Application of heart-rate variability in patients undergoing weaning from mechanical ventilation

Table 2 Weaning parameters, oxygenation status, and ventilator modes before SBT based on the outcome of SBT

Characteristics	Successful SBT	Failed SBT	P value
Characteristics	(n = 77)	(n = 24)	P value
Weaning parameters
Respiratory rate <30 per minute	70 (91)	21 (88)	0.698
Minute ventilation ≦10 L/minute	63 (82)	19 (79)	0.770
Tidal volume ≧5 ml/kg	57 (74)	15 (63)	0.276
RSBI <105/min/L	71 (92)	21 (88)	0.440
PI_max ≦20 cmH₂O	73 (95)	24 (100)	0.570
PaO₂/F_IO₂	318 ± 112	279 ± 101	0.128
Pre-SBT ventilator settings
PSV	73 (95)	21 (88)	0.674
PCV	2 (3)	1 (4)
SIMV	1 (1)	1 (4)
VCV	1 (1)	1 (4)

Data are presented as mean ± standard deviation or number (%).
F_IO₂, fraction of inspired oxygen; PaO₂, partial pressure of oxygen in arterial blood; PCV, pressure-controlled ventilation; PI_max, maximal inspiratory pressure; PSV, pressure-support ventilation; RSBI, rapid shallow-breathing index; SBT, spontaneous breathing trial; SIMV, synchronized intermittent mandatory ventilation; VCV, volume-controlled ventilation.

ISSN: 1364-8535