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Nussbaumer-Pröll AK, Eberl S, Schober C, Zeitlinger M. Impact of pH on the activity of novel cephalosporin cefiderocol in human urine. J Antimicrob Chemother 2024; 79:166-171. [PMID: 38000090 PMCID: PMC10761271 DOI: 10.1093/jac/dkad361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
BACKGROUND Antimicrobial activity of antibiotics can be impacted by pH, enhancing or reducing their bactericidal properties. Cefiderocol, a novel cephalosporin antibiotic that is among others indicated for the treatment of complicated urinary tract infections (cUTIs), lacks data on activity in urine. METHODS Pooled human urine (iron levels ∼0.05 mg/L/24 h), CAMHB and iron-depleted CAMHB (ID-CAMHB) at pH 5, 7 and 8 served as media. MIC testing was done according to EUCAST with the broth microdilution method for 17 clinical isolates of Escherichia coli and ATCC 25922 (including isolates with ESBL activity), 17 clinical isolates of Klebsiella pneumoniae and ATCC 700603 (also with ESBL), and 6 clinical isolates of Pseudomonas aeruginosa and ATCC 27853. Time-kill curves (TKCs) were performed for selected strains at pH 5, 7 and 8 in urine. RESULTS MIC values in urine, CAMHB and ID-CAMHB exhibited isolate-specific variations when assessed under identical pH conditions, ranging from a 1-fold dilution to changes of up to 4-fold dilutions in either direction. Median MICs of cefiderocol were up to 50-fold higher in pH 5 than in pH 7 for P. aeruginosa isolates and 32-fold higher in E. coli and K. pneumoniae isolates. TKCs with 650 and 1300 mg/L cefiderocol in urine showed that ATCC strains were efficiently eradicated despite the pH set. CONCLUSIONS Acidic pH had a significant negative impact on cefiderocol activity. Yet, after a recommended IV administration of 2 g cefiderocol every 8 h, a concentration of approximately 1300 mg/L can be achieved in urine, suggesting that efficient killing of all tested pathogens could have been possible even under acidic conditions in vivo.
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Affiliation(s)
| | - Sabine Eberl
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Christine Schober
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Markus Zeitlinger
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
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Rodríguez A, Moreno G, Bodi M, Martín-Loeches I. Antibiotics in development for multiresistant gram-negative bacilli. Med Intensiva 2022; 46:630-640. [PMID: 36302707 DOI: 10.1016/j.medine.2022.05.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 05/26/2022] [Indexed: 06/16/2023]
Abstract
The rapid increase in antibiotic(ATB) resistance among Gram-negative bacilli(BGN), especially in strains of Enterobacteriaceae, Pseudomonas aeruginosa, and Acinetobacter baumannii, with high resistance patterns (XDR), poses a huge threat to health systems worldwide. In the last decade, different ATBs have been developed against XDR, some of which combine a lactam β along with a β-lactamase inhibitor, while others use non-β-lactam inhibitors. Most of them have adequate "in vitro" activity on several β-lactamases of class A, C and D of Ambler. However, combinations such as Ceftazidime/avibactam, Ceftolozane/Tazobactam and Meropenem/vaborbactam have no activity against metallo-β-lactamases(MβL). New combinations such as Aztreonan/AVI, Cefepime/Zidebactam, or new cephalosporins such as Cefiderocol, have efficacy against MβL enzymes. Although some of these combinations are already approved and in the commercialization phase, many of them have yet to define their place within the treatment of microorganisms with high resistance through clinical studies.
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Affiliation(s)
- A Rodríguez
- Servicio de Medicina Intensiva, Hospital Universitario Joan XXIII, Tarragona, Spain; IISPV/CIBERES, Tarragona, Spain.
| | - G Moreno
- Servicio de Medicina Intensiva, Hospital Universitario Joan XXIII, Tarragona, Spain
| | - M Bodi
- Servicio de Medicina Intensiva, Hospital Universitario Joan XXIII, Tarragona, Spain; IISPV/CIBERES, Tarragona, Spain
| | - I Martín-Loeches
- Trinity College Dublin, School of Medicine, Intensive Care Medicine St James's Hospital, Dublín, Ireland
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Pascale R, Pasquini Z, Bartoletti M, Caiazzo L, Fornaro G, Bussini L, Volpato F, Marchionni E, Rinaldi M, Trapani F, Temperoni C, Gaibani P, Ambretti S, Barchiesi F, Viale P, Giannella M. Cefiderocol treatment for carbapenem-resistant Acinetobacter baumannii infection in the ICU during the COVID-19 pandemic: a multicentre cohort study. JAC Antimicrob Resist 2021; 3:dlab174. [PMID: 34806011 PMCID: PMC8599913 DOI: 10.1093/jacamr/dlab174] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 10/25/2021] [Indexed: 12/29/2022] Open
Abstract
Objectives To analyse the impact of cefiderocol use on outcome in patients admitted to the ICU for severe COVID-19 and further diagnosed with carbapenem-resistant Acinetobacter baumannii (CR-Ab) infection. Methods Retrospective multicentre observational study was performed at four Italian hospitals, from January 2020 to April 2021. Adult patients admitted to ICU for severe COVID-19 and further diagnosed with CR-Ab infections were enrolled. Patients treated with cefiderocol, as compassionate use, for at least 72 h were compared with those receiving alternative regimens. Primary endpoint was all-cause 28 day mortality. The impact of cefiderocol on mortality was evaluated by multivariable Cox regression model. Results In total, 107 patients were enrolled (76% male, median age 65 years). The median time from ICU admission to CR-Ab infection diagnosis was 14 (IQR 8–20) days, and the main types of CR-Ab infections were bloodstream infection (58%) and lower respiratory tract infection (41%). Cefiderocol was administered to 42 patients within a median of 2 (IQR 1–4) days after CR-Ab infection diagnosis and as monotherapy in all cases. The remaining patients received colistin, mostly (82%) administered as combination therapy. All-cause 28 day mortality rate was 57%, without differences between groups (cefiderocol 55% versus colistin 58% P = 0.70). In multivariable analysis, the independent risk factor for mortality was SOFA score (HR 1.24, 95% CI 1.15–1.38, P < 0.001). Cefiderocol was associated with a non-significant lower mortality risk (HR 0.64, 95% CI 0.38–1.08, P = 0.10). Conclusions Our study confirms the potential role of cefiderocol in the treatment of CR-Ab infection, but larger clinical studies are needed.
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Affiliation(s)
- Renato Pascale
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Zeno Pasquini
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Michele Bartoletti
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Luca Caiazzo
- Infectious Disease Unit, Azienda Ospedaliera Ospedali Riuniti Marche Nord, Pesaro, Italy
| | - Giacomo Fornaro
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Linda Bussini
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Francesca Volpato
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Elisa Marchionni
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Matteo Rinaldi
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Filippo Trapani
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Chiara Temperoni
- Infectious Disease Unit, Azienda Ospedaliera Ospedali Riuniti Marche Nord, Pesaro, Italy
| | - Paolo Gaibani
- Operative Unit of Microbiology, University of Bologna, Policlinico Sant'Orsola, Bologna, Italy
| | - Simone Ambretti
- Operative Unit of Microbiology, University of Bologna, Policlinico Sant'Orsola, Bologna, Italy
| | - Francesco Barchiesi
- Infectious Disease Unit, Azienda Ospedaliera Ospedali Riuniti Marche Nord, Pesaro, Italy.,Department of Scienze Biomediche e Sanità Pubblica, Università Politecnica delle Marche, Ancona, Italy
| | - Pierluigi Viale
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
| | - Maddalena Giannella
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola, Bologna, Italy
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