Acquisition of Pseudomonas aeruginosa and its resistance phenotypes in critically ill medical patients: role of colonization pressure and antibiotic exposure

Table 4 Pseudomonas aeruginosa resistance to antibiotics when first detected and cross-transmission cases^a

Resistant antibiotics	Upon admission as susceptible	Acquired in ICU as susceptible	Acquired in ICU as resistant
Ceftazidime (n =40)	2 (5)	8 (20) [0]	30 (75) [15]
Carbapenems (n =46)	2 (4)	5 (11) [0]	39 (85) [16]
Piperacillin-tazobactam (n =31)	1 (3)	11 (35) [1]	19 (61) [11]
Quinolones (n =39)	2 (5)	8 (21) [0]	29 (74) [15]
Amikacin (n =1)	0	0	1 (100) [1]
MDR (n =31)	2 (6)	7 (23) [0]	22 (71) [14]

^aICU, Intensive care unit; MDR, Multidrug-resistant. Number of patients in whom P. aeruginosa resistant to the different antipseudomonal antibiotics was isolated during ICU stay, resistance status of the strains when first detected (percentage) and number of cases due to cross-transmission [in brackets].

ISSN: 1364-8535