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  • Title: Safety and Efficacy of Ceftazidime-Avibactam Plus Metronidazole in the Treatment of Children ≥3 Months to <18 Years With Complicated Intra-Abdominal Infection: Results From a Phase 2, Randomized, Controlled Trial.
    Author: Bradley JS, Broadhurst H, Cheng K, Mendez M, Newell P, Prchlik M, Stone GG, Talley AK, Tawadrous M, Wajsbrot D, Yates K, Zuzova A, Gardner A.
    Journal: Pediatr Infect Dis J; 2019 Aug; 38(8):816-824. PubMed ID: 31306396.
    Abstract:
    BACKGROUND: Ceftazidime-avibactam plus metronidazole is effective in the treatment of complicated intra-abdominal infection (cIAI) in adults. This single-blind, randomized, multicenter, phase 2 study (NCT02475733) evaluated the safety, efficacy and pharmacokinetics of ceftazidime-avibactam plus metronidazole in children with cIAI. METHODS: Hospitalized children (≥3 months to <18 years) with cIAI were randomized 3:1 to receive intravenous ceftazidime-avibactam plus metronidazole, or meropenem, for a minimum of 72 hours (9 doses), with optional switch to oral therapy thereafter for a total treatment duration of 7-15 days. Safety and tolerability were assessed throughout the study, along with clinical and microbiologic outcomes, and pharmacokinetics. A blinded observer determined adverse event (AE) causality, and clinical outcomes up to the late follow-up visit. RESULTS: Eighty-three children were randomized and received study drug (61 ceftazidime-avibactam plus metronidazole and 22 meropenem); most (90.4%) had a diagnosis of appendicitis. Predominant Gram-negative baseline pathogens were Escherichia coli (79.7%) and Pseudomonas aeruginosa (33.3%); 2 E. coli isolates were ceftazidime-non-susceptible. AEs occurred in 52.5% and 59.1% of patients in the ceftazidime-avibactam plus metronidazole and meropenem groups, respectively. Serious AEs occurred in 8.2% and 4.5% of patients, respectively; none was considered drug related. No deaths occurred. Favorable clinical/microbiologic responses were observed in ≥90% of patients in both treatment groups at end-of-intravenous treatment and test-of-cure visits. CONCLUSIONS: Ceftazidime-avibactam plus metronidazole was well tolerated, with a safety profile similar to ceftazidime alone, and appeared effective in pediatric patients with cIAI due to Gram-negative pathogens, including ceftazidime-non-susceptible strains.
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