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Updated: Mar 27, 2026

Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
Published on: August 30, 2018
Individualized antibiotic strategies
Fabio S Taccone1, Ottavia Bond, Federica Z Cavicchi
1aDepartment of Intensive Care bDepartment of Infectious Diseases, Hôpital Erasme, Université Libre de Bruxelles (ULB), Brussels, Belgium.
Purpose Of Review:
Infections are common complications in critically ill patients and are frequently treated with antibiotics. Unfortunately, delivery of optimal therapy is complicated because efficacy of antimicrobials is influenced by the timing of treatment initiation, the use of combination therapy, and the optimization of drug dosing.
Recent Findings:
Early diagnosis of infection is mandatory to provide a rapid and appropriate antibiotic therapy. The presence of less susceptible strains, in particular for hospital-acquired infections, or patients with severe disease, such as the presence of septic shock, may need combination antibiotic therapy. Antibiotic pharmacokinetics, notably volume of distribution and total body clearance, are significantly altered in these critically ill patients and can influence the attainment of adequate circulating levels when standard dosage regimens are administered. Higher dosing should be considered in such patients, although in case of renal impairment and reduced clearance, drug accumulation could also result in some side-effects. Nebulized antibiotics may provide a better clinical response than systemic antibiotics in ventilator-associated pneumonia because of multidrug-resistant pathogens.
Summary:
The optimal use of antibiotics in the management of severe infections is an important challenge for ICU physicians. Antimicrobial therapy needs to be individualized according to specific patient characteristics, infecting organisms, and susceptibility patterns.
Insights
Optimizing antibiotic therapy for critically ill patients requires careful consideration of treatment timing, drug combinations, and dosing. Individualizing antimicrobial strategies based on patient factors and pathogen susceptibility is crucial for effective infection management.
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Pharmacology
Background:
- Infections are frequent in critically ill patients, necessitating antibiotic treatment.
- Antibiotic efficacy is influenced by timing, combination therapy, and dosing strategies.
- Optimal antimicrobial delivery is challenging due to altered pharmacokinetics in critical illness.
Purpose of the Study:
- To review the complexities of antibiotic therapy in critically ill patients.
- To highlight factors influencing antimicrobial efficacy and patient outcomes.
- To emphasize the need for individualized treatment approaches.
Main Methods:
- Review of current literature on antibiotic use in intensive care units (ICUs).
- Analysis of factors affecting antimicrobial pharmacokinetics and pharmacodynamics in critical illness.
- Evaluation of diagnostic and therapeutic strategies for severe infections.
Main Results:
- Early infection diagnosis is essential for prompt and effective antibiotic therapy.
- Combination therapy may be required for resistant strains or severe conditions like septic shock.
- Altered pharmacokinetics in critically ill patients necessitate higher or adjusted antibiotic doses.
- Nebulized antibiotics show promise for ventilator-associated pneumonia with multidrug-resistant pathogens.
Conclusions:
- Individualizing antibiotic therapy is paramount for managing severe infections in ICUs.
- Treatment decisions must consider patient specifics, infecting organisms, and susceptibility.
- Optimizing antimicrobial use remains a significant challenge for ICU physicians.
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