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Clinical predictors of hypoxaemia in children with pneumonia
Insights
Identifying hypoxemia in young children with acute lower respiratory infection is crucial. Raised respiratory rate in infants and auscultatory findings in older children can predict hypoxemia and risk of death.
Area of Science:
- Pediatrics
- Infectious Diseases
- Public Health
Background:
- Acute lower respiratory infection (ALRI) is a leading cause of mortality in children under five.
- Hypoxemia is a critical indicator of severity and risk of death in pediatric ALRI.
- Accurate identification of hypoxemic children is essential for timely intervention.
Purpose of the Study:
- To identify clinical factors predicting hypoxemia in children under five with ALRI.
- To assess the risk factors for mortality among these children.
- To inform and potentially refine clinical guidelines for ALRI management.
Main Methods:
- Prospective observational study conducted over 9 months in rural Zambia.
- Inclusion of 158 children under five admitted with ALRI.
- Data collection on clinical signs, oxygen saturation, nutritional status, and outcomes (hypoxemia, death).
Main Results:
- 35% of children were hypoxemic; 14.6% died.
- In children <1 year, respiratory rate >70 predicted hypoxemia (sensitivity 63%, specificity 89%).
- In children >1 year, crepitations/bronchial breathing predicted hypoxemia (sensitivity 75%, specificity 57%).
- Low oxygen saturation and poor nutrition increased the likelihood of death.
Conclusions:
- WHO guidelines using raised respiratory rate may effectively identify hypoxemic infants (<1 year).
- Auscultatory findings may be needed to identify hypoxemia in older children.
- Hypoxemia and malnutrition are significant risk factors for mortality in pediatric ALRI.
Abstract:
A prospective study to determine which clinical factors identified children with acute lower respiratory infection who were hypoxaemic and at risk of death was done over a 9-month period on children under 5 years of age admitted to a district hospital in rural Zambia. Of 158 children studied, 55 (35%) were found to be hypoxaemic and 23 (14.6%) died. For the subgroup of children under 1 year of age, a respiratory rate of > 70 was the only significant predictor of hypoxaemia (p < 0.001, sensitivity 63%, specificity 89%). In older children, only the presence of crepitations/bronchial breathing was predictive (p = 0.018, sensitivity 75%, specificity 57%). The likelihood of death was increased in those children with low oxygen saturation (p = 0.021) and poor nutrition (p = 0.007). It is concluded that, on the basis of raised respiratory rate, the WHO guidelines are likely to identify children under 1 year of age who are hypoxaemic. However, it may be necessary to include auscultatory findings in the guidelines to recognize hypoxaemia in older children in order to ensure that they receive appropriate treatment with oxygen. This study demonstrates that hypoxaemia and malnutrition are risk factors for death.