Inter-expert agreement on indications for antibiotic therapy in older adults admitted to French hospital through an emergency department

Background: Around one third of older adults with infections have an atypical presentation upon admission to an emergency department (ED).

Objective: To evaluate the level of agreement between experts from several disciplines on the indication for antibiotic therapy for a bacterial infection in older patients presenting at an ED, and to describe the characteristics of the infections.

Methods: Based on comprehensive medical records, three experts (a geriatrician, an emergency physician (EP), and an infectious disease specialist (IDS)) determined independently and then jointly whether a patient presenting at the ED had a bacterial infection requiring antibiotic therapy. Inter-expert agreement was expressed as a fixed-marginal Fleiss' kappa (κ).

Results: Of the 444 medical records included, the consensus meeting found that 114 (25.7%) had an indication for antibiotics, 327 (73.6%) did not have an indication, and 3 could not be classified. The overall level of agreement was 85.2%, and κ[95%CI] was 0.64 [0.57-0.72] (p < 0.001). The level of agreement between the geriatrician and the IDS (89.41%, κ0.73, 95%CI [0.62-0.85] (p < 0.001)) was higher than that between the geriatrician and the EP (83.56%, κ0.62, 95%CI [0.51-0.73] (p < 0.001)) and between the IDS and the EP (82.66%, κ0.59, 95%CI [0.48-0.70] (p < 0.001)). The levels of agreement between the final adjudication, was higher for the geriatrician, and IDS respectively 94.1% (κ0.85, 95%CI [0.74-0.97] (p < 0.001) and 94.4% (κ0.86, 95%CI [0.74-0.97] (p < 0.001)). 114 (25.7%) patients had a bacterial infection (mostly lung infections (n = 55, 48.2%) and urinary tract infections (n = 25, 21.9%)), and 28 patients (6.3%) had a viral infection.

Conclusion: Our results highlighted substantial agreement between members of a multidisciplinary expert panel.