Appropriateness of antibiotic therapy on weekends versus weekdays.

OBJECTIVES To compare the appropriateness of antibiotic treatment prescribed in an emergency department (ED) of a tertiary medical centre on weekdays and weekends. METHODS During a 1 month period, medical charts of 1029 ED visits for patients who were discharged from the ED were reviewed. Data of patients who were discharged with antibiotics were blind evaluated by two infectious disease specialists, and an 'appropriateness score' was given to the antibiotic prescription. RESULTS Antibiotics were prescribed at discharge for 182 (17.7%) patients. Appropriate antibiotic treatment was administered significantly less frequently on weekends when compared with weekdays (P = 0.004). Appropriateness scores were higher for the surgical and urological wings (P = 0.011) and for diagnoses of pneumonia and urinary tract infection (P = 0.005). Time of the day and patient's age and sex did not have a significant effect on the appropriateness score. Adjusting for all variables, only weekends remained significantly associated with less appropriate antibiotic treatment, odds ratio 0.35 and 95% confidence intervals 0.16-0.78. CONCLUSIONS This study shows less appropriate antibiotic prescription in an ED on weekends than weekdays. More studies are required to clarify measures to improve appropriate antibiotic therapy at weekends.