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Human Laterality Disorders: Pathogenesis, Clinical Manifestations, Diagnosis, and Management.

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Human laterality disorders involve abnormal organ positioning. Heterotaxy, a key disorder, presents with complex congenital anomalies, but innovative therapies improve patient outcomes.

Keywords:
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Area of Science:

  • Developmental Biology
  • Human Genetics
  • Medical Science

Background:

  • Human laterality disorders are characterized by abnormal left-right axis positioning of thoraco-abdominal organs and vessels.
  • Situs inversus totalis involves a complete mirror-image reversal, while situs ambiguus (heterotaxy) features abnormal arrangements excluding situs inversus totalis.
  • Heterotaxy, also known as atrial isomerism, involves abnormal organ location and loss of asymmetry, often associated with severe congenital anomalies.

Purpose of the Study:

  • To define human laterality disorders, including situs inversus totalis and heterotaxy.
  • To describe the spectrum of anomalies associated with heterotaxy, affecting cardiac, vascular, pulmonary, and intra-abdominal organs.
  • To highlight the impact of innovative surgical therapies on the prognosis of heterotaxy.

Main Methods:

  • Review of literature on human laterality disorders.
  • Classification of disorders based on organ positioning and asymmetry.
  • Analysis of associated anomalies and treatment outcomes.

Main Results:

  • Laterality disorders encompass situs inversus totalis and heterotaxy (situs ambiguus).
  • Heterotaxy is linked to complex congenital heart and vascular anomalies, as well as abnormalities in lungs, spleen, liver, gallbladder, and intestines.
  • Many heterotaxy-associated anomalies are life-threatening if untreated.

Conclusions:

  • Heterotaxy and related isomerism can lead to severe, often lethal, congenital conditions.
  • Innovative surgical interventions have significantly reduced mortality and improved long-term prognoses for patients with heterotaxy.
  • Understanding laterality disorders is crucial for diagnosing and managing complex congenital anomalies.