Table 2.
Hourly Ventilatory Variables Prior to Barotrauma
| Patient | Mode of Respiratory Support | Proportion Time, % | PEEP, cm H2O, Median (IQR) | Peak Inspiratory Pressure (PEEP Plus Pressure Support), cm H2O, Median (IQR) | Fio2, %, Median (IQR) | Respiratory Rate, Breaths Per Minute, Median (IQR) | VT, mL, Median (IQR) | VT/Ideal Body Weight, mL/kg, Median (IQR) | Minute Ventilation, L/min, Median (IQR) | Peripheral Oxygen Saturation, %, Median (IQR) | Pao2, kPa, Median (IQR) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | CPAP | 100 | 10 (10–10) | — | 50 (50–55) | 27 (25–29) | 604 (506–716) | 8.5 (7.1–10.0) | 16.2 (13.0–19.5) | 93 (92–95) | 10.1 (9.8–10.8) |
| 2 | CPAP | 100 | 10 (10–10) | — | 75 (70–75) | 36 (35–40) | 482 (414–549) | 7.4 (6.4–8.4) | 17.2 (15.1–21.0) | 94 (92–96 | 8.8 (7.8–9.9) |
| 3 | Facemask O2 | 60 | — | — | 80 (80–80) | 31 (28–33) | — | — | — | 92 (91–94) | 8.2 (8.0–9.1) |
| CPAP | 40 | 10 (10–10) | — | 70 (60–80) | 32 (30–33) | 487 (465–578) | 7.1 (6.8–8.4) | 18.1 (17.6–22.4) | 93 (92–94) | 9.3 (9.1–9.6) | |
| 4 | NIV | 30 | 10 (10–10) | 15 (15–15) | 53 (43–56) | 32 (26–33) | 715 (628–754) | 9.8 (8.6–10.3) | 21.3 (18.2–10.3) | 93 (92–94) | 9.1 (8.5–9.8) |
| CPAP | 35 | 8 (6–8) | — | 30 (30–30) | 24 (23–24) | 720a | 9.8a | 19.4a | 94 (91–94) | — | |
| Facemask O2 | 35 | — | — | 35 (35–35) | 20 (19–21) | — | — | — | 94 (93 - 94) | — | |
| 5 | CPAP | 30 | 12 (12–12) | — | 45 (45–49) | 51 (50–53) | 415 (401–431) | 5.7 (5.5–6.0) | 19.9 (19.4–23.0) | 96 (95–97) | 9.6 (9.0–10.1) |
| NIV | 70 | 15 (12–15) | 20 (17–24) | 50 (45–60) | 45 (44–47) | 501 (456–507) | 6.9 (6.3–7.0) | 22.7 (21.4–22.8) | 98 (90–98) | 8.4 (7.9–8.6) | |
| 6 | IMV (PC-BiPAP) | 100 | 12 (10–12) | 28 (28–30) | 55 (40–55) | 18 (18–18) | 475 (452–503) | 6.7 (6.4–7.1) | 8.6 (8.2–9.1) | 93 (90–94) | 9.1 (8.2–9.6) |
| 7 | CPAP | 35 | 10 (10–10) | — | 75 (70–75) | 40 (38–42) | 478 (455–522) | 5.9 (5.6–6.4) | 18.8 (18.2–21.0) | 92 (90–94) | 8.9 (8.2–9.1) |
| IMV (PC-BiPAP) | 65 | 12 (10–12) | 30 (30–31) | 55 (55–70) | 20 (20–20) | 562 (496–602) | 6.9 (6.1–7.4) | 11.1 (9.9–12.2) | 90 (89–92) | 8.5 (7.8–9.9) | |
| 8b | IMV | 100 | — | — | — | — | — | — | — | — | — |
CPAP = continuous positive airway pressure, IMV = invasive mechanical ventilation, IQR = interquartile range, NIV = noninvasive ventilation, PC-BiPAP = pressure-control biphasic positive airway pressure setting, PEEP = positive end-expiratory pressure, VT = tidal volume.
aSingle reading.
bData unavailable due to patient transfer > 48 hr prior to barotrauma.
Recorded during the radiological window or the 48 hr prior to barotrauma—whichever was longer or for the entire critical care admission if shorter than 48 hr.