Beta-lactam Pharmacokinetics in Secondary Care
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT03033394|
Recruitment Status : Completed
First Posted : January 26, 2017
Results First Posted : August 30, 2021
Last Update Posted : August 30, 2021
|Condition or disease||Intervention/treatment|
|Pharmacokinetics Beta Lactam Adverse Reaction Penicillin Allergy||Drug: Beta-lactam antibiotic|
- Participants receiving oral or intravenous therapy will be included in this study.
- Drug level sampling will be undertaken once the participant is at steady state (after at least 5 doses have been administered to those on treatment).
- All patients will be consented using the participation information leaflet and consent form provided in appendix 1.
DRUG LEVEL SAMPLING
- Patients will be identified for inclusion, and researchers will discuss inclusion in the study with the patient and provide clinical information for them to consider. Individuals will be recruited from all areas of secondary care (including, general medicine, general surgery, augmented care, and out-patient parenteral antimicrobial therapy [OPAT]).
- They will then be consented by researchers after being given at least 24 hours to consider this information and as long as the patient has expressed interest in participating to their treating physician.
- This will include permission for basic, anonymised demographic and clinical data to be collected related to the patients infection, for which they are receiving antimicrobial therapy.
- An extra 3mLs of blood will be collected during the patient's routine daily phlebotomy round following their consent. They will be enrolled for up to 72 hours or two days of routine blood tests (whichever is shorter). Up to 10 samples may be taken during the 2 days the patient is enrolled, depending on the number of routine blood tests the patient receives during that day. No more than 3mLs will be taken per each routine blood sample. For example, if the individuals will only have routine blood tests taken at 8am on day 1 and day 2. Then only two extra samples will be taken (3mLs on D1 and 3mLs on D2).
- The time they received their dose of antimicrobials, the length of infusion time (if available), and time the sample was collected will all be recorded.
- PK/PD indices for evaluation will be calculated post-hoc during pharmacokinetic-pharmacodynamic analysis. TDM sampling can occur at any time during the dosing schedule (in line with routine blood testing).
- A standard operating procedure for this study can be found in appendix 3.
SAMPLE PREPARATION AND ANALYSIS
- All blood samples will be allowed to clot and placed on ice. They will be centrifuged at 2,400rpm for 10 minutes. Sera from each sample will be separated into three vials and stored at -80C.
- Beta-lactam concentrations will be measured using validated high-performance liquid chromatography methods.
Samples will be stored for up to three years post completion of data collection.
- Consent will be gained for samples to be used for calibration of electrochemical sensors in ex-vivo studies. This will be performed within 90 days of the samples being collected.
- Data will be anonymised and analysed using Pmetrics in R.
- Different pharmacokinetic models will be explored using in built statistical analysis options and visual predictive checks.
- Pharmacodynamic models will then be incorporated into the model using evidence identified in the literature for selection of parameters.
- Monte Carlo simulation will then be used to for simulation of target attainments and analysis of pharmacodynamic outcomes
|Study Type :||Observational|
|Actual Enrollment :||65 participants|
|Official Title:||Defining Adult Beta-lactam Antimicrobial Pharmacokinetics Across the Secondary Care Setting|
|Actual Study Start Date :||July 12, 2017|
|Actual Primary Completion Date :||August 1, 2019|
|Actual Study Completion Date :||August 1, 2019|
Observational pharmacokinetic study of non-critical care patients receiving beta-lactam antibiotics for management of infections.
Drug: Beta-lactam antibiotic
Routine clinical dosing
Other Name: Penicillin
- Fraction of the Dosing Interval Over Which the Concentration of Unbound Drug is Greater Than the Minimum Inhibitory Concentration (fT>MIC) [ Time Frame: Two to 10 samples taken during the first 120 hours of antimicrobial therapy ]Minimum inhibitory concentration (MIC) is the concentration required to visibly inhibit microbial growth in vitro. The MIC for each drug was defined by non-species related breakpoints provided in EUCAST v11.0. Results are given as a fraction of the dosing interval over which the concentration of the unbound drug is greater than the MIC.
Biospecimen Retention: Samples Without DNA
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03033394
|London, United Kingdom, W12 0HS|
|Principal Investigator:||Alison H Holmes, MD MPH MBBS||Health Protection Research Unit in HCAI & AMR|