Hyperalphalipoproteinemia, birth to age to years

Area of Science:

• Pediatric lipidology
• Cardiovascular disease risk factors
• Neonatal health

Background:

• High-density lipoprotein cholesterol (HDL-C) is crucial for reverse cholesterol transport and cardiovascular health.
• Understanding the early life determinants and tracking of HDL-C is important for predicting long-term cardiovascular risk.
• Hyperalphalipoproteinemia in neonates may indicate a predisposition to persistently elevated HDL-C.

Purpose of the Study:

• To assess the interrelationships of cord blood HDL-C with other plasma lipids (total cholesterol, triglycerides, LDL-C).
• To evaluate the longitudinal tracking of HDL-C rank order from birth to 2 years in hypercholesterolemic neonates.
• To focus on hyperalphalipoproteinemic neonates to determine the persistence of elevated HDL-C.

Main Methods:

• Analysis of cord blood lipid profiles in 76 hypercholesterolemic neonates (TC > 95 mg/dl).
• Focus on 34 neonates with hyperalphalipoproteinemia (cord blood HDL-C > 61 mg/dl, ≥ 99th percentile).
• Longitudinal assessment of HDL-C levels at 6, 12, and 18-24 months, correlating with birth values and other lipids.

Main Results:

• Cord blood HDL-C showed significant correlations with HDL-C at 6, 12, and 18-24 months (r=0.32-0.49).
• Elevated HDL-C in the highest quartile at birth showed significant tracking into early childhood (38-60% retained highest quartile).
• Infants with very high cord blood HDL-C often maintained levels above the 90th percentile throughout follow-up.

Conclusions:

• Neonates with high cord blood HDL-C, particularly those with hyperalphalipoproteinemia, tend to maintain elevated HDL-C levels into early childhood.
• Persistent elevation of HDL-C may offer a protective effect against coronary heart disease later in life.
• Early identification of high HDL-C in infancy could inform future cardiovascular risk assessment.