Univariate regression model showed that factors increase the risk of ventilator-associated pneumonia include: unconsciousness on admission (OR = 2.49, p=0.023), Emergency intubation (OR = 2.13; p = 0.034), endotracheal tube without suction system (OR = 2.87, p = 0.028), Glasgow score <= 8 (OR = 5.34, p=0.012), number of days on mechanical ventilation ≥ 5 (OR = 4.53, p<0.0001), number of days in Emergency Department (OR = 4.43, p<0.0001), the low level of care for ventilator system (OR = 2.22, p=0.033) and the low level of patient's physical care level (OR = 2.47; p=0.013).