Table 2 Ventilatory settings used during the study^a

From: Prone position and recruitment manoeuvre: the combined effect improves oxygenation

	SP				PP				SP
Ventilatory setting	Time 0	Time 1 (RM1) time 2		Time 3	Time 4 (RM2) time 5		Time 6 (RM3) time 7		Time 8
V_t, mL	536 ± 105	522 ± 106.8	534 ± 102	532 ± 102	511 ± 99	511 ± 98.7	512 ± 97.8	512 ± 98.2	512 ± 98
RR, breaths/minute	19 ± 4.1	19.5 ± 4.1	19.5 ± 4.3	19.5 ± 4.3	20 ± 4.4	20 ± 4.4	20 ± 4.4	20 ± 4.4	20 ± 4.4
V^°, L/minute	10.5 ± 2.3	10.2 ± 2	10.4 ± 2.2	10.4 ± 2.1	10.2 ± 2.2	10.2 ± 2.2	10.2 ± 2.2	10.3 ± 2.2	10.3 ± 2.2
External PEEP, cmH₂O	9.8 ± 2.8	9.8 ± 2.8	9.8 ± 2.8	9.8 ± 2.8	10.1 ± 2.6	10.1 ± 2.6	10.1 ± 2.6	10.1 ± 2.6	10.3 ± 2.7
Total PEEP, cmH₂O	10.7 ± 2.8	10.6 ± 2.8	10.8 ± 2.9	10.8 ± 2.7	10.9 ± 3	11.4 ± 3.3	10.5 ± 2.8	10.6 ± 2.9	10.8 ± 3
Paw, cmH₂O	31.7 ± 4.7	30.5 ± 6	30.2 ± 5.7	31 ± 4.9	29 ± 5.2	30.5 ± 5.2	29 ± 5.9	28 ± 5.3	29 ± 5.3
Pplat, cmH₂O	24.6 ± 5.8	24.5 ± 5.7	24 ± 5.5	25.3 ± 5^b	24.2 ± 4.6	24 ± 4.1	23.4 ± 4.9	22.7 ± 5^c	23 ± 5.1

^aPaw: peak airway pressure; Pplat: plateau pressure; V_t: tidal volume; RR: respiratory rate; V°: minute volume; PEEP: positive end expiratory pressure; SP: supine position; PP: prone position; RM recruitment maneuver. Ventilatory settings were measured each time (from time 0 to time 8) in SP and PP (see Figure 2): inclusion, before and after each RM, before PP, and at the end of the protocol (1 hour after turning to the SP). ^bTime 3 versus time 2: P = 0.035; ^ctime 6 versus time 7: P = 0.02. All data are expressed as means ± standard deviations.

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