Does extreme prematurity affect kidney volume at term corrected age?

Abstract

Objective. Extreme prematurity exposes the neonate to a number of potential renal insults that may result in a reduced number of glomeruli and/or renal size. This may predispose these individuals to cardiovascular disease later in life. The objective was to determine using magnetic resonance imaging (MRI) whether extreme prematurity results in decreased renal volume.

Methods. Neonates <29 weeks' gestation and term infants undergoing MRI of the brain were enrolled in the study. An MRI was performed at term corrected age in the premature neonate and within the first 4 weeks of life in the term neonate.

Results. Seventeen preterm infants and 13 term infants had MRIs performed. There was no significant difference in weight and length at the time of MRI (p = 0.76 and 0.11, respectively). There was no significant difference in total renal volume or total kidney volume to weight ratio between the preterm and term neonates (p = 0.83 and 0.6, respectively).

Conclusions. At term corrected age, extremely premature neonates have the same renal volume as term infants. It is unclear whether renal volume is a good indicator of glomerular number.

Keywords:

• MRI
• extreme prematurity
• renal volume
• birth weight
• neonate