Understanding the Burden of Congenital Heart Disease
Congenital Heart Disease (CHD) is one of the most common birth defects worldwide. Globally, congenital heart defects affect approximately 8 to 10 out of every 1,000 live births. In India alone, nearly 2.4 lakh children are born each year with congenital heart defects.
In the Telugu States, an estimated 20,000 children are born annually with CHDs. Therefore, protecting these fragile hearts requires stronger public awareness, early diagnosis, and timely access to specialised paediatric cardiac care. To highlight this urgent need, healthcare communities observe Congenital Heart Defects Awareness Week every year from February 7 to 14.
Causes: What We Know and What We Don’t
In nearly 85% of cases, doctors cannot identify a definitive cause for congenital heart defects. Genetic factors account for only about 10–15% of cases. However, a combination of genetic and environmental influences often contributes to abnormal heart development.
Importantly, early detection and appropriate treatment—especially within the first year of life—significantly improve survival rates and long-term health outcomes.
How Congenital Heart Defects Develop
The human heart begins forming very early in pregnancy. In fact, it starts beating and circulating blood by the 21st day after conception. The four chambers develop within four weeks, and the heart completes its structural formation by the 12th week.
Any disturbance during this critical developmental window can lead to structural abnormalities. Common congenital heart defects include:
- Holes in the heart (septal defects)
- Abnormalities in heart chambers
- Defects in major blood vessels
- Valve-related problems
Because the heart’s development is complex and rapid, even minor disruptions can have significant consequences.
Recognising the Warning Signs Early
Early recognition can save lives. Infants with septal defects often develop symptoms such as breathlessness, poor feeding, and recurrent respiratory infections like pneumonia. When abnormal openings exist between heart chambers, oxygen-rich and oxygen-poor blood mix. Consequently, excess blood flows to the lungs, causing congestion and breathing difficulties.
In certain heart defects, inadequate oxygen circulation leads to bluish discoloration of the lips, tongue, nails, and fingertips—a condition known as cyanosis.
Children with valve-related issues may appear unusually tired, lethargic, or less active. They may show little interest in play, experience sleep disturbances, or struggle with breathing.
Parents should seek medical attention if a newborn feeds poorly, breathes rapidly, appears unusually inactive, or develops bluish discoloration around the lips or nails. In such cases, doctors must perform an echocardiogram to confirm the diagnosis.
The Importance of Newborn Screening
Many developed countries routinely conduct pulse oximetry screening for newborns shortly after birth. This simple, non-invasive test measures oxygen saturation levels in the blood. Low oxygen levels may signal an underlying congenital heart defect.
Therefore, healthcare providers should ideally include pulse oximetry screening as a standard practice for all newborns to ensure early detection and timely intervention.
Key Risk Factors During Pregnancy
Although no single cause explains all cases, several risk factors increase the likelihood of congenital heart defects.
Genetic Conditions
Certain chromosomal abnormalities interfere with normal heart development. For example, Down syndrome frequently associates with congenital heart defects. Doctors can often detect such conditions during pregnancy through genetic testing.
Rubella (German Measles)
If a pregnant woman contracts rubella—especially during the first trimester when the foetal heart forms—the infection can severely disrupt heart development.
Maternal Diabetes
Women with Type 1 or Type 2 diabetes face a higher risk of delivering babies with heart defects. Moreover, poorly controlled blood sugar levels during pregnancy further elevate this risk.
Medications
Certain medications, such as lithium (used for bipolar disorder) and isotretinoin (used for severe acne), can increase the risk of congenital heart defects if taken during pregnancy.
Smoking and Alcohol
Tobacco use and alcohol consumption during pregnancy directly interfere with foetal heart development and may result in structural abnormalities.
Nutritional Deficiencies
Deficiency of essential nutrients—particularly folic acid and vitamin B12—during early pregnancy represents a significant and preventable risk factor. Adequate supplementation before and during pregnancy plays a crucial protective role.
Consanguineous Marriages
Children born to parents in consanguineous (blood-related) marriages face a higher risk of genetic disorders, including congenital heart defects. Studies suggest that 40–50 out of every 1,000 children in such families may be affected.
The Way Forward: Awareness and Early Action
Although we cannot prevent all congenital heart defects, we can treat many successfully when we diagnose them early. Public education, proper antenatal care, vaccination against rubella, good glycaemic control in diabetic mothers, nutritional supplementation, and routine newborn screening can dramatically reduce complications.
Most importantly, timely referral to specialised paediatric cardiac centres ensures that children receive appropriate medical or surgical care without delay.
Ultimately, protecting a tiny heart begins with awareness. When families, communities, and healthcare systems act early, they give every child the best possible start to life.
Dr. R. Shanthipriya
Consultant Paediatric Cardiologist
KIMS Cuddles, Visakhapatnam