Research Article
Ex Vivo Evaluation of Secretion-Clearing Device in Reducing Airway Resistance within Endotracheal Tubes
Table 2
Pressure drop characteristics of tested and control endotracheal tubes at 60 L/minute.
| Type of endotracheal tube | | Mean pressure drop | Standard deviation | Min. pressure drop | Max. pressure drop | t-test value vs. control | value | t-test value vs cleared tube | value |
| All endotracheal tubes | | | | | | | | | | All controls | 3 | 10.8 | 0.27 | | | n/a | | −8.63 | <0.001 | Extubated, not cleared (pre) | 40 | 21.8 | 13.30 | 10.2 | 77.8 | 5.27 | <0.001 | 4.80 | <0.001 | Extubated, cleared (post) | 40 | 11.8 | 0.29 | 9.5 | 16.8 | −8.63 | <0.001 | n/a | | 7.0 mm diameter | | | | | | | | | | Control | 1 | 14.5 | 0.14 | | | n/a | | −3.69 | 0.035 | Extubated, not cleared (pre) | 4 | 19.2 | 1.88 | 16.4 | 20.4 | 4.94 | 0.016 | 5.20 | 0.014 | Extubated, cleared (post) | 4 | 15.9 | 0.75 | 15.0 | 16.8 | −3.69 | 0.035 | n/a | | 7.5 mm diameter | | | | | | | | | | Control | 1 | 11.8 | 0.01 | | | n/a | | −3.30 | 0.004 | Extubated, not cleared (pre) | 17 | 24.1 | 9.12 | 12.0 | 46.0 | 4.33 | <0.001 | 4.13 | 0.001 | Extubated, cleared (post) | 17 | 12.5 | 0.86 | 11.4 | 14.3 | −3.30 | 0.004 | n/a | | 8.0 mm diameter | | | | | | | | | | Control | 1 | 9.1 | 0.04 | | | n/a | | −10.76 | <0.001 | Extubated, not cleared (pre) | 19 | 23.0 | 17.42 | 10.2 | 77.8 | 3.55 | 0.002 | 3.23 | 0.004 | Extubated, cleared (post) | 19 | 10.3 | 0.48 | 9.5 | 11.3 | −10.76 | <0.001 | n/a | |
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