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Related Experiment Video

Updated: Jul 15, 2026

Left Atrial Ligation in the Avian Embryo as a Model for Altered Hemodynamic Loading During Early Vascular Development

Left Atrial Ligation in the Avian Embryo as a Model for Altered Hemodynamic Loading During Early Vascular Development

Published on: June 16, 2023

Hypoplastic left heart syndrome.

Jean Anne Connor¹, Ravi Thiagarajan

¹Cardiovascular Program, Children's Hospital Boston, USA. Jean.Connor@CARDIO.CHBOSTON.ORG

Orphanet Journal of Rare Diseases

|May 15, 2007

Summary

Hypoplastic left heart syndrome (HLHS) is a severe congenital heart defect affecting left-sided structures. Early diagnosis via echocardiography and surgical intervention are crucial for managing this duct-dependent condition.

Area of Science:

Pediatric Cardiology
Congenital Heart Defects
Neonatal Health

Background:

Hypoplastic left heart syndrome (HLHS) involves abnormal development of left-sided cardiac structures.
This leads to outflow obstruction, underdeveloped left ventricle, aorta, and mitral valve issues.
HLHS affects 0.016-0.036% of live births, with infants initially appearing healthy.

Purpose of the Study:

To provide an overview of Hypoplastic Left Heart Syndrome.
To discuss diagnostic modalities and differential diagnoses.
To outline current treatment strategies and challenges.

Main Methods:

Diagnosis relies heavily on echocardiography, including fetal echocardiography between 18-22 weeks.
Differential diagnosis considers other left-sided obstructive lesions dependent on ductal flow.

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Isolation of Endocardial and Coronary Endothelial Cells from the Ventricular Free Wall of the Rat Heart

Isolation of Endocardial and Coronary Endothelial Cells from the Ventricular Free Wall of the Rat Heart

Published on: April 15, 2020

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Last Updated: Jul 15, 2026

Left Atrial Ligation in the Avian Embryo as a Model for Altered Hemodynamic Loading During Early Vascular Development

Left Atrial Ligation in the Avian Embryo as a Model for Altered Hemodynamic Loading During Early Vascular Development

Published on: June 16, 2023

Isolation of Endocardial and Coronary Endothelial Cells from the Ventricular Free Wall of the Rat Heart

Isolation of Endocardial and Coronary Endothelial Cells from the Ventricular Free Wall of the Rat Heart

Published on: April 15, 2020

Information is synthesized from existing medical literature and clinical practice.

Main Results:

Newborns with HLHS present with duct-dependent systemic circulation, leading to hypoxemia and shock as the ductus arteriosus closes.
Diagnosis is often made via echocardiogram, with fetal diagnosis possible.
Treatment involves either primary cardiac transplantation or staged univentricular palliation.

Conclusions:

HLHS requires immediate neonatal surgical intervention due to duct-dependent circulation.
While surgical survival has improved, significant mortality and morbidity persist.
Limited long-term survival and quality of life data present ongoing challenges for clinicians and families.