Related Experiment Videos
Pathophysiologic basis for the use of third-generation cephalosporins
1Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York 10032.
The American Journal of Medicine
|April 9, 1990
Summary
Third-generation cephalosporins offer excellent broad-spectrum antibiotic activity, particularly against Gram-negative bacteria. However, emerging resistance from specific bacteria threatens their continued efficacy, necessitating careful dosing strategies.
Area of Science:
- Pharmacology and Microbiology
- Antimicrobial Resistance
- Clinical Therapeutics
Background:
- Third-generation cephalosporins have demonstrated sustained excellent activity against a wide range of bacteria for a decade.
- They exhibit superior efficacy against specific streptococcal, Haemophilus, Neisseria, and Branhamella species compared to other cephalosporins.
- Despite broad-spectrum activity, they show limited effectiveness against enterococci, Listeria, Corynebacterium jekeium, and methicillin-resistant staphylococci.
Purpose of the Study:
- To evaluate the ongoing efficacy and spectrum of activity of third-generation cephalosporins after 10 years of clinical use.
- To identify emerging threats to the effectiveness of these antibiotics, including resistant bacterial strains.
- To correlate pharmacokinetic properties with in vitro activity to optimize dosage regimens for improved therapeutic outcomes.
Main Methods:
- In vitro susceptibility testing against a variety of bacterial pathogens.
- Review of clinical data and published literature on the use of third-generation cephalosporins over the past decade.
- Pharmacokinetic analysis to determine appropriate dosing based on drug properties and patient factors.
Main Results:
- Third-generation cephalosporins maintain excellent activity against Escherichia coli, Klebsiella, Proteus, Providencia, Serratia, Haemophilus, and Neisseria.
- Significant activity was also observed against anaerobic bacteria, including Bacteroides and Clostridium species.
- Emerging resistance is noted due to Enterobacter spp. producing beta-lactamase and Klebsiella spp. with new plasmid-mediated beta-lactamases.
Conclusions:
- Third-generation cephalosporins remain valuable antimicrobial agents due to their broad spectrum and sustained activity.
- The emergence of specific resistant strains, particularly Enterobacter and Klebsiella, poses a significant challenge to their continued use.
- Optimizing dosage regimens based on antibacterial activity and pharmacology is crucial for preserving the utility of these antibiotics.