How do I know if I have Hypoplastic Left Heart Syndrome?

Hypoplastic Left Heart Syndrome (HLHS) is a rare, life-threatening congenital heart defect typically diagnosed during pregnancy or shortly after birth, characterized by the underdevelopment of the left side of the heart. Because Hypoplastic Left Heart Syndrome requires immediate surgical intervention in the neonatal period, it is rarely a condition discovered for the first time in adulthood; if you suspect heart issues, you should seek immediate evaluation by a cardiologist.

What are the early signs of Hypoplastic Left Heart Syndrome?

In newborns, Hypoplastic Left Heart Syndrome presents with severe symptoms as the ductus arteriosus closes. These include rapid or difficult breathing, a grayish-blue skin tint (cyanosis), poor feeding, and cold hands and feet. In the rare event of a milder, undiagnosed form, an individual might experience persistent fatigue, shortness of breath during exertion, or signs of heart failure that would require a comprehensive cardiac evaluation.

How is Hypoplastic Left Heart Syndrome diagnosed?

Diagnosis of Hypoplastic Left Heart Syndrome is most frequently achieved through a fetal echocardiogram during pregnancy. If not detected prenatally, it is diagnosed in the nursery using the following methods:

• Pulse oximetry: A non-invasive test measuring oxygen saturation levels in the blood.


• Echocardiogram: The gold standard imaging test that uses ultrasound to visualize the structure and function of the heart.


• Physical Examination: Assessment for heart murmurs, weak pulses, and respiratory distress.

When should I seek urgent medical care?

If you or a loved one experiences sudden chest pain, fainting, severe shortness of breath, or a sudden change in skin color, seek emergency medical services immediately. While these symptoms are not exclusive to Hypoplastic Left Heart Syndrome, they are red flags for various congenital or structural heart conditions that require urgent diagnostic imaging.

How do I advocate for my heart health?

If you have concerns about your cardiac function, specifically regarding Hypoplastic Left Heart Syndrome, prepare a detailed history of your symptoms. Ask your primary care provider for a referral to a pediatric or adult congenital heart disease (ACHD) specialist. If your concerns are dismissed, request a referral for an echocardiogram specifically to rule out structural anomalies.

Next steps

• Consult with a board-certified cardiologist to discuss your symptoms and family history.


• Request an echocardiogram if you suspect structural heart concerns.


• Connect with the 28 members of the DiseaseMaps.org community who are living with or managing Hypoplastic Left Heart Syndrome.


• Explore resources from the American Heart Association regarding congenital heart defects.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the guidance of your physician with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD) - Hypoplastic Left Heart Syndrome


• Orphanet: Hypoplastic Left Heart Syndrome


• OMIM (Online Mendelian Inheritance in Man) - Hypoplastic Left Heart Syndrome


• American Heart Association: Congenital Heart Defects