Abstract

Background: Chest radiograph has been the standard initial imaging modality of choice to
detect pneumothorax. Despite of moderate sensitivity in detection of pneumothorax, due to its
wide range of geographical availability and less expenditure in our country, it has been
widely advocated by all the physicians. Computed Tomography (CT) and Ultrasonography
(USG) being the current point of care in most parts of the country and having no radiation
risks, it can be utilized in early and safe detection of pneumothorax. In this study, we
analyzed the diagnostic utility and efficacy of chest ultrasound in detecting pneumothorax on
comparison to chest x ray.
Methods: Ethical committee clearance and informed consent was taken from all the patients.
Total of 79 patients who were having clinical suspicion of pneumothorax were evaluated.
Initial imaging evaluation was done using B-mode and M-mode chest ultrasonography and
further subjected to chest radiography. Images were assessed by 2 experienced radiologists.
Demographic, clinical and radiological data were documented and analyzed. In the cases of
discrepancy in findings of USG vs. Radiograph, CT was considered the gold standard for
obtaining the final diagnosis.
Results: We found that chest ultrasound had sensitivity of 98.43%, specificity of 100%, PPV
of 100%, NPV of 93.75% and diagnostic accuracy of 98.73%. Chest radiograph had
sensitivity of 73.43%, specificity of 83.33%, PPV of 94%, NPV of 46.9% and diagnostic
accuracy of 78.9%
Conclusion: Chest USG is a useful and essential tool in detection of pneumothorax.
Although chest radiograph being widely available and CT with its highest sensitivity &
specificity, USG stand apart in providing good diagnostic value with no radiation risks.