Slow blood sampling from an umbilical artery catheter prevents a decrease in cerebral oxygenation in the preterm...

Area of Science:

• Neonatalogy
• Pediatric Cardiology
• Medical Devices

Background:

• Umbilical artery catheters (UAC) in a high position can affect cerebral blood flow and oxygenation in preterm infants.
• Clinically significant changes in cerebral oxygenation may contribute to neurological impairment in neonates.

Purpose of the Study:

• To determine the effects of different blood sampling speeds via UAC on cerebral oxygenation in preterm infants.
• To investigate if altering sampling speed can mitigate negative impacts on neonatal cerebral oxygenation.

Main Methods:

• Thirty pairs of measurements were taken from 20 preterm infants (median gestational age: 30.14 weeks).
• Blood samples (2.3 mL) were drawn at two speeds (20 and 40 seconds) from high-position UACs.
• Cerebral oxygenation was monitored noninvasively using near-infrared spectroscopy, measuring oxygenated hemoglobin (O2Hb) and tissue oxygenation index (TOI).

Main Results:

• A significant decrease in O2Hb and TOI was observed during 20-second sampling (median DeltaO2Hb: -1.5 micromol/L; median DeltaTOI: -0.6%).
• Deoxygenated hemoglobin (HHb) showed a median increase of 0.4 micromol/L during rapid sampling.
• No significant changes in O2Hb, HHb, or TOI were detected when sampling time was extended to 40 seconds.

Conclusions:

• Blood withdrawal over 20 seconds from a high-position UAC significantly reduces cerebral oxygenation in preterm infants.
• Extending the blood sampling time to 40 seconds effectively prevents detrimental changes in cerebral oxygenation.
• This finding suggests a practical method to safeguard cerebral oxygenation during UAC procedures in neonates.