Innovative Treatment of Carbapenem-Resistant Pseudomonas aeruginosa Pneumonia with Carrimycin: A Case Report.

Carbapenem-resistant Pseudomonas aeruginosa is a common multidrug-resistant bacterium encountered in clinical practice. This pathogen causes pneumonia, which is difficult to treat owing to the limited choice of antimicrobial drugs, resulting in a relatively high mortality rate. Carrimycin is a new macrolide antibiotic with broad-spectrum antibacterial and potential immunomodulatory effects. Herein, we report a case of severe pneumonia caused by carbapenem-resistant Pseudomonas aeruginosa that presented with septic shock and Acute Respiratory Distress Syndrome (ARDS). Initially, we used piperacillin-tazobactam and ceftazidime-avibactam but without satisfactory results. Finally, we administered carrimycin in combination with piperacillin-tazobactam; the patient's condition improved, and he was successfully weaned off the ventilator. Therefore, the combined use of carrimycin should be considered for patients infected with carbapenem-resistant Pseudomonas aeruginosa who do not respond to conventional anti-infection treatments.