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Figure 6 | Critical Care

Figure 6

From: Bench-test comparison of 26 emergency and transport ventilators

Figure 6

Pressure support accuracy under different levels of leaks. Values are provided as % difference as compared to settings (pressure support (PS) = 10 cm H2O with an additional positive end-expiratory pressure (PEEP) level = 5 cm H2O); dotted line represents the a priori defined accuracy range (±10%); three levels of leaks were used: L1 = 3.5 to 4.0 L/minute; L2 = 5.0 to 7.0 L/minute; L3 = 9.0 to 12.5 L/minute. Several devices were quite insensitive to leaks, with PS variation near zero; statistical analysis evaluated the impact of leaks over PS accuracy and a P-value equal to or below 0.05 was considered significant; *P <0.05; **P <0.005. Of the ETV, 10/15 provided PS within an accuracy range equal to or less than 10%. If 4/15 ETV were statistically influenced by leaks, only one might be considered as influenced with a clinical relevance, the other one being within the accuracy range.

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