LUNG CONTUSION VOLUME: DO YOU REALLY KNOW?
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Date
2023
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Abstract
Objective Pulmonary contusion is one of the most common complication of blunt chest trauma. It is sometimes very difficult for a physician to determine the extent and real amount of pulmonary contusion. The aim of the study was to measure the accurate pulmonary contusion volume on computed tomography images by using the manual planimetry method with the Cavalieri principle. Material and Method The study was performed on 76 patients who were admitted to the Emergency Medicine Clinic with lung contusion. Patient data were retrospectively screened and computed-tomography images of patients with lung contusion were examined to calculate lung contusion volume. After measurement in all lung sections, lung contusion volume was calculated in 6-8-10 sections by systemic randomized sampling. The volume of the contusion was calculated by two independent observers using the manual planimetry method. Results The mean volume of contusion obtained from all cross-section measurements was 34.23 ± 17.56%. In 6 sections measurement, contusion volume was 27.98±15.05%, in 8 sections 30.66±16.07% and in 10 sections 32.47±16.97%. When we examined the Bland Altman graphs, it is seen that the mean difference obtained from the 10 sections is smaller than the 6 and 8 sections measurements and the confidence interval is narrower. Therefore, we can say that the 10 sections measurement gives the closest evaluation to all lung contusion measurements with about 95% accuracy ratio. Conclusion Lung contusion volume can be objectively evaluated using the manual planimetry method with systematic random sampling without whole lung area measurement on CT with high interobserver and intraobserver agreement.