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Ultrasound imaging and use of B-lines for functional lung evaluation in neurocritical care: a prospective,
Federico Bilotta1, Luigi D Giudici, Ivan O Zeppa
1Section of Neuroanesthesia and Neurocritical Care, Department of Anesthesiology, Critical Care and Pain Medicine, Sapienza University of Rome, Rome, Italy. bilotta@tiscali.it
Context:
Lung ultrasound imaging can be used to evaluate pulmonary water content and pulmonary consolidation in ICU patients, but data from neurocritical care are lacking.
Objective:
To evaluate the utility of lung ultrasound to estimate the PaO2/FiO2 ratio and its diagnostic accuracy compared with chest radiograph and thoracic computed tomography (CT).
Design:
Prospective, observational study.
Setting:
University hospital neurocritical care unit.
Patients:
Forty-five consecutive patients.
Main Outcome Measures:
The relationship between the number of B-lines and the PaO2/FiO2 ratio as measure of lung water content, and the diagnosis of pulmonary consolidation.
Results:
Evaluation of lung water content as determined by the number of 'B-lines' has a linear relationship with the PaO2/FiO2 ratio (r = -0.8; P < 0.01). Lung ultrasound has a diagnostic accuracy similar to that of chest radiograph (99 vs. 96%), using thoracic CT as the reference technique.
Conclusion:
In neurocritical care, the use of lung ultrasound allows detection of increased lung water content when more than three 'B-lines' are present within the same lung field. This is associated with a reduction in PaO2/FiO2 ratio. Lung ultrasound can be used to diagnose pulmonary consolidation with an accuracy similar to the chest radiograph.
