What This Means
This research examined six years of birth data (2018–2023) at a major referral hospital in Rio de Janeiro, Brazil, to understand how common heart defects present at birth are, what other health conditions they are associated with, and what happens to affected newborns. Out of nearly 5,700 births, about 1 in 25 newborns (4%) had some form of congenital heart disease (CHD). The most common type was a hole between the lower chambers of the heart (ventricular septal defect), and 60% of all heart defects were classified as complex. Encouragingly, over 93% of cases were detected before birth through prenatal screening, though the prenatal ultrasound of the heart (fetal echocardiogram) correctly identified the condition about 79% of the time.
A striking finding was how frequently heart defects occurred alongside other health problems. Nearly two-thirds of affected newborns also had other structural abnormalities — most often affecting the digestive system, brain and nervous system, or urinary and reproductive organs. Additionally, more than 4 in 10 newborns with CHD had a confirmed genetic syndrome, most commonly Down syndrome (trisomy 21), Edwards syndrome (trisomy 18), or Patau syndrome (trisomy 13). These genetic conditions are known to significantly affect multiple organ systems and overall survival.
This research suggests that the presence of additional congenital anomalies or genetic syndromes significantly worsens outcomes for newborns with heart defects. Babies with heart defects alone had a hospital survival rate of about 53%, while those with additional syndromes or anomalies survived to discharge only about 29% of the time. These findings highlight the importance of early prenatal detection and coordinated care from teams of specialists — including cardiologists, geneticists, and neonatologists — for families affected by congenital heart disease, particularly when other conditions are also present.