antibiotic dosing
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Author(s):  
N. D. Bunyatyan ◽  
V. I. Petrov ◽  
O. V. Shatalova ◽  
A. V. Ponomareva ◽  
A. Yu. Ryazanova ◽  
...  

Infectious process is an important cause of morbidity and mortality among patients with chronic kidney disease. Prescription of antibacterial drugs should take into account the pharmacokinetic parameters of the medicine and the individual characteristics of the patient. Adequate antibiotic dosing is crucial for positive treatment outcome and minimisation of side effects. The aim of the study was to analyse scientific literature on factors affecting the dosing of antibacterials in patients with chronic kidney disease. Since most antibacterial medicines are eliminated by the kidneys, a decrease in glomerular filtration rate or kidney function should be followed by the dose adjustment in order to prevent the medicine accumulation and reduce the risk of side effects. Antibiotic dosing in such patients should be accompanied by kidney function assessment and be adjusted to ensure effective and safe treatment, as well as prevention of bacterial resistance. The review provides data on the dosing of some antibiotic groups (beta-lactams, aminoglycosides, fluoroquinolones) at different creatinine clearance rates. Extrarenal excretion of medicines does not usually require the dose adjustment in patients with chronic kidney disease.


2021 ◽  
Vol 8 (Supplement_1) ◽  
pp. S578-S578
Author(s):  
Jessica Kennedy ◽  
Pranisha Gautam-Goyal ◽  
Robin V Koshy ◽  
Thien-Ly Doan ◽  
Neha Paralkar ◽  
...  

Abstract Background Antibiotic stewardship continues to be health concern that physicians often acknowledge, but whose real-life practices do not reflect that awareness. There is a wide range of opinions on the efficacy of the type of modality that is most effective to teach stewardship. Our project addresses resident needs specifically, with coverage in four topics—proper antibiotic dosing, IV to PO transitioning, duplicate coverage, and antibiotic time outs. Methods Categorical Internal Medicine residents in PGY 1-3 were sent an optional 48-question Likert survey querying needs in the above four topics. Results General Demographics. Resident response was 35%, with equal representation from all PGY years. Over half reported no ID or stewardship elective exposure and 74% agreed they could benefit from further education on stewardship (Figure 1). Proper Dosing Educational Needs. Of residents, 68% reported feeling confident about where to find information on dosing antibiotics for a given condition/organism (Figure 2a), but only 37% were comfortable with establishing an initial dose. When a range was suggested, 55% of respondents admitted to at least “sometimes, often, or always” choosing the highest suggested dose by default. IV to PO transition. Residents preferred (76%) and used (89%) IV antibiotics by default in an inpatient setting. Nearly 45% of respondents reported “sometimes or rarely” feeling comfortable in making an IV to PO transition, and 40% “often or always” avoid PO transition until discharge (Figure 2b). Duplicate Coverage. Over 70% of residents reported they “sometimes, rarely, or never” felt confident in stopping double coverage themselves when started by the primary team (Figure 3a). Antibiotic Time Out. Only 17% of respondents had heard of an antibiotic timeout, and only 8% have ever used one (Fig.3b); 80% of residents had no structured way to review usage and 53% reported “sometimes or often” forgetting about assessing for de-escalation daily. Figure 1. Resident Demographics Our anonymous, optional survey attracted a 35% response rate from the categorical residents at our suburban program spread over two tertiary hospitals with >1200 beds total. Most had not received prior training in infectious disease or stewardship, yet most recognized antibiotic overuse and resistance as a major, ongoing problem. Figure 2. Resident responses on proper dosing and IV to PO questions. (A) Residents appear most uncomfortable with initial antibiotic dosing and seeking additional sources for best dosage when commonly used sources suggest a range of possible doses. (B) Majority of residents preferred and used IV antibiotics, and commonly transitioned to PO only at patient discharge. Some residents reported discomfort with establishing equivalent IV to PO transition dosages. Figure 3. Resident responses to questions regarding duplication of therapy and antibiotic time outs. (A) Though many could and had recognized duplication of therapy on the wards, several participants reported at least some discomfort in independently stopping double coverage. (B) Most residents had not heard of or utilized an antibiotic time-out or any other structured method to re-assess their antibiotic use on daily rounds. As such, 41% of respondents admitted they would likely just continue initial, broad-spectrum therapy. Conclusion Our analysis aimed to establish resident educational needs in four major topics in stewardship. Gaps in knowledge include timing transition from IV to PO, initial antibiotic dosing, stopping double-coverage, and lack of awareness of timeouts. This needs assessment will be used to build an antibiotic stewardship curriculum for IM residents. Disclosures All Authors: No reported disclosures


2021 ◽  
Vol 11 (10) ◽  
pp. 1112-1120
Author(s):  
Kathryn E. Kyler ◽  
Brian R. Lee ◽  
Earl F. Glynn ◽  
Joel P. Waddell ◽  
Mark A. Hoffman ◽  
...  

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0252223
Author(s):  
Michelle N. Clements ◽  
Neal Russell ◽  
Julia A. Bielicki ◽  
Sally Ellis ◽  
Silke Gastine ◽  
...  

Background Paediatric global antibiotic guidelines are inconsistent, most likely due to the limited pharmacokinetic and efficacy data in this population. We investigated factors underlying variation in antibiotic dosing using data from five global point prevalence surveys. Methods & findings Data from 3,367 doses of the 16 most frequent intravenous antibiotics administered to children 1 month–12 years across 23 countries were analysed. For each antibiotic, we identified standard doses given as either weight-based doses (in mg/kg/day) or fixed daily doses (in mg/day), and investigated the pattern of dosing using each strategy. Factors underlying observed variation in weight-based doses were investigated using linear mixed effects models. Weight-based dosing (in mg/kg/day) clustered around a small number of peaks, and all antibiotics had 1–3 standard weight-based doses used in 5%-48% of doses. Dosing strategy was more often weight-based than fixed daily dosing for all antibiotics apart from teicoplanin, which had approximately equal proportions of dosing attributable to each strategy. No strong consistent patterns emerged to explain the historical variation in actual weight-based doses used apart from higher dosing seen in central nervous system infections, and lower in skin and soft tissue infections compared to lower respiratory tract infections. Higher dosing was noted in the Americas compared to the European region. Conclusions Antibiotic dosing in children clusters around a small number of doses, although variation remains. There is a clear opportunity for the clinical, scientific and public health communities to consolidate behind a consistent set of global antibiotic dosing guidelines to harmonise current practice and prioritise future research.


Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 615
Author(s):  
Johanna Seeger ◽  
Sebastian Guenther ◽  
Katharina Schaufler ◽  
Stefan E. Heiden ◽  
Robin Michelet ◽  
...  

Minimal inhibitory concentration-based pharmacokinetic/pharmacodynamic (PK/PD) indices are commonly applied to antibiotic dosing optimisation, but their informative value is limited, as they do not account for bacterial growth dynamics over time. We aimed to comprehensively characterise the exposure–effect relationship of levofloxacin against Escherichia coli and quantify strain-specific characteristics applying novel PK/PD parameters. In vitro infection model experiments were leveraged to explore the exposure–effect relationship of three clinical Escherichia coli isolates, harbouring different genomic fluoroquinolone resistance mechanisms, under constant levofloxacin concentrations or human concentration–time profiles (≤76 h). As an exposure metric, the ‘cumulative area under the levofloxacin–concentration time curve’ was determined. The antibiotic effect was assessed as the ‘cumulative area between the growth control and the bacterial-killing and -regrowth curve’. PK/PD modelling was applied to characterise the exposure–effect relationship and derive novel PK/PD parameters. A sigmoidal Emax model with an inhibition term best characterised the exposure–effect relationship and allowed for discrimination between two isolates sharing the same MIC value. Strain- and exposure-pattern-dependent differences were captured by the PK/PD parameters and elucidated the contribution of phenotypic adaptation to bacterial regrowth. The novel exposure and effect metrics and derived PK/PD parameters allowed for comprehensive characterisation of the isolates and could be applied to overcome the limitations of the MIC in clinical antibiotic dosing decisions, drug research and preclinical development.


Antibiotics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 169 ◽  
Author(s):  
Stephen Little ◽  
Andrew Woodward ◽  
Glenn Browning ◽  
Helen Billman-Jacobe

Pigs reared on many farms are mass-medicated for short periods with antibiotics through their drinking water to control bacterial pathogen loads and, if a disease outbreak occurs, to treat pigs until clinical signs are eliminated. Farm managers are responsible for conducting in-water antibiotic dosing events, but little is known about their dosing practices. We surveyed managers of 25 medium to large single-site and multi-site pig farming enterprises across eastern and southern Australia, using a mixed methods approach (online questionnaire followed by a one-on-one semi-structured interview). We found wide variation in the antibiotics administered, the choice and use of dosing equipment, the methods for performing dosing calculations and preparing antibiotic stock solutions, the commencement time and duration of each daily dosing event, and the frequency of administration of metaphylaxis. Farm managers lacked data on pigs’ daily water usage patterns and wastage and the understanding of pharmacology and population pharmacometrics necessary to optimize in-water dosing calculations and regimens and control major sources of between-animal variability in systemic exposure of pigs to antibiotics. There is considerable scope to increase the effectiveness of in-water dosing and reduce antibiotic use (and cost) on pig farms by providing farm managers with measurement systems, technical guidelines, and training programs.


Author(s):  
Silke Gastine ◽  
Yingfen Hsia ◽  
Michelle Clements ◽  
Charlotte IS Barker ◽  
Julia Bielicki ◽  
...  

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