“…Bronchial bacterial colonization has been widely investigated in patients with chronic lung disease and, following this hypothesis, Ioanas et al [6] performed bilateral protected specimen brush and lung tissue biopsy during surgical procedures on patients with resectable lung cancer and found that almost half of them presented with bronchial colonization with at least one potential pathogenic micro-organism. Based on this strategy, Bouza et al [7] performed a prospective randomized open-label study of major heart surgery (MHS) patients requiring MV for [48 h with the use of preemptive broad-spectrum treatment, and this strategy did not reduce the incidence of VAP but increased the rate of resistant pathogens.…”