Table 1.

Resistance rates to carbapenems and other antipseudomonal drugs among P. aeruginosa isolates recovered in AHEPA University Hospital

Antibiotic(s)No. (%) of resistanta isolates in:
199619971998Total
Imipenem only19 (4.2)11 (2.4)8 (2.2)38 (3.0)
Meropenem only5 (1.1)3 (0.7)3 (0.8)11 (0.9)
Imipenem and meropenem83 (18.5)94 (20.5)34 (9.2)211 (16.5)
Ceftazidime121 (27.0)138 (30.1)86 (23.3)345 (27.0)
Aztreonam97 (21.7)136 (29.6)78 (21.1)311 (24.4)
Ciprofloxacin182 (40.6)163 (35.5)101 (27.4)446 (35.0)
Gentamicin115 (25.7)124 (27.0)79 (21.4)318 (24.9)
Amikacin91 (20.3)100 (21.8)61 (16.5)252 (19.7)
Piperacillin-tazobactamb 122 (27.2)141 (30.7)79 (21.4)342 (26.8)
Total isolates4484593691,276
  • a Resistance was defined in accordance with NCCLS interpretive criteria.

  • b Tazobactam tested at a fixed concentration of 4 μg/ml.