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Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition) ›› 2024, Vol. 18 ›› Issue (01): 43-48. doi: 10.3877/cma.j.issn.1674-1358.2024.01.007

• Research Article • Previous Articles    

Resistance and combination drug sensitivity test of carbapenem-resistant Pseudomonas aeruginosa

Yongtao Wei1,(), Songxia Wang2, Aimei Su1, Dongping Wang1   

  1. 1. Department of Clinical Laboratory, Qingdao Eighth People’s Hospital, Qingdao 266100, China
    2. Department of Blood Transfusion, Qingdao Eighth People’s Hospital, Qingdao 266100, China
  • Received:2023-08-10 Online:2024-02-15 Published:2024-04-23
  • Contact: Yongtao Wei

Abstract:

Objective

To analyze drug resistance of carbapenem resistant Pseudomonas aeruginosa (CRPA), and to investigate the in vitro susceptibility test result of colistin (COL) combined with meropenem (MEM), ceftazidime (CAZ), piperacillin/tazobactam (TZP), ciprofloxacin (CIP) and amikacin (AK) combined with TZP, CIP and TZP combined with CIP to CRPA for screen the effective anti-infective therapy.

Methods

Total of 22 strains of CRPA were isolated from clinic specimens from Qingdao Eighth People’s Hospital from January 2022 to December 2022. The minimal inhibitory concentration (MIC) of antimicrobial agents against CRPA strains was determined by micro broth dilution method. Combined antimicrobial susceptibility test was performed by the chessboard dilution method. Fractional inhibitory concentration (FIC) index was calculated to determine the combined effect.

Results

The resistance rates of CRPA to piperacillin (PRL), cefoperazone/sulbactam (SCF), Aztreonam (ATM), imipenem (IPM) and MEM were higher than 90%. The resistance rates to cefepime (FEP), TZP, levofloxacin (LEV), CAZ, CIP, gentamicin (CN), tobramycin (TOB) and AK were 81.8% (18/22), 77.3% (17/22), 77.3% (17/22), 72.7% (16/22), 68.2% (15/22), 63.6% (14/22), 63.6% (14/22) and 54.5% (12/22), respectively. The resistance rates to CZA and COL were 9.1% (2/22) and 0 (0/22), respectively. The results of antimicrobial synergy study showed that the synergistic rates of COL and MEM were 59.1% (13/22), and the sum of synergistic rates and additive rates were 100% (22/22). The synergistic rates of COL + CAZ, COL + TZP, COL + CIP, AK + CIP, TZP + CIP were 45.4% (10/22), 54.5% (12/22), 31.8% (7/22), 22.7% (5/22), 31.8% (7/22) and 9.1% (2/22), and the sum of synergistic rates and additive rates were 81.8% (18/22), 90.9% (20/22), 77.3% (17/22), 77.3% (17/22), 68.2% (15/22) and 59.1% (13/22), respectively. No antagonism effect was observed for all combinations.

Conclusions

CZA alone is effective for CRPA sensitive strains. Among all the combinations, COL + MEM had the highest synergy rate and addition rate, TZP and CIP has the lowest synergy rate and addition rate, which could provide reference for clinical experience medication.

Key words: Carbapenem-resistant Pseudomonas aeruginosa, Drug resistance, Combined antimicrobial susceptibility test, Fractional inhibitory concentration index

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