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Peripheral oxygenation in hypotensive preterm babies.

S P Wardle1, C W Yoxall, A M Weindling

  • 1Neonatal Unit, Liverpool Women's Hospital, United Kingdom.

Pediatric Research
|March 24, 1999
PubMed
Summary
This summary is machine-generated.

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Hypotensive preterm infants show reduced oxygen delivery and consumption in forearm tissues. Treatment improved these parameters, indicating peripheral tissue oxygenation monitoring is valuable for understanding hypotension in neonates.

Area of Science:

  • Neonatology
  • Physiology
  • Biomedical Engineering

Background:

  • Monitoring peripheral tissue oxygenation in preterm infants is crucial for understanding blood flow redistribution during hypotension.
  • Near-infrared spectroscopy (NIRS) with venous occlusion allows measurement of hemoglobin flow and venous saturation.

Purpose of the Study:

  • To investigate peripheral tissue oxygenation parameters in hypotensive versus normotensive preterm infants.
  • To assess the impact of hypotension treatment on oxygen delivery, consumption, and fractional extraction in preterm neonates.

Main Methods:

  • Near-infrared spectroscopy (NIRS) was used to measure forearm hemoglobin flow and venous saturation in 30 ventilated preterm infants.
  • Calculations included fractional oxygen extraction, oxygen delivery (DO2), and oxygen consumption (VO2).

Related Experiment Videos

  • Infants were categorized as hypotensive (n=15) or normotensive (n=15), with hypotensive infants receiving dopamine, albumin with dopamine, or blood transfusion.

    • Main Results:

    • Hypotensive infants had significantly lower forearm hemoglobin flow, oxygen delivery, and oxygen consumption compared to normotensive infants.
    • Fractional oxygen extraction and blood lactate concentrations were similar between groups.
    • Following treatment for hypotension, oxygen delivery and consumption increased, while fractional oxygen extraction and lactate remained unchanged.

    Conclusions:

    • Peripheral tissue oxygenation measurements, including oxygen delivery and consumption, are valuable for understanding pathophysiological changes during hypotension in preterm infants.
    • Reduced oxygen delivery during hypotension did not lead to evidence of tissue injury or a switch to anaerobic metabolism.
    • NIRS monitoring can provide insights into circulatory adjustments in vulnerable preterm neonates.