Clinical evaluation of ventilation mode on acute exacerbation of chronic obstructive pulmonary disease with respiratory failure

Table 1 Baseline characteristics of the enrolled patients

Characteristic	VCV group (n = 200)	PCV group (n = 200)	P value
Age (mean ± SD, years)	67.6 ± 10.3	68.4 ± 11.1	0.60
Sex (male, %)	58	60	0.81
Body mass index (mean ± SD, kg/m2)	25.3 ± 3.6	24.8 ± 3.4	0.23
Hypertension (%)	38	42	0.62
Diabetes mellitus (%)	28	32	0.57
Coronary artery disease (%)	22	19	0.68
Smoking history (%)	76	78	0.85
APACHE II score (mean ± SD)	18.4 ± 5.8	17.9 ± 6.3	0.53
MMRC dyspnea scale [median (IQR)]	3 (2-4)	3 (2-4)	0.78

PCV: Pressure-controlled ventilation; VCV: Volume-controlled ventilation; APACHE II: Acute Physiology and Chronic Health Evaluation II; MMRC: Modified Medical Research Council.