Meconium and Transitional Stools May Cause Interference with Near-Infrared Spectroscopy Measurements of Intestinal Oxygen Saturation in Preterm Infants

  • Alecia Thompson
  • Paul Benni
  • Sara Seyhan
  • Richard Ehrenkranz
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 765)

Abstract

In a pilot study, we found that the NIRS measurements were highly variable and dramatically decreased or disappeared sporadically while monitoring gastro-intestinal (GI) StO2 on preterm neonates. We hypothesized that the light absorption characteristics of different neonatal and infant stool types may be interfering with NIRS GI measurements. Methods: Meconium, transitional, and mature stool samples collected from preterm neonates and older infants (ranging from a few days to weeks in age) were analyzed by a bench-top spectrometer to measure light absorbance in the near infrared range (650–950 nm). Results: Some meconium and transitional stool samples were noted to have a more marked increase in light absorbance as wavelength decreases towards 650 nm, when compared to more mature stools. When compared to the light absorbance spectra of deoxy-hemoglobin (Hb) and oxy-hemoglobin (HbO2), there is a high potential that Hb and HbO2 may be erroneously calculated, resulting in falsely low GI StO2. Discussion: Meconium and green colored transitional stools demonstrate a light absorbance spectra that may interfere with NIRS GI measurements, possibly due to their higher biliverdin content, which exhibits a broad spectral absorption peak at 660 nm. Caution is warranted in interpreting GI StO2 NIRS results in neonates still passing meconium and transitional stools until NIRS-based tissue oximeters to measure GI StO2 can compensate for the presence of these stool types.

Keywords

Meconium Stools Near-infrared spectroscopy StO2 Intestine 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Alecia Thompson
    • 1
  • Paul Benni
    • 2
  • Sara Seyhan
    • 2
  • Richard Ehrenkranz
    • 3
  1. 1.Division of NeonatologyChildren’s Hospital at Montefiore, Albert Einstein College of MedicineBronxUSA
  2. 2.CAS Medical Systems, IncBranfordUSA
  3. 3.Division of Newborn MedicineYale New Haven HospitalNew HavenUSA

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