmental biology
- Genetics
- Cardiology
Background:
- Complete situs inversus is a rare congenital condition with an estimated frequency of 1 in 10,000 births.
- It arises from abnormal embryonic cardiac tube rotation, with the underlying mechanism often unknown.
- Genetic factors involving genes like lefty, nodal, and ZIC3 are implicated in left-right asymmetry defects.
Observation:
- Dextrocardia with situs inversus typically presents with a structurally normal heart in 90-95% of cases.
- Atrial septal defects are common congenital cardiac anomalies in adults.
- A case of a 64-year-old man with complete situs inversus and an ostium secundum atrial septal defect is presented.
Findings:
- Diagnosis of situs inversus is established through clinical findings and imaging like radiography and electrocardiography.
- The patient presented with embolic stroke secondary to atrial fibrillation.
- Complete situs inversus was identified alongside a corrected ostium secundum atrial septal defect.
Implications:
- Unlike dextroversion, dextrocardia with situs inversus generally has a normal life expectancy.
- Understanding the genetic basis of situs inversus aids in diagnosing and managing associated cardiac anomalies.
- Advances in DNA analysis continue to illuminate the genetic underpinnings of these developmental abnormalities.