When infective endocarditis is caused by a non-high-level aminoglycoside-resistant (non-HLAR) Enterococcus species with confirmed susceptibility to both beta-lactams and gentamicin, a targeted combination antibiotic approach is indicated. The protocol accounts for native valve endocarditis (NVE), prosthetic valve endocarditis (PVE), complicated NVE, and cases with prolonged symptom duration.
Infective endocarditis caused by non-HLAR Enterococcus spp., with organism susceptibility confirmed to beta-lactams and gentamicin. The choice of regimen and its duration is informed by valve involvement and the clinical course at presentation.
Management is built around a combination beta-lactam-based intravenous antibiotic regimen. Two distinct combination strategies are supported by evidence for this susceptibility profile, with the appropriate pairing and duration determined by whether NVE, PVE, or a complicated or prolonged presentation is involved.
Complete drug selection, dosing, route, duration, and decision logic are in the full protocol.
After 10–14 days of intravenous therapy, clinical stability permitting de-escalation to outpatient antibiotic therapy (OPAT or oral) is the target. Success criteria: fever resolved for more than 2 consecutive days, CRP below 20 mg/L (or below 25% of the maximum measured value), and leukocyte count below 15 × 10⁹/L.
DOI: 10.1093/eurheartj/ehad193
In patients with NVE due to non-HLAR Enterococcus spp., the combination of ampicillin or amoxicillin with ceftriaxone for 6 weeks or with gentamicin for 2 weeks is recommended using the following doses:
In patients with PVE and patients with complicated NVE or >3 months of symptoms due to non-HLAR Enterococcus spp., the combination of ampicillin or amoxicillin with ceftriaxone for 6 weeks or with gentamicin for 2 weeks is recommended using the following doses:
After 10–14 days of therapy, OPAT or outpatient oral antibiotic therapy should be considered if the patient is clinically stable (see Section 7.13).
Satisfying response to treatment: no fever >2 days, CRP <25% of max measured value or <20 mg/L and leukocytes <15 x 10⁹/L
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