Using this service model, OPAT is safe and clinically effective, with low rates of complications/readmissions and high levels of patient satisfaction. OPAT is cost-effective when compared with equivalent inpatient care in the UK healthcare setting.

Outpatient parenteral antimicrobial therapy (OPAT) has evolved relatively slowly in the UK. This study describes the OPAT service based in a large UK teaching hospital in Sheffield, and examines the clinical efficacy, patient acceptability and costs saved over a 10-year period. Data on 3812 episodes of OPAT administered between January 2006 and January 2016 were retrieved from a prospectively maintained electronic database. This study compared the real costs of the OPAT service with estimated costs of conventional inpatient care for these patient episodes, and analysed patient feedback questionnaires that were administered randomly between January 2014 and January 2015. A wide range of infections were managed during the 10-year period. Skin and soft tissue infections accounted for 57% of OPAT episodes. The total number of bed-days saved was 49,854. A successful outcome (cure or improvement) was found in 3357 (88%) episodes. Re-admission occurred in 265 (7%) episodes. The rates of healthcare-associated infections were low: 15 intravenous-line-related infections were recorded (0.3 per 1000 OPAT patient-days). Patient acceptance and satisfaction with OPAT were high. OPAT cost 15%, 39%, 40% and 44% of inpatient costs for an infectious diseases unit, national average costs, other departments (non-infectious diseases unit), and the minimum national average costs for each diagnostic category, respectively. This study shows that OPAT is safe, clinically efficacious and acceptable for treating a wide range of infections with high levels of patient satisfaction and substantial cost savings.

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This study demonstrated the benefits and limitations of the bioMérieux AES. Automated knowledge-based systems provide a useful laboratory tool for the interpretation of susceptibility results.

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