Noninvasive mechanical ventilation may be useful in treating patients who fail weaning from invasive mechanical ventilation: a randomized clinical trial

Table 1 Baseline characteristics of patients who failed spontaneous breathing trial

	NPPV (n = 28)	IMV (n = 37)	P value
Age, years	67.6 ± 15.5	59.7 ± 17.6	0.06
Gender, male/female	15/13	23/14	0.61
APACHE II score at admission	20 ± 6.8	18.0 ± 5.9	0.27
Duration of mechanical ventilation, days	7.3 ± 4.1	7.3 ± 4.1	0.98
Causes of mechanical ventilation, number (percentage)
COPD aggravation and asthma	10 (35.6%)	13 (35.1%)
Heart diseases	7 (25%)	4 (11%)
Respiratory diseases	1 (3.6%)	2 (5.4%)
Post-surgery respiratory failure	5 (18%)	11 (29.8%)
Acute pulmonary lesion	0 (0%)	2 (5.4%)
Pneumonia	3 (11%)	1 (2.7%)
Tuberculosis	1 (3.6%)	2 (5.4%)
Thoracic trauma	1 (3.6%)	1 (2.7%)

Values are mean ± standard deviation or number (percentage). P value indicates comparison between treatment groups using t test or chi-square test. APACHE II, Acute Physiologic And Chronic Health Evaluation II; COPD, chronic obstructive pulmonary disease; IMV, invasive mechanical ventilation; NPPV, noninvasive mechanical ventilation.

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