BLOOM: Biological Legacy of Origin in Mother-Infant Dyads

Objectives and Hypotheses:

Infants born preterm and of low birth weight are known to be at increased risk for early onset of cardiovascular and renal disease in later life. This has been related to low nephron mass due to inadequate or early termination of glomerulogenesis in utero and during the perinatal period. Risks for subsequent development of hypertension and kidney disease include excessive weight gain during early life with insulin resistance and supplemental high calorie feedings.

Specific Aims The long-term goal is for early diagnosis of those infants who are at risk for future development of hypertension and kidney disease so that investigators might intervene to potentially avert progression to adult disease. The objective of this clinical trial is to acquire data on the natural history of neonatal kidney function and size in infants born preterm during the first year of life. This will be done through the use of standard serum and urine markers as well as non-invasive ultrasound technology. The central hypothesis of this clinical trial is that a subgroup of patients born preterm will demonstrate early markers of kidney injury including elevated serum cystatin C, proteinuria and hypertension. This hypothesis has been formulated on the basis of preliminary data from the group studying this question retrospectively in older children born prematurely who have developed overt kidney disease. The rationale for the proposed research is to develop early serum and demographic markers of pre-clinical kidney disease so that early intervention may occur.

Study Design. This is a single-center case-controlled prospective observational study with the rationale of evaluating parameters of renal function including proteinuria, microalbuminuria and cystatin C in preterm infants and associating this with kidney size and blood pressure during the first 10 years of life. Demographics including race, gender and growth will provide important perspectives relative to formula and/or breast feeding with/without high calorie supplements during the first year.

Part I of the Trial is enrollment from birth with collection of blood, urine and umbilical cords for histomorphometry.

Part II will be the "call-back" at 6 to 10 years of age for follow-up assessment of anthropometric and kidney growth, blood pressure and kidney function.

Inclusion criteria

Stable preterm infants <37 weeks' gestational age; Stable term infants >37 weeks' gestational age

Exclusion criteria

<24 weeks gestational age; <600 grams Any anomalies of the genital-urinary or gastrointestinal tract