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Management of infants at risk for occult bacteremia: a decision analysis
S M Downs1, R A McNutt, P A Margolis
1Department of Pediatrics, University of North Carolina, Chapel Hill 27599-7105.
Insights
Empiric antibiotic treatment is recommended for febrile infants lacking a clear bacterial infection source. This approach, despite minor quality-adjusted life expectancy differences, significantly prevents severe outcomes like death or disability in young children.
Area of Science:
- Pediatrics
- Infectious Diseases
- Decision Analysis
Background:
- Febrile infants without an obvious infection source may have occult bacteremia.
- Diagnosing bacteremia clinically in infants is challenging.
- Current diagnostic methods lack sufficient sensitivity for reliable clinical decision-making.
Purpose of the Study:
- To evaluate optimal management strategies for febrile infants at risk for bacteremia.
- To compare empiric antibiotic treatment, further testing, and observation.
- To inform clinical practice regarding the management of occult bacteremia in infants.
Main Methods:
- Decision analysis using a simple decision tree model.
- Evaluation of quality-adjusted life expectancy for different management strategies.
- Sensitivity analysis to determine thresholds for treatment efficacy and bacteremia prevalence.
Main Results:
- Empiric antibiotic treatment was identified as the optimal management strategy.
- The difference in quality-adjusted life expectancy between best and worst decisions was minimal (11 days).
- Empiric treatment prevented death or disability in 60 per 100,000 infants, remaining optimal unless bacteremia probability was <1.4% or treatment efficacy <21%.
Conclusions:
- Empiric antibiotic treatment and blood culture are recommended for infants at risk for occult bacteremia.
- Current diagnostic tests are insufficient to justify withholding empiric treatment.
- Large-scale controlled trials are needed to definitively compare treatment versus no treatment, but empiric therapy is advised in their absence.
Abstract:
Because febrile infants with no obvious source of bacterial infection may have bacteremia, and because bacteremia is difficult to diagnose on clinical grounds, we used decision analysis to evaluate whether such infants should be treated with antibiotics, tested further, or sent home. Using a simple decision tree, we found that the decision to give empiric antibiotic treatment is the decision of choice. The difference in quality-adjusted life expectancy between the "best" and "worst" decisions was only 11 days. However, this difference translated to prevention of death or permanent disability in 60 cases per 100,000 febrile children. Further, empiric treatment remained the best management alternative unless the probability of bacteremia was less than 1.4% (less than any published prevalence), or the efficacy of treatment was less than 21%. Our analysis demonstrated that a test with far greater sensitivity than leukocyte count or other tests currently in use is needed to justify testing rather than treating empirically. Further, an enormous patient population would be needed to find a difference of both clinical and statistical significance between treated and untreated patients in a controlled trial. In the absence of such trials, we recommend blood culture and empiric antibiotic treatment of all infants at risk for occult bacteremia.