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Volume delivery during high frequency oscillation

G Dimitriou1, A Greenough, V Kavvadia

  • 1Children Nationwide Regional Neonatal Intensive Care Centre, King's College Hospital, London.

Archives of Disease in Childhood. Fetal and Neonatal Edition
|May 13, 1998
PubMed
Summary
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High-frequency oscillation (HFO) in preterm infants can deliver volumes exceeding anatomical dead space, potentially improving alveolar ventilation. Delivered volume is influenced by disease severity, not just frequency or amplitude.

Area of Science:

  • Neonatal respiratory support
  • Mechanical ventilation strategies

Background:

  • High-frequency oscillation (HFO) is a rescue therapy for preterm infants with respiratory distress.
  • Optimizing delivered volume during HFO is crucial for effective ventilation and lung protection.

Purpose of the Study:

  • To quantify delivered volume during HFO in preterm infants.
  • To identify factors influencing delivered volume beyond frequency and amplitude.

Main Methods:

  • Studied 20 preterm infants (median gestational age 29 weeks) on 45 occasions using two oscillator types.
  • Measured delivered volume using a calibrated pneumotachograph system under clinical conditions.
  • Analyzed relationships between delivered volume, oxygenation index (OI), and alveolar-arterial oxygen difference (AaDO2).

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Main Results:

  • Median delivered volume was 2.4 ml/kg (range 1.0–3.6 ml/kg).
  • Delivered volume exceeded 2.0 ml/kg in 32 instances and 3.0 ml/kg in seven instances.
  • Significant inverse correlations were found between delivered volume and OI (r = -0.51) and AaDO2 (r = -0.54), indicating higher delivered volumes with greater disease severity.

Conclusions:

  • Delivered volume during HFO can surpass anatomical dead space in some preterm infants.
  • This suggests potential for direct alveolar ventilation, contributing to improved gas exchange.
  • Disease severity is a key factor influencing delivered volume during HFO.