Amoxicillin therapeutic drug monitoring for endocarditis: a comparative study (EI-STAB).
Int J Antimicrob Agents 2023;
62:106821. [PMID:
37088439 DOI:
10.1016/j.ijantimicag.2023.106821]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 04/12/2023] [Accepted: 04/17/2023] [Indexed: 04/25/2023]
Abstract
INTRODUCTION
International guidelines recommend high doses of beta-lactams for most infective endocarditis (IE). Therapeutic drug monitoring (TDM) is increasingly used to adjust the dose based on plasma concentrations, although no comparative study supports these practices. We aimed to evaluate the benefit of amoxicillin TDM during IE.
METHODS
An observational retrospective cohort study of all adults treated with high-dose amoxicillin for enterococcal or streptococcal IE was conducted in two referral centers. We compared patients with, or without TDM. The primary outcome was mean daily amoxicillin dose.
RESULTS
We enrolled 206 streptococcal (n=140, 68%) or enterococcal (n=66, 32%) IE, on native valve (n=129, 63%) or prosthetic valve (n=77, 37%). There were 154 men (75%), mean age was 70 ± 14 years, valvular surgery was performed in 81/206 (39%) patients, and in-hospital mortality was 8% (17/206). All patients in the TDM group and the vast majority of them in the other group received amoxicillin as continuous infusion. Amoxicillin TDM was performed for 114 patients (55.3%), with a mean of 4.7 +/- 2.3 measures per patient, a mean plasma steady-state concentration of 41.2 +/- 19 mg/L, most (82/114, 72%) being within the therapeutic target (20-80 mg/L). Mean amoxicillin dose was lower in patients with TDM (10.0 +/- 3.3 g/day vs 11.3 +/- 2.0 g/day in patients without TDM, P=0.003).
CONCLUSION
Amoxicillin TDM was associated with a reduction in daily doses, with no impact on adverse events and prognosis. Individualized treatment of IE through TDM may contribute to decreased use of antibiotics.
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