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Treatment of pyelonephritis in adults
1Department of Microbiology, Laval University, Québec, Canada.
Abstract:
Although prescribing an antibiotic for the treatment of pyelonephritis seems to be a relatively easy task, a close look at the available data is disturbing. Optimal therapies for the different clinical syndromes of pyelonephritis have not yet been defined. The high failure rate suggests that in pyelonephritis (bacteria protected in the medulla) as well as in bacterial endocarditis (bacteria sequestered in vegetations) and in infections in neutropenic patients (host defenses not necessarily operating in conjunction with antibiotics), it may be necessary to maintain bactericidal levels at the site of infection (infected medulla) to achieve cure. Pharmacodynamic studies suggest that TMP/SMX, quinolones, and aminoglycosides, which penetrate well the infected renal parenchyma and are not impaired by the local inflammatory process, should, with the exception of pyelonephritis in pregnancy, be preferred to beta-lactams as first-choice agents for the therapy of gram-negative pyelonephritis.
Insights
Optimal antibiotic therapy for pyelonephritis remains undefined. For gram-negative pyelonephritis, agents like trimethoprim/sulfamethoxazole (TMP/SMX), quinolones, and aminoglycosides are preferred over beta-lactams due to better penetration and efficacy.
Area of Science:
- Infectious Diseases
- Pharmacology
- Nephrology
Background:
- Pyelonephritis treatment requires effective antibiotic penetration to the infected renal medulla.
- High treatment failure rates suggest current therapies may be suboptimal.
- Bacterial sequestration in infected tissues necessitates sustained bactericidal drug levels for cure.
Purpose of the Study:
- To review optimal antibiotic strategies for pyelonephritis.
- To identify first-choice antibiotic agents for gram-negative pyelonephritis.
- To compare the efficacy of different antibiotic classes in pyelonephritis treatment.
Main Methods:
- Review of pharmacodynamic studies and clinical data on pyelonephritis treatment.
- Analysis of antibiotic penetration into renal parenchyma.
- Evaluation of treatment outcomes based on antibiotic class.
Main Results:
- Optimal therapies for pyelonephritis syndromes are not well-defined.
- Antibiotics like trimethoprim/sulfamethoxazole (TMP/SMX), quinolones, and aminoglycosides demonstrate good renal penetration.
- These agents are suggested as preferred first-line treatments over beta-lactams for gram-negative pyelonephritis, except in pregnancy.
Conclusions:
- Achieving bactericidal antibiotic levels at the infection site is crucial for pyelonephritis cure.
- TMP/SMX, quinolones, and aminoglycosides are recommended as first-choice agents for gram-negative pyelonephritis.
- Beta-lactams may be less effective due to factors like impaired penetration or local inflammatory processes.