Pneumothorax Clinical Trial
Official title:
Accuracy of Lung Ultrasound in the Prediction of Pneumothorax Volume Assessed by CT Scan
Background
- Assessment of the percentage of lung collapse is crucial in the therapeutic
decision-making of pneumothorax.
- The methods normally used to this purpose are radiological. Computerized tomography
scan (CT) is highly accurate because it allows the exact evaluation of the volume of
the air layer. However, in clinical practice assessment of the volume of pneumothorax
mainly relies on the measurement of the inter-pleural distance at conventional chest
radiography (CXR). This latter method is inaccurate.
- Lung ultrasound is a new method highly accurate in the first diagnosis of pneumothorax,
with a sensitivity superior to CXR and similar to CT in case of traumatic pneumothorax.
- The scientific community is actually debating about the usefulness of lung ultrasound
in the quantification of pneumothorax []. Lung ultrasound can assess the superficial
extension of the pneumothorax, but cannot evaluate its volume.
Aim
- Main purpose of the study is to compare measurement of the superficial extension of
pneumothorax on the chest wall obtained by lung ultrasound, to the evaluation of the
air volume performed by CT in patients with pneumothorax.
- The main hypothesis of the study is that the cut-off between small (<11% of lung
collapse) and large (>11% of lung collapse) pneumothorax can be identified by a lung
ultrasound evaluation of the superficial extension of pneumothorax.
- Second purpose of the study is to compare the accuracies of lung ultrasound and CXR in
predicting the volume of pneumothorax assessed by CT.
- Secondary hypothesis is that lung ultrasound demonstrates greater accuracy in the
prediction of volume of pneumothorax and percentage of lung collapse.
Methods
- Patients with a diagnosis of pneumothorax confirmed at CT are prospectively enrolled
and submitted to lung ultrasound within 20 min from the CT study.
- Different locations of the sonographic "lung point" on the chest wall (i.e. the point
on the chest wall where the sonographic pattern of the normally aerated lung alternates
with the pathologic sonographic pattern of pneumothorax) are compared with different
volumes of pneumothorax measured by CT.
n/a
Observational Model: Case-Only, Time Perspective: Prospective
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