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Author Spotlight: Effect of Left Atrial Ligation on Avian Embryonic Hearts and HLHS Implications
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The Left Ventricular Myocardium in Hypoplastic Left Heart Syndrome

Bill Chaudhry1, Ahlam Alqahtani1, Lorraine Eley1

  • 1Bioscience Institute, Faculty of Medicine, Newcastle University, International Centre for Life, Newcastle upon Tyne NE1 3BZ, UK.

Journal of Cardiovascular Development and Disease
|August 25, 2022
PubMed

Insights

Hypoplastic left heart syndrome (HLHS) is a severe congenital heart defect. Histological studies show distinct cardiomyocyte appearances across HLHS subgroups, suggesting morphology-based classification is valuable for understanding etiology.

Area of Science:

  • Cardiology
  • Developmental Biology
  • Pathology

Background:

  • Hypoplastic left heart syndrome (HLHS) encompasses severe congenital cardiac malformations affecting the left ventricle, valves, and aorta.
  • Current clinical sub-categorization of HLHS focuses on valve patency, but left ventricular morphology offers an alternative classification framework.

Purpose of the Study:

  • To evaluate published human-based studies on the ventricular myocardium in HLHS.
  • To assess the consistency of evidence with a left ventricular morphology-based sub-categorization concept for HLHS.
  • To discuss histological findings, including endocardial fibroelastosis (EFE), and suggest future research directions.

Main Methods:

  • Review of published human-based histological studies of the ventricular myocardium in HLHS.
  • Analysis of cardiomyocyte appearance in relation to HLHS subgroups.
  • Discussion of histological features of endocardial fibroelastosis (EFE) in HLHS.

Main Results:

  • Histological studies indicate variations in cardiomyocyte appearance among different HLHS subgroups.
  • Endocardial fibroelastosis (EFE) is a common feature in a specific HLHS subgroup.

Conclusions:

  • The ventricular morphology concept provides a viable framework for sub-categorizing HLHS.
  • Histological differences in cardiomyocytes support morphology-based classification.
  • Further investigation of early-stage HLHS myocardial tissues is recommended to elucidate biological pathways and etiology.

Keywords:
aortic atresiaaortic stenosisendocardial fibroelastosismitral atresiamitral stenosismyocyte disarraypeach-like ventriclesenescenceslit-like ventricle

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