Abstract
Spondylodiscitis is a severe infectious disease of the vertebral column and the intervertebral disc space and may be complicated by an epidural abscess. A wide range of pathogens have been described as causative agents. Since several weeks of antibiotics are necessary for successful therapy detection of the causative pathogen is essential. Specific antibiotic therapy improves outcome and reduces antibiotic related complications. Antibiotic Stewardship (ABS) programs are bundled approaches aimed at improving antibiotic therapy. In 2012 an ABS program including weekly interdisciplinary clinical rounds and development of algorithms for diagnosis and therapy of patients with spondylodiscitis was established in the Department of Orthopedic Surgery in a University hospital. We evaluated the effects of ABS with regard to the appropriateness of specimen and pathogen detection and antibiotic therapy in patients with spondylodiscitis.
We retrospectively analysed diagnostic procedures and pathogen detection of 100 patients that were hospitalized with spondylodiscitis and compared the data of patients that were treated before (2004–2011) and after introduction of ABS measures (2012–2014). After introduction the effect of ABS on antibiotic therapy was analysed.
100 patients with radiologically confirmed spondylodiscits were enrolled. The pre-ABS group (2004–2011) contained 58 patients. Of these no samples were taken for microbiological examination from 21 patients (36%) and from 8 patients (14%) only swabs were submitted for culture. Aspirates or tissue samples were taken from 22 patients (38%) and blood cultures from 18 patients (31%). Pathogen detection was successful in 18 patients (31%).
After introduction of ABS in the beginning of 2012 aspirates or tissue samples were taken from 34 patients (81%) and blood cultures were taken from 34 patients (81%). Pathogen detection was successful in 26 patients (62%). The most commonly detected pathogens were Gram positive cocci (S.aureus, S. epidermidis, and streptococci) in 31 patients. Less common pathogens were found in 12 patients (Gram negative rods (8), fungi (3), Moraxella (1) and Propionibacterium (1). After introduction of ABS antibiotic therapy was changed in 18 of 20 patients (90%) after pathogen identification.
In 50 % of cases the inappropriate empiric therapy was changed (MRSA, MRSE and Gram negative rods) and in 50 % broad-spectrum antibiotic therapy could be deescalated.
ABS significantly improved the number and quality of samples, increased the number of blood cultures taken and doubled the pathogen detection rates in patients with spondylodiscitis leading to an improvement in antibiotic therapy in almost all patients with pathogen detection.
