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Introduction <p>Near infrared spectroscopy (NIRS) monitoring of preterm kidney oxygenation is increasing. We sought to evaluate kidney positioning and oxygenation differences between the right and left kidneys.</p> Methods <p>Preterm neonates &lt;32 weeks’ gestational age were enrolled in a prospective observational NIRS study. Two three-hour epochs of simultaneous bilateral kidney monitoring were performed (5–8 days, 9–14 days). Point of care kidney ultrasound was performed once between days 5 and 12.</p> Results <p>There were no right-left differences in skin to superior kidney depth (0.39 and 0.38 cm; <i>p</i> = 0.62) or spine to kidney distance (1.06 and 1.02 cm; <i>p</i> = 0.31). There was a difference in right-left skin to inferior kidney depth (2.15 and 2.04 cm; <i>p</i> = 0.02). There was higher oxygenation in the left kidney compared to the right (65.6 vs. 62.7%, <i>p</i> &lt; 0.01). Hourly individual differences of &gt;10% were seen in 37% of neonates.</p> Conclusions <p>Differences in kidney depth and right-left oxygenation exist in preterm neonates.</p>

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Evaluation of kidney oxygenation monitoring with near infrared spectroscopy in preterm neonates: kidney location, depth, and laterality differences

  • 期刊论文

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  • 发表日期：

    2025年7月19日

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  • Matthew W. Harer,
  • Kate Walker,
  • Lauren Gadek,
  • Shayla Schwingle,
  • Cassandra Nelson,
  • Meg Baker,
  • Elena Alfaro,
  • Adam S. Bauer,
  • Paige Condit

摘要

Introduction

Near infrared spectroscopy (NIRS) monitoring of preterm kidney oxygenation is increasing. We sought to evaluate kidney positioning and oxygenation differences between the right and left kidneys.

Methods

Preterm neonates <32 weeks’ gestational age were enrolled in a prospective observational NIRS study. Two three-hour epochs of simultaneous bilateral kidney monitoring were performed (5–8 days, 9–14 days). Point of care kidney ultrasound was performed once between days 5 and 12.

Results

There were no right-left differences in skin to superior kidney depth (0.39 and 0.38 cm; p = 0.62) or spine to kidney distance (1.06 and 1.02 cm; p = 0.31). There was a difference in right-left skin to inferior kidney depth (2.15 and 2.04 cm; p = 0.02). There was higher oxygenation in the left kidney compared to the right (65.6 vs. 62.7%, p < 0.01). Hourly individual differences of >10% were seen in 37% of neonates.

Conclusions

Differences in kidney depth and right-left oxygenation exist in preterm neonates.