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Evaluation and simplification of the World Health Organization clinical case definition for paediatric AIDS
P Lepage1, P van de Perre, F Dabis
1Department of Paediatrics, Centre Hospitalier de Kigali, Rwanda.
Insights
The World Health Organization (WHO) clinical case definition for pediatric AIDS has low sensitivity and positive predictive value. A simplified definition using chronic diarrhea, respiratory distress, and generalized lymphadenopathy shows promise for better pediatric AIDS diagnosis in Africa.
Area of Science:
- Pediatric Infectious Diseases
- Epidemiology
- Clinical Diagnostics
Background:
- The World Health Organization (WHO) established a clinical case definition for pediatric AIDS.
- Accurate case definitions are crucial for epidemiological surveillance and patient management.
- Previous definitions may require refinement for specific populations and settings.
Purpose of the Study:
- To evaluate the sensitivity, specificity, and positive predictive value (PPV) of the WHO clinical case definition for pediatric AIDS in hospitalized children in Rwanda.
- To identify individual clinical signs and symptoms with high predictive value for pediatric AIDS.
- To develop and propose a simplified, more effective clinical case definition for pediatric AIDS in Africa.
Main Methods:
- A prospective study was conducted on 221 hospitalized children in Kigali, Rwanda.
- The WHO clinical case definition was applied, and additional clinical features were assessed.
- Logistic regression analysis was used to identify key predictive variables for HIV seropositivity.
Main Results:
- 15.4% of children were HIV seropositive.
- The WHO case definition demonstrated high specificity (92%) but low sensitivity (41%) and PPV (48%).
- Individual signs like generalized lymphadenopathy (88% PPV) and herpes zoster infection (100% PPV) showed high predictive value. Respiratory distress, chronic diarrhea, and generalized lymphadenopathy were significant predictors in logistic regression.
Conclusions:
- The WHO clinical case definition has limitations in sensitivity and PPV for pediatric AIDS in this setting.
- A simplified case definition incorporating key clinical signs like respiratory distress, chronic diarrhea, and generalized lymphadenopathy is proposed.
- Further research is needed to validate this simplified definition for epidemiological surveillance and clinical management of pediatric AIDS in Africa.
Abstract:
The World Health Organization (WHO) clinical case definition for paediatric AIDS was tested during a 1-month period on 221 consecutive hospitalized children in Kigali, Rwanda. Relevant clinical features not included in the WHO case definition were also evaluated. Thirty-four out of the 221 children (15.4%) were HIV seropositive. Although the specificity of the WHO case definition was high (92%), the sensitivity and the positive predictive value (PPV) were low (41 and 48%, respectively). The following individual signs had a PPV at least equal to the complete WHO case definition: chronic diarrhoea (47%), respiratory distress secondary to lower respiratory tract infection (50%), oral candidiasis (53%), parotitis (67%), generalized lymphadenopathy (88%), and herpes zoster infection (100%). When logistic regression analysis was done on the nine variables included in the WHO case definition, confirmed maternal infection was the best predictive variable for HIV seropositivity in children (P less than 10(-5). We further excluded the serological status of the mother from the analysis and performed a stepwise logistic regression analysis on the 18 clinical signs and symptoms for which information had been collected. Those signs and symptoms contributing the most to the regression were: respiratory distress, chronic diarrhoea and generalized lymphadenopathy. Based on these findings, we propose a simplified clinical case definition for paediatric AIDS in Africa with better sensitivity, specificity and PPV than the WHO case definition. Further work is needed using this approach to develop case definitions useful for epidemiological surveillance and for case management.