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ORIGINAL ARTICLE |
1 Neonatal Services, Royal Women's Hospital, Carlton, Victoria, Australia
2 Biomedical Engineering Department, Royal Women's Hospital
Correspondence to:
Correspondence to:
Dr De Paoli, Department of Neonatology, Royal Women's Hospital, 132 Grattan Street, Carlton, Victoria 3053, Australia;
depaolit{at}cryptic.rch.unimelb.edu.au
Objective: To compare the resistance in vitro of different devices used for the delivery of nasal continuous positive airway pressure (NCPAP) in neonates.
Design: Flows of 48 litres/min were passed through a selection of neonatal NCPAP devices (single prong, Duotube, Argyle prong, Hudson prong, Infant Flow Driver), and the resultant fall in pressure measured using a calibrated pressure transducer.
Results: The decrease in pressure (cm H2O) for each device (size in parentheses) at a constant flow of 6 litres/min was: Duotube: (2.5), 21; (3.0), 6.2; (3.5), 2.3; single prong: (2.5), 4.4; (3.0), 2.1; (3.5), 1.2; Argyle prong: (XS), 3.6; (S), 1.9; (L), 1.5; Hudson prong: (0), 3.1; (1), 1.8; (2), 0.6; (3), 0.4; (4), 0.3; Infant Flow Driver: (small), 0.3; (medium), -0.3; (large), -0.5.
Conclusions: A large variation in the potential fall in pressure may occur in the clinical setting. Devices with short double prongs had the lowest resistance to flow. These results have implications in the selection of the optimal device/s for clinical application and for future comparisons in randomised trials of NCPAP in neonates.
Keywords: positive pressure respiration; airway resistance
Abbreviations: CPAP, continuous positive airway pressure; NCPAP, nasal continuous positive airway pressure
Relevant Article
Arch. Dis. Child. Fetal Neonatal Ed. 2002 87: F2.
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A G De Paoli, R Lau, P G Davis, and C J Morley Pharyngeal pressure in preterm infants receiving nasal continuous positive airway pressure Arch. Dis. Child. Fetal Neonatal Ed., January 1, 2005; 90(1): F79 - F81. [Abstract] [Full Text] [PDF] |
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