Determination of resonance frequency of the respiratory system in respiratory distress syndrome
Department of
Paediatrics, 4th floor, North Wing,
St Thomas' Hospital,
London SE1 7EH
Correspondence to: Dr A D Milner.
Accepted 27
September 1998
AIM
To measure tidal
volume delivery produced by high frequency oscillation (HFO) at a range
of frequencies including the resonance frequency.
METHODSEighteen
infants with respiratory distress syndrome were recruited (median
gestation 28.7 weeks). Each was ventilated at frequencies between 8 and
30 Hertz. Phase analysis was performed at various points of the
respiratory cycle. HFO was provided by a variable speed piston device.
Resonance frequency was determined from the phase relation between the
cyclical movements of the piston and pressure changes at the airway
opening. Tidal volume was measured using a jacket plethysmograph.
RESULTSThe results
were most reproducible when analysis was performed at the end of
inspiration (within 1 Hz in nine out of 10 cases). Comparison between
tidal volume delivery at 10 Hz and resonance frequency was made in 10 subjects. Delivery was significantly higher at resonance than at 10 Hertz (mean percentage increase 92%, range 9-222%).
CONCLUSIONSThese
preliminary findings suggest that there is improved volume delivery at
resonance frequency.
Keywords: phase analysis; high frequency oscillation; prematurity; resonance frequency
© 1999 by Archives of Disease in Childhood
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This article has been cited by other articles:
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Lee, S, Milner, A D
(2000). Resonance frequency in respiratory distress syndrome. Arch. Dis. Child. Fetal Neonatal Ed.
83: 203F-206
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