Drug resistance of Pseudomonas aeruginosa based on the isolation sites and types of gastrointestinal diseases: An observational study.

We investigated the drug resistance status of Pseudomonas aeruginosa (P. aeruginosa) focusing on its isolation sites and types of diseases.　Materials and methods: A microbiological laboratory database was searched to identify all clinical cultures positive for P. aeruginosa.　Clinicopathologic features and susceptibility of P. aeruginosa to any antibiotics were evaluated in patients admitted to the division of upper (Upper-GI group) or lower gastrointestinal surgery (Lower-GI group).　In addition, we investigated the susceptibility of P. aeruginosa to any antibiotics based on the isolation site.　Results:P. aeruginosa was frequently detected in the sputum and urine of the Upper-GI and Lower-GI groups, respectively.　Among P. aeruginosa isolates from drain discharge, a significantly higher rate of resistance to imipenem, amikacin, and ciprofloxacin was observed; among P. aeruginosa isolates from wounds, a substantially higher proportion had resistance to imipenem and cefozopran in the Upper-GI group.　However, there was no difference between the two groups in the drug resistance of P. aeruginosa isolated from urine, sputum, blood, and ascites.　P. aeruginosa isolated from sputum showed more resistance to imipenem and ciprofloxacin than those isolated from other sites.　Conclusion: There were significant differences in the drug resistance of P. aeruginosa based on the isolation sites and types of diseases.　.