Table 3 Tidal volumes (VT) measured by turbine driven ventilator and pneumotacograph in the human study.

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

Volunteer N°

TDV VT (ml)

P VT (ml)

P value

1

651 (62.5)

606 (52.8)

<0.001

2

795 (49.1)

784 (38.5)

0.22

3

911 (89.3)

945 (67.1)

0.03

4

697 (74.2)

693 (97.2)

<0.001

  1. All measurements were done at PEEP and nHPSV of 8 cmH2O. Data are expressed in ml and reported as mean ± SD; PEEP: positive end expiratory pressure; TDV: VT measured by turbine driven ventilator; P: VT measured by pneumotachograph.
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