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Table 1 Main ventilatory variables and inspiratory efforts at baseline

From: Comparative evaluation of three interfaces for non-invasive ventilation: a randomized cross-over design physiologic study on healthy volunteers

 

SBI

Baseline settings

SBE

 

FM

HS

HN

V T ml

787 ± 220

596 ± 147

794 ± 250

821 ± 240

842 ± 275

RRn breath/minute

13 ± 6

15 ± 7

14 ± 5

14 ± 5

14 ± 6

V E L/minute

9.6 ± 3.9

8.1 ± 2.3

10.2 ± 2.7

11.1 ± 4.9

10.7 ± 4.1

PTPdi/breath

20.0 ± 10.4

17.0 ± 11.0

16.6 ± 10.0

15.7 ± 10.7

17.4 ± 15.6

PTPdi/minute

241 ± 117

204 ± 81

201 ± 92

198 ± 109

190 ± 116

PTPdi/L

27.6 ± 15.5

30.2 ± 16.8

21.6 ± 10.5

20.9 ± 13.2

20.4 ± 14.8

WOB J/breath

0.456 ± 0.214

0.335 ± 0.142

0.400 ± 0.302

0.447 ± 0.309

0.460 ± 0.379

WOB J/minute

5.61 ± 2.71

4.54 ± 2.49

5.11 ± 3.00

6.60 ± 7.49

5.53 ± 3.98

WOB J/L

0.585 ± 0.206

0.525 ± 0.188

0.494 ± 0.172

0.569 ± 0.277

0.504 ± 0.274

Delay,TR-insp (s)

NA

0.181 ± 0.086

0.354 ± 0.081

0.276 ± 0.091

NA

Delay,TR-exp (s)

NA

0.275 ± 0.038

0.395 ± 0.093

0.301 ± 0.044

NA

TI,Synchrony (%)

NA

90 ± 4

79 ± 7

83 ± 4

NA

  1. Data are presented as mean ± SD. Baseline data; n = 12 healthy volunteers included. Baseline settings for FM, HS, HN: PEEP 5 cmH2O; PS 5 cmH2O, Ramp 0; Exp trigger: 25%; FiO2: 21%. VT, tidal volume; VE, minute ventilation; RRn, neural respiratory rate; PTPdi, pressure-time product of the transdiaphragmatic pressure; WOB, work of breathing; FM, face mask; HS, helmet standard; HN, helmet next; SBI, initial spontaneous breathing; SBE, end spontaneous breathing; PEEP, positive end-expiratory pressure; PS, pressure support; Exp trigger, expiratory trigger; delay, TR-insp, inspiratory trigger delay; Delay,TR-exp, expiratory trigger delay; TI,Synchrony, synchrony time as% of patient inspiratory time; NA, not applicable.