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A new scoring system for the clinical diagnosis of catheter-related infections
S Lugauer1, A Regenfus, M Böswald
1Klinik mit Poliklinik für Kinder und Jugendliche, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany.
Insights
Diagnosing catheter-related infections is challenging. A new scoring system, modifying Hospital Infection Control Practices Advisory Committee (HICPAC) definitions, improves quantitative grading and sensitivity for systemic infections.
Area of Science:
- Infectious Diseases
- Clinical Microbiology
- Healthcare Epidemiology
Background:
- Clinical diagnosis of catheter-related infections (CRIs) is difficult using current Hospital Infection Control Practices Advisory Committee (HICPAC) definitions from the Centers for Disease Control (CDC).
- Existing diagnostic criteria for nosocomial infections may lack sensitivity in definitively attributing systemic infections to catheters.
Purpose of the Study:
- To develop and evaluate a modified scoring system for quantitatively grading the causal relationship between catheters and systemic infections.
- To enhance the diagnostic accuracy for catheter-associated infections compared to existing criteria.
Main Methods:
- A modified scoring system was developed, incorporating criteria such as temperature changes, shivering, pathogen identification in blood/catheter cultures, clinical improvement post-catheter removal, exit site inflammation, and exclusion of other infection sources.
- Criteria were assigned points weighted by specificity.
- The scoring system was evaluated by comparing its results with HICPAC diagnostic criteria in 65 episodes of systemic infections.
Main Results:
- The modified scoring system demonstrated 85% agreement with HICPAC diagnostic criteria.
- No false-negative cases were identified, indicating high sensitivity.
- In nine out of ten false-positive cases, additional findings supported a catheter-associated infection, suggesting improved specificity in practice.
Conclusions:
- The developed scoring system offers a more sensitive method for diagnosing catheter-related systemic infections than current HICPAC criteria.
- This quantitative approach aids in establishing a causal link between catheters and infection episodes.
- The system shows promise for improved clinical diagnosis of catheter-associated infections without compromising specificity.
Abstract:
It is difficult to make the clinical diagnosis of catheter-related infections using the available and established definitions of the HICPAC (Hospital Infection Control Practices Advisory Committee) of the CDC (Centers for Disease Control, definitions of nosocomial infections). The scoring system shown here is a modification of these definitions and has enabled the causal relationship between the catheter and clinical episodes of systemic infections to be quantitatively graded. The scoring system included the following criteria: height and rate of rise of body temperature, attendant shivering, identification of pathogens in blood and/or catheter tip cultures, improvement in the clinical course after catheter removal, signs of catheter exit site inflammation and results of diagnostic tests for other possible sources of infection. These criteria were graded using points and weighted according to their specificity. The comparative evaluation of 65 episodes of systemic infections using the scoring system and the diagnostic criteria of HICPAC showed agreement in 85%. No case was graded "false-negative." In nine of ten false-positive cases additional findings supported the presence of a catheter-associated infection. This scoring system appears, therefore, to be more sensitive than existing diagnostic criteria, without loss of specificity.