Work of breathing using different interfaces in spontaneous positive pressure ventilation: helmet, face-mask, and endotracheal tube
Purpose Noninvasive positive pressure ventilation (NPPV) using a helmet is expected to cause inspiratory trigger delay due to the large collapsible and compliant chamber. We compared the work of breathing (WOB) of NPPV using a helmet or a full face-mask with that of invasive ventilation by tracheal...
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Veröffentlicht in: | Journal of anesthesia 2016-08, Vol.30 (4), p.653-662 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Purpose
Noninvasive positive pressure ventilation (NPPV) using a helmet is expected to cause inspiratory trigger delay due to the large collapsible and compliant chamber. We compared the work of breathing (WOB) of NPPV using a helmet or a full face-mask with that of invasive ventilation by tracheal intubation.
Methods
We used a lung model capable of simulating spontaneous breathing (LUNGOO; Air Water Inc., Japan). LUNGOO was set at compliance (
C
) = 50 mL/cmH
2
O and resistance (
R
) = 5 cmH
2
O/L/s for normal lung simulation,
C
= 20 mL/cmH
2
O and
R
= 5 cmH
2
O/L/s for restrictive lung, and
C
= 50 mL/cmH
2
O and
R
= 20 cmH
2
O/L/s for obstructive lung. Muscle pressure was fixed at 25 cmH
2
O and respiratory rate at 20 bpm. Pressure support ventilation and continuous positive airway pressure were performed with each interface placed on a dummy head made of reinforced plastic that was connected to LUNGOO. We tested the inspiratory WOB difference between the interfaces with various combinations of ventilator settings (positive end-expiratory pressure 5 cmH
2
O; pressure support 0, 5, and 10 cmH
2
O).
Results
In the normal lung and restrictive lung models, WOB decreased more with the face-mask than the helmet, especially when accompanied by the level of pressure support. In the obstructive lung model, WOB with the helmet decreased compared with the other two interfaces. In the mixed lung model, there were no significant differences in WOB between the three interfaces.
Conclusion
NPPV using a helmet is more effective than the other interfaces for WOB in obstructive lung disease. |
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ISSN: | 0913-8668 1438-8359 |
DOI: | 10.1007/s00540-016-2168-3 |