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[Cerebral perfusion in newborn infants treated with high-frequency oscillation ventilation]
R L Schlösser1, B Voigt, V von Loewenich
1Zentrum für Kinderheilkunde und Jugendmedizin, Abteilung für Neonatologie, Universität Frankfurt. rschloesser@zki.uni-frankfurt.de
Klinische Padiatrie
|February 24, 2001
Summary
High-frequency oscillatory ventilation (HFOV) did not significantly alter cerebral blood flow or oxygenation in neonates compared to conventional mechanical ventilation (CMV). Cerebral oxygenation changes were linked to PCO2 levels.
Area of Science:
- Neonatal physiology
- Respiratory support
- Cerebral hemodynamics
Background:
- High-frequency oscillatory ventilation (HFOV) is used in neonates.
- Previous studies suggest HFOV may affect cerebral blood flow.
- Near-infrared spectroscopy (NIRS) allows continuous monitoring of cerebral oxygenation.
Purpose of the Study:
- To investigate the effects of switching from HFOV to conventional mechanical ventilation (CMV) on cerebral hemodynamics and oxygenation in neonates.
- To compare cerebral arterial flow velocities and oxygenated hemoglobin levels between HFOV and CMV.
Main Methods:
- 19 measurements were conducted in 18 mechanically ventilated neonates.
- Cerebral arterial flow velocity was measured using Doppler ultrasound.
- Cerebral oxygenation was monitored continuously using NIRS.
- Ventilation was switched from HFOV to CMV, and parameters were recorded.
Main Results:
- No significant changes in Doppler-measured cerebral arterial flow velocity were observed when switching from HFOV to CMV.
- NIRS parameters (HbO, HbR, HbT) remained stable during the ventilation mode change.
- Changes in oxygenated hemoglobin (HbO) correlated with changes in PCO2.
Conclusions:
- HFOV does not appear to have a significant impact on cerebral hemodynamics or oxygenation compared to CMV in stable neonates.
- Cerebral oxygenation monitoring with NIRS is sensitive to PCO2 fluctuations during mechanical ventilation changes.