OPTIMIZATION OF PK/PD OF ANTIBIOTICS FOR RESISTANT GRAM-NEGATIVE ORGANISMS
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1 HTIDE CONFERENCE 2018 OPTIMIZATION OF PK/PD OF ANTIBIOTICS FOR RESISTANT GRAM-NEGATIVE ORGANISMS FEDERICO PEA INSTITUTE OF CLINICAL PHARMACOLOGY DEPARTMENT OF MEDICINE, UNIVERSITY OF UDINE, ITALY SANTA MARIA MISERICORDIA UNIVERSITY HOSPITAL UDINE, ITALY Mestre-Venice, October 25th-26th 2018
2 DEFINING ADEQUATE ANTIMICROBIAL THERAPY IN SEVERE INFECTIONS For antimicrobial therapy to be adequate, three requirements need to be fulfilled. First, the antimicrobial agent(s) should be initiated as soon as possible after the onset of sepsis. Second, as therapy is to be initiated empirically, the antimicrobial spectrum of the agent should be broad enough to cover the potential causative microorganisms. Finally, appropriate antimicrobial dosing is required to: maximize microbial killing, minimize the development of multidrug antimicrobial resistance, and avoid concentration-related adverse drug reactions. Blot S, Pea F, Lipman J. Adv Drug Deliv Rev 2014; 77: 3-11
3 DETERMINING B-LACTAM EXPOSURE THRESHOLD TO SUPPRESS RESISTANCE DEVELOPMENT IN GRAM-NEGATIVE BACTERIA Tam V et al. J Antimicrob Chemother 2017; 72: STUDY DESIGN Two strains of Klebsiella pneumoniae and two strains of Pseudomonas aeruginosa were examined Various dosing exposures of cefepime, ceftazidime and meropenem were simulated in the hollow-fibre infection model Serial samples were obtained to ascertain the pharmacokinetic simulations and viable bacterial burden for up to 120 h Resistance development was detected by quantitative culture on drug-supplemented media plates The Cmin/MIC breakpoint threshold to prevent bacterial regrowth was identified by classification and regression tree (CART) analysis Institute of Clinical Pharmacology - UniUD
4 DETERMINING B-LACTAM EXPOSURE THRESHOLD TO SUPPRESS RESISTANCE DEVELOPMENT IN GRAM-NEGATIVE BACTERIA Tam V et al. J Antimicrob Chemother 2017; 72: SUSCEPTIBILITY AND RESISTANCE MECHANISMS OF THE CLINICAL STRAINS USED TYPICAL SIMULATED PHARMACOKINETIC PROFILE OF 2 G MEROPENEM Q8H OVER 30 MIN CMIN MG/L Institute of Clinical Pharmacology - UniUD
5 DETERMINING B-LACTAM EXPOSURE THRESHOLD TO SUPPRESS RESISTANCE DEVELOPMENT IN GRAM-NEGATIVE BACTERIA Tam V et al. J Antimicrob Chemother 2017; 72: DRUG EXPOSURES (CMIN/MIC) STRATIFIED BY OUTCOMES 3.8 CMIN/MIC Institute of Clinical Pharmacology - UniUD
6 PHARMACOKINETIC AND PHARMACODYNAMIC PROPERTIES OF ANTIMICROBIAL AGENTS MDD EI-CI Blot S, Pea F, Lipman J. Adv Drug Deliv Rev 2014; 77: 3-11
7 Institute of Clinical Pharmacology - UniUD
8 CEFTAZIDIME / AVIBACTAM Institute of Clinical Pharmacology - UniUD
9 PK/PD TARGET ATTAINMENT ANALYSES TO DETERMINE OPTIMAL DOSING OF CEFTAZIDIME-AVIBACTAM FOR THE TREATMENT OF ACUTE PULMONARY EXACERBATIONS IN PATIENTS WITH CYSTIC FIBROSIS Bensman TJ et al. Antimicrob Agent Chemother 2017 Oct; 61: e CF STUDY PARTICIPANT DEMOGRAPHICS AND BASELINE CHARACTERISTICS
10 PK/PD TARGET ATTAINMENT ANALYSES TO DETERMINE OPTIMAL DOSING OF CEFTAZIDIME-AVIBACTAM FOR THE TREATMENT OF ACUTE PULMONARY EXACERBATIONS IN PATIENTS WITH CYSTIC FIBROSIS Bensman TJ et al. Antimicrob Agent Chemother 2017 Oct; 61: e CUMULATIVE RESPONSE PROBABILITY OF CEFTAZIDIME AVIBACTAM 2.5 G Q8H vs. P. aeruginosa CF ISOLATES
11 COLISTIN DOES NOT POTENTIATE CEFTAZIDIME-AVIBACTAM KILLING OF CRE in vitro OR SUPPRESS EMERGENCE OF CEFTAZIDIME-AVIBACTAM RESISTANCE Shields RK et al. Antimicrob Agents Chemother 2018 Jul 27;62(8). pii: e MOLECULAR CHARACTERISTICS, DRUG MICS, AND TIME-KILL RESULTS OF 24 CRE ISOLATES
12 COLISTIN DOES NOT POTENTIATE CEFTAZIDIME-AVIBACTAM KILLING OF CRE in vitro OR SUPPRESS EMERGENCE OF CEFTAZIDIME-AVIBACTAM RESISTANCE Shields RK et al. Antimicrob Agents Chemother 2018 Jul 27;62(8). pii: e MEAN LOG KILLS OF ALL 24 CRE ISOLATES ISOLATES AT CEFTAZIDIME-AVIBACTAM CONCENTRATIONS RANGING FROM 0.25 TO 4 x MIC. AVIBACTAM WAS FIXED AT 4 µg/ml IN ALL EXPERIMENTS
13 COLISTIN DOES NOT POTENTIATE CEFTAZIDIME-AVIBACTAM KILLING OF CRE in vitro OR SUPPRESS EMERGENCE OF CEFTAZIDIME-AVIBACTAM RESISTANCE Shields RK et al. Antimicrob Agents Chemother 2018 Jul 27;62(8). pii: e MEAN LOG KILLS OF ALL 24 CRE ISOLATES BY CEFTAZIDIME-AVIBACTAM (C-A, 4xMIC), 2 µg/ml COLISTIN ALONE, OR A COMBINATION OF BOTH AGENTS.
14 COLISTIN DOES NOT POTENTIATE CEFTAZIDIME-AVIBACTAM KILLING OF CRE in vitro OR SUPPRESS EMERGENCE OF CEFTAZIDIME-AVIBACTAM RESISTANCE Shields RK et al. Antimicrob Agents Chemother 2018 Jul 27;62(8). pii: e MOLECULAR CHARACTERISTICS, DRUG MICS, AND TIME-KILL RESULTS OF 24 CRE ISOLATES
15
16 RENAL DOSING OF ANTIBIOTICS: ARE WE JUMPING THE GUN? Crass RL et al. Clin Infect Dis 2018 Sep 13 online published ABSTRACT Ceftolozane/tazobactam, ceftazidime/avibactam, and telavancin all carry precautionary statements for reduced clinical response in patients with baseline ClCr ml/min, potentially due to unnecessary dose reduction in the setting of acute kidney injury (AKI). In this review, we discuss the regulatory landscape for antibiotics eliminated by the kidney and highlight the importance of the first 48 hours of therapy. Using a clinical database, we identify AKI on admission in a substantial proportion of patients with pneumonia (27.1%), intra-abdominal (19.5%), urinary tract (20.0%), or skin and skin structure infections (9.7%) that resolved by 48 hours in 57.2% of cases.
17 RENAL DOSING OF ANTIBIOTICS: ARE WE JUMPING THE GUN? Crass RL et al. Clin Infect Dis 2018 Sep 13 online published FRACTIONAL CHANGE IN SERUM CREATININE RELATIVE TO BASELINE THROUGH THE FIRST 4 DAYS OF ADMISSION. ALL PATIENTS, PATIENTS WITH TRANSIENT AKI PATIENTS WITH AKI ON ADMISSION, PATIENTS WITH PERSISTENT AKI
18 RENAL DOSING OF ANTIBIOTICS: ARE WE JUMPING THE GUN? Crass RL et al. Clin Infect Dis 2018 Sep 13 online published ABSTRACT. Ceftolozane/tazobactam, ceftazidime/avibactam, and telavancin all carry precautionary statements for reduced clinical response in patients with baseline ClCr ml/min, potentially due to unnecessary dose reduction in the setting of acute kidney injury (AKI). In this review, we discuss the regulatory landscape for antibiotics eliminated by the kidney and highlight the importance of the first 48 hours of therapy. Using a clinical database, we identify AKI on admission in a substantial proportion of patients with pneumonia (27.1%), intra-abdominal (19.5%), urinary tract (20.0%), or skin and skin structure infections (9.7%) that resolved by 48 hours in 57.2% of cases. We suggest that deferred renal dose reduction of wide therapeutic index antibiotics could improve outcomes in patients with infectious diseases.
19 CEFTOLOZANE / TAZOBACTAM Institute of Clinical Pharmacology - UniUD
20 DETERMINATION OF ALTERNATIVE CEFTOLOZANE/TAZOBACTAM DOSING REGIMENS FOR PATIENTS WITH INFECTIONS DUE TO P. aeruginosa WITH MIC VALUES BETWEEN 4 AND 32 MG/L Nastesan J et al. J Antimicrob Chemother 2017 Oct; 72(10): PTA BY CEFTOLOZANE/TAZOBACTAM DOSE, ESTIMATED RENAL FUNCTION CATEGORY AND CEFTOLOZANE/TAZOBACTAM MIC VALUE
21 EVIDENCE OF CLINICAL RESPONSE AND STABILITY OF CEFTOLOZANE/TAZOBACTAM USED TO TREAT A CARBAPENEM-RESISTANT P. aeruginosa LUNG ABSCESS ON AN OUTPATIENT ANTIMICROBIAL PROGRAM Stewart A et al. Int J Antimicrob Agents 2018 June; 51: CASE REPORT A 58-year-old male patient with a renal transplant was admitted to a tertiary referral hospital following subacute fevers. On admission, CT of his chest revealed a 4-cm cavitating lung lesion within the right upper lobe of the lung. A pan-susceptible P. aeruginosa was isolated via bronchoscopy and therapy was initiated with intravenous meropenem 1g q8h. The patient s clinical condition worsened, and he required inotropic support in ICU. He developed AKI with a SCr rise to 231 μmol/l from a baseline of 96 μmol/l. The patient was discharged to a medical ward and completed a total of 14 days of meropenem.
22 EVIDENCE OF CLINICAL RESPONSE AND STABILITY OF CEFTOLOZANE/TAZOBACTAM USED TO TREAT A CARBAPENEM-RESISTANT P. aeruginosa LUNG ABSCESS ON AN OUTPATIENT ANTIMICROBIAL PROGRAM Stewart A et al. Int J Antimicrob Agents 2018 June; 51: CASE REPORT Five days after cessation of antibiotic therapy the patient became febrile. Repeat imaging of his chest revealed progression of the cavitating lung abscess. An induced sputum sample revealed a P. aeruginosa isolate resistant to meropenem, ciprofloxacin and ceftazidime. Ceftolozane/Tazobactam MIC at ETest was 2 mg/l (susceptible) and the patient was administered a 3 g/1.5 g/24-h continuous C/T infusion. Following clinical and biochemical improvement (C-RP<2 mg/l), the patient was planned for discharge to his home via an OPAT service. Repeat imaging of his chest after 42 days of C/T therapy revealed a significant reduction in the cavitating lung lesion.
23 EVIDENCE OF CLINICAL RESPONSE AND STABILITY OF CEFTOLOZANE/TAZOBACTAM USED TO TREAT A CARBAPENEM-RESISTANT P. aeruginosa LUNG ABSCESS ON AN OUTPATIENT ANTIMICROBIAL PROGRAM Stewart A et al. Int J Antimicrob Agents 2018 June; 51: PHARMACOKINETIC STEADY STATE (AFTER 24 H OF CEFTOLOZANE CONTINUOUS INFUSION THERAPY), IN HOSPITAL IN COMMUNITY
24 EVIDENCE OF CLINICAL RESPONSE AND STABILITY OF CEFTOLOZANE/TAZOBACTAM USED TO TREAT A CARBAPENEM-RESISTANT P. aeruginosa LUNG ABSCESS ON AN OUTPATIENT ANTIMICROBIAL PROGRAM Stewart A et al. Int J Antimicrob Agents 2018 June; 51: CONCLUSIONS This is the first known report of C/T continuous infusion therapy used to treat a MDR P. aeruginosa pulmonary infection. C/T is known to be stable for at least 24 h at room temperature, which means it is a suitable candidate for continuous infusion. A study evaluating the stability of C/T in elastomeric pumps determined physical and chemical stability of at least 7 days with greater than 93% drug recovery at this time
25 EVIDENCE OF CLINICAL RESPONSE AND STABILITY OF CEFTOLOZANE/TAZOBACTAM USED TO TREAT A CARBAPENEM-RESISTANT P. aeruginosa LUNG ABSCESS ON AN OUTPATIENT ANTIMICROBIAL PROGRAM Stewart A et al. Int J Antimicrob Agents 2018 June; 51: CONCLUSIONS Recommended dosing of C/T in patients with a CLCr >50 ml/min is 1.5 g, over a 1-h infusion, q8h. The standard dose (3 g/1.5 g) was used in the patient in this report because he had a low body weight (approximately 65 kg), a CLCr of 55 ml/min and was not critically unwell at the time of treatment initiation. The unbound ceftolozane concentrations in plasma were well above the 4 5 times the MIC value that is associated with maximal bacterial killing. The mean penetration of ceftolozane into ELF is suggested to be 50% of plasma concentrations. Using this figure, the concentrations were likely to be greater than 4 5 times the MIC at the site of infection for the full dosing interval
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