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Thorax 54:442-443 doi:10.1136/thx.54.5.442
  • Short paper

A physiological comparison of flutter valve drainage bags and underwater seal systems for postoperative air leaks

Table 2

Effect of lung expansion on the intersystem differences in mean minimum and maximum values of intrapleural pressure (IPPmin and IPPmax)

Intersystem difference Lung expanded Lung not expanded Difference
of means 		95% CI p value
(t test)
IPPmin (mm Hg) 3.2 0.4 2.8 0.1 to 5.5 0.042
IPPmax (mm Hg) 1.2 0.4 0.8 −0.8 to 2.4 0.31

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