The Role of Chest Ultrasound in Patients With Respiratory Tract Infections

Respiratory Tract Infections

Respiratory tract infections are a major cause of hospitalization among pediatric and adult patients, regardless of the cause, whether viral or bacterial. It is critical to stratify each patient's risk to predict the subsequent clinical course. Point-of-care chest ultrasonography in parallel with clinical evaluation has been found to be an effective tool to assess the severity of pathology. A number of scores have been validated on the basis of the ultrasound picture. Currently, a growing interest is directed toward the unambiguous validation of an ultrasound score that can predict the patient's outcome in terms of hospitalization, ICU admission, need for a more pronounced approach in terms of respiratory care both qualitatively and quantitatively.

Acute respiratory infections are the leading cause of illness and mortality in children under five, with children experiencing three to six episodes annually. This prevalence remains consistent across various demographics, although the severity of these infections differs significantly between high- and low-income countries. In developing nations, factors such as specific pathogens and risk factors contribute to higher mortality rates from these diseases. The most common respiratory infections in young children include pneumonia and bronchiolitis. Bronchiolitis, primarily caused by respiratory syncytial virus (RSV), is a significant viral infection affecting infants, particularly those under one year old, with peak incidence between three to six months. RSV affects 50-80% of bronchiolitis cases, while other viruses like rhinoviruses and influenza may also play roles. The American Academy of Pediatrics recommends a clinical diagnosis for bronchiolitis, reserving chest radiography for severe cases to exclude other conditions. Treatment is largely supportive, focusing on hydration and respiratory care, with only about 6% of cases requiring intensive care unit admission. Bacterial pneumonia is another major respiratory infection in children, often caused by Streptococcus pneumoniae or Haemophilus influenzae type b (Hib). Atypical pneumonias can arise from Mycoplasma pneumoniae and Chlamydia pneumoniae, particularly in older children. Current guidelines suggest that patients with uncomplicated community-acquired pneumonia do not require chest imaging or laboratory tests and can often be treated at home. Effective clinical assessment is crucial for stratifying risk in respiratory infections. Vital signs such as heart rate and respiratory rate, along with physical examination findings like wheezing or use of accessory muscles, help predict clinical outcomes. However, these assessments can be complicated by factors like fever or patient compliance issues. Recent studies have highlighted the utility of lung ultrasonography as a point-of-care tool for assessing various pulmonary conditions in pediatrics, correlating ultrasound patterns with disease severity. In pediatric acute respiratory distress syndrome (PARDS), a new definition has emerged that shifts focus from bilateral infiltrates to the saturation-to-inhaled oxygen fraction (S/F) ratio for assessing severity. An S/F ratio below 235 indicates moderate PARDS, while below 212 signifies severe PARDS. This approach enhances the evaluation of respiratory distress in children, providing a more practical method for predicting clinical outcomes based on easily obtainable parameters.

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