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Extended-spectrum (second- and third-generation) cephalosporins
1Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Texas Medical School, Houston.
Abstract:
The extended-spectrum cephalosporins provide better activity against gram-negative bacilli and anaerobes than first-generation agents. Cefoxitin and cefotetan (second-generation) and ceftriaxone (third-generation) have excellent activity against B. fragilis and are useful in the treatment of postoperative infections and pelvic inflammatory disease. The extended-spectrum cephalosporins are as efficacious as first-generation agents for prophylaxis of cesarean section and hysterectomy. The first-generation drugs, such as cefazolin, are considerably less expensive than these newer compounds, however, making first-generation agents the drugs of choice when used for prophylaxis. The majority of the third-generation agents should be reserved for the treatment of meningitis and resistant nosocomial infections.
Insights
Extended-spectrum cephalosporins offer enhanced activity against specific bacteria but are more expensive. First-generation cephalosporins remain cost-effective for surgical prophylaxis, while third-generation agents are best for resistant infections.
Area of Science:
- Pharmacology
- Infectious Diseases
- Antimicrobial Stewardship
Background:
- First-generation cephalosporins are cost-effective but have limited spectrum.
- Extended-spectrum cephalosporins (second- and third-generation) exhibit broader activity against Gram-negative bacilli and anaerobes.
- Specific agents like cefoxitin, cefotetan, and ceftriaxone show efficacy against *Bacteroides fragilis*.
Purpose of the Study:
- To compare the efficacy and cost-effectiveness of different cephalosporin generations.
- To guide the appropriate use of cephalosporins in surgical prophylaxis and treatment of infections.
- To inform antimicrobial stewardship by delineating optimal applications for each drug class.
Main Methods:
- Comparative analysis of antimicrobial activity spectra.
- Review of clinical efficacy data for surgical prophylaxis and treatment of specific infections.
- Cost-effectiveness evaluation of first-generation versus extended-spectrum cephalosporins.
Main Results:
- Extended-spectrum cephalosporins demonstrate superior activity against Gram-negative bacilli and anaerobes compared to first-generation agents.
- Second- and third-generation cephalosporins are effective for postoperative infections and pelvic inflammatory disease due to activity against *B. fragilis*.
- Extended-spectrum cephalosporins are as effective as first-generation agents for cesarean section and hysterectomy prophylaxis, but at a higher cost.
- First-generation cephalosporins are the preferred choice for prophylaxis due to lower cost.
- Third-generation cephalosporins are recommended for meningitis and resistant nosocomial infections.
Conclusions:
- First-generation cephalosporins are the most cost-effective option for surgical prophylaxis.
- Extended-spectrum cephalosporins offer advantages for treating specific infections like those involving *B. fragilis*.
- Judicious use of third-generation cephalosporins is essential for managing severe and resistant infections.