Determinants of weaning success in patients with prolonged mechanical ventilation

Table 4 Inspiratory muscle function and effort in weaned and unweaned patients

Group	MIP, cm H₂O	Pdi_max, cm H₂O	Pdisw/Pdi_max, percentage	TTdi
Successful weaning
T₀	45.2 ± 19.5	34.9 ± 18.9^a	36.0 ± 15.8^a	0.13 ± 0.065^b
T₁	57.3 ± 18.2^b	43.0 ± 20.04^a	23.1 ± 7.9^a,b	0.08 ± 0.029
Failed weaning
T₀	32.7 ± 18.2	25.4 ± 17.3	54.4 ± 25.5	0.21 ± 0.122^a,b
T₁	38.6 ± 13.5^b	27.7 ± 12.5	42.5 ± 22.9^b	0.14 ± 0.054^a

^aP < 0.05 differences for each variable within groups; ^bP < 0.05 differences for each variable between groups. MIP, maximum inspiratory pressure; Pdi_max, maximum transdiaphragmatic pressure; Pdisw, tidal diaphragmatic pressure; TTdi, tension-time index of diaphragm.

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