RESUMO
Management of cystic fibrosis (CF) patients colonized with Pseudomonas aeruginosa is challenging due to its virulence and multi-drug resistance. Ceftolozane/tazobactam (C/T) is a promising new antipseudomonal agent, and clinical data on CF are limited. We describe our experience in the use of C/T for P. aeruginosa-related pulmonary exacerbations (PE) in CF adults admitted within 2016 and 2019 at Careggi Hospital, Florence, Italy. PE was diagnosed as deterioration of respiratory function, worsening cough, and increasing of sputum. C/T was given at the dose of 3 g every 8 h. C/T was used in ten patients. Mean length of C/T treatment was 16.3 days, and tobramycin was the most frequently combined antipseudomonal agent. All patients were successfully treated although susceptibility testing on sputum sample showed C/T resistance in two cases. No adverse effects related to C/T were reported. To our knowledge this is the largest case series on CF patients treated with C/T. Clinical responses were encouraging even where C/T resistant P. aeruginosa was isolated, probably due to multiple phenotypes colonizing CF lungs. C/T could play a promising role in combination therapy against P. aeruginosa as a part of a colistin-sparing regime.
Assuntos
Antibacterianos/uso terapêutico , Cefalosporinas/uso terapêutico , Fibrose Cística/tratamento farmacológico , Pulmão/microbiologia , Infecções por Pseudomonas/tratamento farmacológico , Pseudomonas aeruginosa/efeitos dos fármacos , Tazobactam/uso terapêutico , Adolescente , Adulto , Fibrose Cística/microbiologia , Humanos , Itália , Masculino , Testes de Sensibilidade Microbiana , Pessoa de Meia-Idade , Infecções por Pseudomonas/microbiologia , Pseudomonas aeruginosa/genética , Pseudomonas aeruginosa/isolamento & purificação , Pseudomonas aeruginosa/fisiologia , Escarro/microbiologia , Adulto JovemRESUMO
Aim: The objective of this study was to investigate the possible synergy between doxycycline and photodynamic therapy against Helicobacter pylori and to evaluate the possible side effects on adenocarcinoma gastric cells with and without protoporphyrin IX. Materials & methods: Three H. pylori strains (ATCC 700392, 43504 and 49503) were grown on solid medium either with, or without, doxycycline at subinhibitory concentrations, and irradiated for 10, 20 and 30 minutes with a 400 nm-peaked light source. The phototoxicity tests on AGS cells were evaluated by MTT assay. Results: The photodynamic therapy and doxycycline combination showed an antibacterial synergistic effect with no significant toxicities. Conclusion: The synergistic treatment could be considered as an interesting therapeutic option.