Table 1 Ventilation protocols used

1

Pulmonetic LTV-1000

Assist-control

Volume

TV = 275, PEEP = 4, rate = 20, Ti = 1

a

2

Pulmonetic LTV-1000

Assist-control

Volume

TV = 320, PEEP = 4, rate = 20, Ti = 1

a

3

Pulmonetic LTV-1000

Assist-control

Volume

TV = 400, PEEP = 4, rate = 20, Ti = 1

a

4

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 15, PEEP = 5, rate = 20, Ti = 1

a

5

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 20, PEEP = 5, rate = 20, Ti = 1

a

6

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 25, PEEP = 5, rate = 20, Ti = 1

a

7

Respironics BiPAP Synchrony

Spontaneous-timed

Flow (pressure support)

PIP = 10, PEEP = 5, Ti = 1.4, rate = 20

a

8

Respironics BiPAP Synchrony

Spontaneous-timed

Flow (pressure support)

PIP = 15, PEEP = 5, Ti = 1.4, rate = 20

a

9

Respironics BiPAP Synchrony

Spontaneous-timed

Flow (pressure support)

PIP = 20, PEEP = 5, Ti = 1.4, rate = 20

a

10

Respironics BiPAP Synchrony

Spontaneous-timed

Flow (pressure support)

PIP = 15, PEEP = 4, Ti = 1.4

a

11

Respironics BiPAP Synchrony

Spontaneous-timed

Flow (pressure support)

PIP = 15, PEEP = 6, Ti = 1.4

a

12

Respironics BiPAP Synchrony

Spontaneous-timed

Flow (pressure support)

PIP = 15, PEEP = 8, Ti = 1.4

a

13

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 10, PEEP = 5, rate = 20, Ti = 1

b

14

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 15, PEEP = 5, rate = 20, Ti = 1

b

15

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 20, PEEP = 5, rate = 20, Ti = 1

b

16

Versamed iVent

Assist-control

Time (pressure limited)

PIP = 25, PEEP = 5, rate = 20, Ti = 1

b

17

Versamed iVent

Assist-control

Volume

TV = 260, PEEP = 4, rate = 20, Ti = 1

c