Table 2 Differences in tidal volumes (VT) measured by turbine driven ventilator and lung simulator at different levels of leak flow.

From: Tidal Volume Estimation during Helmet Noninvasive Ventilation: an Experimental Feasibility Study

Simulated Condition

(TDV-LS) LF 30 L/min

(TDV-LS) LF 50 L/min

(TDV-LS) LF 80 L/min

P value

Normal

31(4)+

31(3)+

24(4)*°

<0.001

  1. Data are expressed in ml and reported as mean (±SD).
  2. LF: leak flow (expressed in liters per minute); TDV: turbine driven ventilator; LS: lung simulator; (TDV-LS): difference between VT measurements by turbine driven ventilator and lung simulator.
  3. *Different from 30; °Different from 50; +Different from 80.
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