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Validation and Application of a Dried Blood Spot Assay for Biofilm-Active Antibiotics Commonly Used for Treatment of Prosthetic Implant Infections.

ABSTRACT: Dried blood spot (DBS) antibiotic assays can facilitate pharmacokinetic (PK)/pharmacodynamic (PD) studies in situations where venous blood sampling is logistically difficult. We sought to develop, validate, and apply a DBS assay for rifampin (RIF), fusidic acid (FUS), and ciprofloxacin (CIP). These antibiotics are considered active against organisms in biofilms and are therefore commonly used for the treatment of infections associated with prosthetic implants. A liquid chromatography-mass spectroscopy DBS assay was developed and validated, including red cell partitioning and thermal stability for each drug and the rifampin metabolite desacetyl rifampin (Des-RIF). Plasma and DBS concentrations in 10 healthy adults were compared, and the concentration-time profiles were incorporated into population PK models. The limits of quantification for RIF, Des-RIF, CIP, and FUS in DBS were 15 ?g/liter, 14 ?g/liter, 25 ?g/liter, and 153 ?g/liter, respectively. Adjusting for hematocrit, red cell partitioning, and relative recovery, DBS-predicted plasma concentrations were comparable to measured plasma concentrations for each antibiotic (r > 0.95; P < 0.0001), and Bland-Altman plots showed no significant bias. The final population PK estimates of clearance, volume of distribution, and time above threshold MICs for measured and DBS-predicted plasma concentrations were comparable. These drugs were stable in DBSs for at least 10 days at room temperature and 1 month at 4°C. The present DBS antibiotic assays are robust and can be used as surrogates for plasma concentrations to provide valid PK and PK/PD data in a variety of clinical situations, including therapeutic drug monitoring or studies of implant infections.

SUBMITTER: Knippenberg B

PROVIDER: S-EPMC4958200 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature

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Validation and Application of a Dried Blood Spot Assay for Biofilm-Active Antibiotics Commonly Used for Treatment of Prosthetic Implant Infections.

Knippenberg Ben B Page-Sharp Madhu M Salman Sam S Clark Ben B Dyer John J Batty Kevin T KT Davis Timothy M E TM Manning Laurens L

Antimicrobial agents and chemotherapy 20160722 8

Dried blood spot (DBS) antibiotic assays can facilitate pharmacokinetic (PK)/pharmacodynamic (PD) studies in situations where venous blood sampling is logistically difficult. We sought to develop, validate, and apply a DBS assay for rifampin (RIF), fusidic acid (FUS), and ciprofloxacin (CIP). These antibiotics are considered active against organisms in biofilms and are therefore commonly used for the treatment of infections associated with prosthetic implants. A liquid chromatography-mass spectr ...[more]

PMID: 27270283

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Project description:ObjectivesThe study aimed at identifying the commonly used non-prescribed antibiotics (NPAs) and the main health conditions leading to the practices of self-medication with antibiotics (SMAs) in Maputo city, Mozambique.DesignCross-sectional qualitative study based on individual and group interviews.SettingThe study was conducted in nine pharmacies of three socioeconomic areas of Maputo city, from October 2018 to March 2019.ParticipantsThe study included 32 pharmacy clients and 17 pharmacists. The pharmacy clients included men 10 (31%) and women 22 (69%) ranging from 19 to 67 years while the pharmacists included men 6 (35,3%) and women 11 (64,7%) with ages ranging from 24 to 47 years.FindingsThe majority of the pharmacy clients 30 (93.75%) admitted frequent use of NPAs, 15 (88.2%) out of the 17 pharmacists admitted dispensing NPAs. While the majority of the participants (16) mentioned the use of amoxicillin, also known as 'two colours medicine', 14 mentioned the use of cotrimoxazole and seven mentioned amoxicillin with clavulanic acid. Two to five participants also used tetracycline, ciprofloxacin, azithromycin, doxycycline, erythromycin, metronidazole and phenoxymethylpenicillin. The above mentioned NPAs were used to treat self-perceived sore throat, fever, pain, cough, vaginal discharge, eye problems, the common influenza, urinary infections, respiratory tract infections, wounds and toothaches.ConclusionsAntibiotics are perceived as essential medical resources to manage health and illnesses. While taking an active role in their health-disease process, participants commonly used amoxicillin, 'two colours', cotrimoxazole and amoxicillin with clavulanic acid to manage their health and that of their families. In this sense, the practices of SMAs were perceived as part of the self-care process and not necessarily as misuse of antibiotics. A wideunderstanding of health-seeking beliefs and behaviours regarding the utilisation of antibiotics is needed to inform public health experts, health policymakers and other stake-holders in designing and implementing public health education and health promotion programsat all levels in Mozambique.

Dataset Information

Validation and Application of a Dried Blood Spot Assay for Biofilm-Active Antibiotics Commonly Used for Treatment of Prosthetic Implant Infections.

Publications

Validation and Application of a Dried Blood Spot Assay for Biofilm-Active Antibiotics Commonly Used for Treatment of Prosthetic Implant Infections.

Similar Datasets

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