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Signs of severe bacterial infection in neonates
L Ronfani1, J N Vilarim, D Dragovich
1Department of Pediatrics, Istituto per l'Infanzia, Trieste, Italy.
Insights
Identifying severe bacterial infections (SBI) in newborns is crucial for reducing neonatal deaths. However, clinical signs alone are insufficient for accurate diagnosis in low-income settings, necessitating improved diagnostic approaches.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Public Health
Background:
- Severe bacterial infection (SBI) is a major cause of neonatal mortality, particularly in low-income countries.
- Effective case management guidelines are needed to improve outcomes for sick newborns.
Purpose of the Study:
- To identify a concise list of valid clinical signs for developing standard case management guidelines for SBI in neonates.
- To evaluate the diagnostic accuracy of reported and observed signs in identifying SBI in newborn infants.
Main Methods:
- Prospective observational study of 83 sick neonates admitted over 12 months.
- Classification of neonates into SBI (primarily pneumonia) and other diseases based on predefined criteria.
- Analysis of reported and observed clinical signs for sensitivity, specificity, and predictive values.
Main Results:
- No single sign demonstrated high sensitivity for detecting SBI; combined signs like severe chest indrawing, fast breathing, or 'not looking well' offered the best sensitivity (74%).
- For pneumonia diagnosis, reported difficult breathing and observed severe chest indrawing showed improved sensitivity (77%) and specificity (84%).
- Reported fever and 'not looking well' were the strongest independent predictors of SBI.
Conclusions:
- Clinical signs alone are inadequate for reliable identification of SBI in neonates at the primary healthcare level.
- Current standard case management guidelines based solely on clinical signs may miss a significant number of neonates with SBI.
- Further research is needed to enhance diagnostic accuracy and improve management strategies for neonatal infections in resource-limited settings.
Abstract:
The objective of this study was to identify a short list of valid signs for the development of standard case management guidelines for severe bacterial infection (SBI) in newborn infants, an important cause of neonatal deaths in low-income countries. The reported and observed signs of 83 sick neonates admitted during 12 consecutive months were recorded. At discharge, 50 cases were classified, using predefined criteria, as SBI, mostly pneumonia, and 33 as other disease. The neonates with other diseases were significantly younger than those with SBI. None of the reported and observed signs, when used alone, had a high sensitivity, an important feature for a severe disease amenable to effective treatment. The best sensitivity (74 per cent) was obtained when a doctor observed severe chest indrawing or fast breathing or 'not looking well'; the specificity was 67 per cent and the positive predictive value 77 per cent. The sensitivity of reported difficult breathing and of observed severe chest indrawing, when measured only for the diagnosis of pneumonia, improved to 77 per cent, with a specificity of 84 per cent and 66 per cent, respectively. Reported fever and the observation that the neonate was 'not looking well' were the best independent predictors of SBI on logistic regression analysis. Simple standard case management (SCM) guidelines based only on reported and observed clinical signs would not identify the majority of neonates with SBI at primary health care level.