Table 1 Differences in tidal volumes (VT) measured by turbine driven ventilator and lung simulator at different levels of PEEP in the bench study.

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

Simulated Condition

(TDV-LS) PEEP 5 cmH2O

(TDV-LS) PEEP 8 cmH2O

(TDV-LS) PEEP 10 cmH2O

(TDV-LS) PEEP 12 cmH2O

P value

Normal

51 (3)°+

31.1(3.5)*+

21.8 (2)*°

 

<0.001

Restrictive

61 (3)°+§

10,4 (1.3)*+§

1,1 (1.6)*°§

−11,9 (1.9)*°+

<0.001

Obstructive

164 (2)°+

132,5 (1.6)*+

127,3(3.1)*°

 

<0.001

  1. Data are expressed in ml and reported as mean (±SD).
  2. PEEP: positive end expiratory pressure; TDV: turbine driven ventilator; LS: lung simulator; (TDV-LS): difference between VT measurements by turbine driven ventilator and lung simulator.
  3. *Different from 5; °different from 8, +different from 10, §different from 12.
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