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Pneumonia in the surgical intensive care unit: factors determining successful outcome
M A Malangoni1, R Crafton, F C Mocek
1Department of Surgery, University of Louisville School of Medicine, Kentucky.
Abstract:
A review of 85 consecutive patients who acquired pneumonia in a surgical intensive care unit revealed several parameters associated with successful treatment. Fifty-five patients (65%) recovered after a single course of antimicrobial therapy. Statistical analysis demonstrated significant differences between those treated successfully and those whose therapy failed during the duration of intubation (7.2 +/- 1.5 days versus 29.3 +/- 4.3 days), duration of ventilation (6.7 +/- 1.4 days versus 14.8 +/- 3.2 days), and the alveolar-arterial oxygen gradient on the day of diagnosis (215 +/- 23 mm Hg versus 343 +/- 33 mm Hg, all p < 0.01). Multiple antimicrobial resistance was uncommon in bacteria isolated on initial culture but occurred in two thirds of patients with treatment failures. Pneumonia due to Pseudomonas aeruginosa and Staphylococcus aureus were associated with the highest rate of treatment failure, which were 56% and 45%, respectively.
Insights
Successful surgical intensive care unit pneumonia treatment is linked to shorter intubation and ventilation durations, and lower alveolar-arterial oxygen gradients. Factors like antimicrobial resistance and specific pathogens (Pseudomonas aeruginosa, Staphylococcus aureus) impact outcomes.
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Pulmonology
Background:
- Hospital-acquired pneumonia (HAP) is a significant complication in surgical intensive care units (SICUs).
- Identifying predictors of successful antimicrobial therapy is crucial for optimizing patient outcomes.
Purpose of the Study:
- To identify clinical parameters associated with successful treatment of pneumonia in SICU patients.
- To analyze factors contributing to treatment failure in this patient population.
Main Methods:
- Retrospective review of 85 consecutive SICU patients diagnosed with pneumonia.
- Statistical analysis comparing patients with successful single-course antimicrobial therapy versus those with treatment failure.
- Assessment of duration of intubation, duration of ventilation, and alveolar-arterial oxygen gradient.
Main Results:
- 65% of patients recovered with a single course of antimicrobial therapy.
- Successful treatment was significantly associated with shorter intubation (7.2 vs 29.3 days) and ventilation durations (6.7 vs 14.8 days).
- Lower alveolar-arterial oxygen gradient (215 vs 343 mm Hg) on diagnosis day predicted successful outcomes.
Conclusions:
- Shorter intubation/ventilation and improved oxygenation predict successful pneumonia treatment in SICU.
- Antimicrobial resistance and specific pathogens like Pseudomonas aeruginosa and Staphylococcus aureus are linked to treatment failure.