P29 A retrospective multi-centre review of antimicrobial usage in patients diagnosed with aspiration pneumonia

Abstract Background Over-diagnosis of infective aspiration pneumonia is common in healthcare settings and represents a potential for misuse of antimicrobial therapy. Methods A retrospective analysis was undertaken of all hospitalized patients treated for aspiration pneumonia within a multicentre Acute NHS Trust (April–May 2021, London, UK). Data collected included: age, initial antibiotics prescribed, duration of therapy, relevant microbiology (sputum samples or blood cultures) and chest X-ray. Treatment response was analysed including body temperature after 24 h of antimicrobials, use of oxygen support after 48 h, any escalation of antimicrobial therapy and 30 day in-hospital mortality. The study was registered as service evaluation project. Results In total, 94 patients treated for aspiration pneumonia were included; median age 82 years (IQR 67–89). Co-amoxiclav monotherapy was the most frequently prescribed treatment (67/94); cephalosporins (8/94) and ciprofloxacin (4/94) were also commonly used. Duration (median) of treatment was 4.4 days (IQR 1–6.7); 32/94 patients received