Objective: We have used therapeutic drug monitoring (TDM) analysis software to set the initial dose of vancomycin in our hospital.  In contrast, the TDM guideline, in which the initial dose of vancomycin per body weight was set, was published in 2012.  We looked forward with utilizing the TDM guideline in the clinical setting, after which we conducted multiple surveys to determine the important points of the TDM guideline.
Methods: We surveyed patients treated with vancomycin, in whom the initial dose was set using the TDM analysis software and the concordance rate between the vancomycin dose set with the software and that set with the TDM guideline.
Results: The concordance rate of vancomycin dose was 42.1%.  The mean age of the high-dose group (vancomycin dose higher than that recommended by the TDM guideline), was younger than that of the recommended-dose group.  Additionally, the mean body weight of the high-dose group was significantly lower than that of the recommended-dose group.  The corrected creatinine clearance of the low-dose group was significantly lower than that of the recommended-dose group.
Conclusion: Our results suggest that when the initial dose is set after referring the TDM guideline in patients who are not very high age, and having low body weight and decreased renal function, the dose may differ from the dose set by using TDM analysis software.  In addition, since the recommended dose per body weight is a range and not a single value, setting the dose appropriate to target trough concentration is necessary.

Objective: Antibiogram preparation is important for the proper selection of antimicrobial agent in empiric therapy. It is recommended to prepare the antibiogram separately for inpatients and outpatients. However, the antimicrobial agent susceptibility of bacteria detected from an inpatient is thought to be different when detected at an early date after admission and after a certain period after admission.Methods: In this study, we defined the bacteria detected from an inpatient within 3 days after admission as “brought bacteria” and those over 3 days after admission as “bacteria detected after admission.” Antimicrobial agent susceptibilities of brought bacteria and bacteria detected after admission in our hospital between April 2018 and March 2019 were compared for Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa.Results: The occurrence rate of Escherichia coli producing an extended β-lactamase of bacteria detected after admission was found to be significantly higher compared with that of brought bacteria. The sulbactam/ampicillin susceptibility rate of bacteria detected after admission was significantly lower than that of brought bacteria. The occurrence rate of the two drug-resistant Pseudomonas aeruginosa detected after admission tends to be higher compared with that of brought bacteria.Conclusion: Our findings showed that the susceptibility rate of some drugs differed substantially between brought bacteria and bacteria detected after admission. Therefore, the inpatient’s antibiogram is thought to be prepared by separating bacteria detected at an early date after admission and after a certain period after admission, leading to the proper selection of antimicrobial agent in empiric therapy tailored to a patient’s number of days in the hospital.