Occurrence of pendelluft under pressure support ventilation in patients who failed a spontaneous breathing trial: an observational study

Annals of Intensive Care

Table 2 Changes of respiratory variables at the lower pressure support level

Respiratory variable	All patients n = 20	Low-pendelluft group n = 12	High-pendelluft group n = 8	p-value
Δ Tidal volume, mL	− 68 [− 123: − 142]	− 56 [-105: − 30]	− 90 [− 158: − 95]	.069
Δ Respiratory rate, bpm	3 [0:7]	2 [0:7]	4 [3:11]	.270
Δ Minute ventilation, L	− 0.2 [− 1.2:0.5]	− 0.3 [− 1.2:0.4]	0 [− 1.6:1.3]	.440
Δ End-tidal CO₂, mmHg	2 [0:3]	1 [0:1]	3 [2:6]	.011
Δ p0.1, cmH₂O	1.1 [0.1–2]	1 [0.1–2.1]	1.2 [0.2–1.9]	.910
Δ RSBi, Bpm/L	17 [7-33]	13 [2–30]	23 [12–56]	.190
Δ Pendelluft, mL	1.4 [− 1.3:7.7]	− 0.5 [− 1.7: 1.1]	8.8 [5.6–12.8]	.000
To ventral ROIs, mL	0 [− 1:0]	0 [− 1.3:0]	0 [0:1.1]	.037
To dorsal ROIs, mL	1.5 [0.4:5.8]	0.5 [− 1:1.2]	7.6 [4.7:11.8]	<.001

Bpm, breaths per minute; p0.1, occlusion pressure at 100 ms; RSBi, Rapid Shallow Breathing index; ROI, region of interest. Data are expressed as median [25th:75th percentile]