Document Detail

Accuracy of the volume and pressure displays of high frequency oscillators.
MedLine Citation:
PMID:  14977906     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine the effect of frequency on the accuracy of volume and pressure displays of high frequency oscillators. METHODS: The effect of frequency on the displayed volume of the Stephanie, Dräger Babylog 8000 Plus, and SLE 5000 oscillators was assessed. A sine wave pump delivered a constant tidal volume at frequencies of 5-15 Hz to the patient manifold of the oscillators. The displayed volumes at each frequency were compared with the delivered volume. The effect of frequency on displayed pressure was assessed by connecting the oscillator's patient manifold to a lung model; three types of oscillator were studied (SensorMedics 3100A, SLE 5000, and Stephanie). Airway pressure was measured from the manifold using a pressure transducer and non-compliant tubing; the pressure measuring system had a flat frequency response to 30 Hz. RESULTS: The SLE 5000 volume display overread the delivered volume (by about 5%), but was not affected by frequency. At 5 Hz, the Dräger Babylog 8000 Plus and the Stephanie underread the delivered volume (by about 20%). Increasing frequency resulted in a greater discrepancy between the delivered and displayed volume with the Stephanie, but a smaller discrepancy with the Dräger Babylog 8000 Plus. Altering frequency had a small effect (maximum difference 6%) on the relation between the displayed and delivered pressure for all three oscillators. CONCLUSION: Frequency affects the accuracy of displayed volumes and, to a lesser extent, displayed pressures of high frequency oscillators. The results emphasise that data displayed by new devices should not be uncritically accepted.
J A Leipälä; S Iwasaki; A Milner; A Greenough
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of disease in childhood. Fetal and neonatal edition     Volume:  89     ISSN:  1359-2998     ISO Abbreviation:  Arch. Dis. Child. Fetal Neonatal Ed.     Publication Date:  2004 Mar 
Date Detail:
Created Date:  2004-02-23     Completed Date:  2004-04-29     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  9501297     Medline TA:  Arch Dis Child Fetal Neonatal Ed     Country:  England    
Other Details:
Languages:  eng     Pagination:  F174-6     Citation Subset:  AIM; IM    
Children Nationwide Neonatal Intensive Care Unit, King's College Hospital, London, UK.
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MeSH Terms
Chronic Disease
High-Frequency Ventilation / instrumentation,  standards*
Infant, Newborn
Lung Diseases / prevention & control*
Respiratory Distress Syndrome, Newborn / therapy*
Sensitivity and Specificity

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