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Infections due to gram-negative bacteria: an overview
Abstract:
Infections caused by gram-negative bacteria have continued to be a major problem for hospitalized patients. Malignant necrotizing otitis due to Pseudomonas aeruginosa has been encountered with increasing frequency as the number of older diabetic patients has increased. Nosocomial sinusitis and bacteremia due to Escherichia coli, Klebsiella pneumoniae, Enterobacter species, or P. aeruginosa develop in hospitalized patients. Bacteremia due to E. coli, K. pneumoniae, or P. aeruginosa often follows instrumentation of the urinary, respiratory, or gastrointestinal tracts in the hospitalized patient. Mortality still is excessively high. Infections of skin structure, particularly decubitus ulcers in debilitated, bedridden patients, are due to a mixed gram-negative and anaerobic flora; frequently, P. aeruginosa and Enterobacteriaceae resistant to many older agents are the major pathogens. Similarly, osteomyelitis in patients who have undergone previous surgical procedures is caused by various multiply resistant Enterobacteriaceae and P. aeruginosa. In all of these situations, therapy has usually included an aminoglycoside. The availability of drugs such as aztreonam, which has activity directed at aerobic gram-negative bacilli, provides an alternative approach that has proved successful and can be evaluated in more detail in the coming years.
Insights
Gram-negative bacterial infections pose significant risks to hospitalized patients, especially with increasing antibiotic resistance. Aztreonam offers a promising alternative therapy for these difficult-to-treat infections.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Gram-negative bacterial infections are a significant challenge in hospitalized patients.
- Increasing prevalence of infections caused by Pseudomonas aeruginosa and Enterobacteriaceae, often resistant to conventional therapies.
- Common infections include malignant necrotizing otitis, sinusitis, bacteremia, skin structure infections, and osteomyelitis.
Purpose of the Study:
- To highlight the challenges in treating gram-negative bacterial infections in hospitalized patients.
- To introduce aztreonam as a potential alternative therapeutic agent.
- To emphasize the need for further evaluation of aztreonam's efficacy.
Main Methods:
- Review of clinical cases and treatment outcomes for gram-negative infections.
- Analysis of pathogen prevalence, including Pseudomonas aeruginosa and resistant Enterobacteriaceae.
- Evaluation of therapeutic strategies, focusing on the role of aminoglycosides and aztreonam.
Main Results:
- Gram-negative bacteria, particularly P. aeruginosa and resistant Enterobacteriaceae, are major pathogens in various hospital-acquired infections.
- Aminoglycosides have been a mainstay therapy, but high mortality persists.
- Aztreonam demonstrates activity against aerobic gram-negative bacilli and presents a successful alternative approach.
Conclusions:
- Gram-negative bacterial infections remain a critical concern in healthcare settings.
- The emergence of multidrug-resistant organisms necessitates novel therapeutic options.
- Aztreonam shows promise as an effective treatment for aerobic gram-negative bacillary infections and warrants further investigation.