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Table 1 Patients’ characteristics

From: Validation of the flow index to detect low inspiratory effort during pressure support ventilation

Variables

N = 100

Male sex

67 (67)

Age (years)

53 (39–64)

Type of brain injury

 Stroke

44 (44)

 Post-operation for brain tumors

37 (37)

 Traumatic brain injury

19 (19)

GCS

10 (7–11)

Pressure support (cmH2O)

7 (6–8)

PEEP (cmH2O)

5 (5–8)

FiO2

0.4 (0.4–0.4)

RR (breaths/min)

19 (16–22)

VT (ml/kg PBW)

8.6 (7.4–9.8)

MV (L/min)

10.4 (8.2–12.7)

RSBI

35 (25–47)

PaO2/FiO2

245 (198–317)

PaCO2 (mmHg)

37 (34–41)

∆Pes (cmH2O)

4.6 (2.7–8.3)

PEEPi (cmH2O)

1.2 (0.8–2.1)

Pmus (cmH2O)

5.6 (3.2–10.6)

PTPes per breath (cmH2O•s)

3.8 (2.3–7.3)

PTPes per minute (cmH2O•s/min)

72.6 (46.6–138.6)

WOB (J/L)

0.20 (0.12–0.57)

Flow index

1.7 (1.4–2.2)

  1. Categorical variables are shown as number (percentage); continuous variables are shown as median (interquartile range)
  2. GCS Glasgow Coma Scale, MV minute ventilation, PBW predicted body weight, PEEP positive end-expiratory pressure, PEEPi intrinsic positive end-expiratory pressure, Pmus inspiratory muscle pressure, PTPes esophageal pressure–time product, ΔPes tidal swing of esophageal pressure, RR respiratory rate, RSBI rapid shallow breathing index, VT tidal volume, WOB work of breathing