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Predicting Short-Term Prognosis of Primary Spontaneous Pneumothorax Using Chest Radiographs
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A4216 - Predicting Short-Term Prognosis of Primary Spontaneous Pneumothorax Using Chest Radiographs
Author Block: K. Yoshimine1, K. Tobino2; 1Respiratory medicine, Iizuka Hospital, Iizuka City, Japan, 2Respiratory Medicine, Iizuka Hospital, Iizuka, Japan.
Rationale Expiratory chest X-rays are not thought to confer additional benefit in the routine assessment of pneumothorax. However, there is no study evaluating the ability of expiratory chest X-rays to predict prognosis of pneumothorax. The aim of this study is to investigate the utility of respiratory change of pneumothorax areas on chest X-ray for predicting the prognosis of primary spontaneous pneumothorax (PSP). Methods We retrospectively enrolled 64 patients with PSP (82 pneumothoraces) who underwent both expiratory and inspiratory chest X-rays at our hospital between April 2011 and May 2017. The difference of collapse rate between inspiratory and expiratory chest X-rays and inspiratory/expiratory ratio of pneumothorax area were measured using an image processing software Image J (http://imagej.nih.gov/ij/). We examined the utility of these quantitative measurements for predicting the third day outcome of the initial treatment of PSP. Results 68 male and 14 female pneumothoraces were included [median age was 19-year-old]. At day 3 after the initial treatment, 55 pneumothoraces improved and 27 pneumothoraces did not. Univariate analysis revealed significant differences between the improved and unimproved groups in “change of collapse rate (13.3±7.5 vs 9.4±4.0, p=0.02)” and “inspiratory/expiratory ratio of pneumothorax area (0.79±0.14 vs 0.85±0.11, p=0.04)”. There was no significant difference between the AUC on the “change of collapse rate” and “inspiratory/expiratory ratio of pneumothorax area” (0.657 vs 0.643, p=0.804). Conclusions Quantitative measurement of the change of collapse rate or pneumothorax area between inspiratory and expiratory chest X-rays may be useful in the prediction of the 3rd day outcome in the initial treatment of PSP.
Author Block: K. Yoshimine1, K. Tobino2; 1Respiratory medicine, Iizuka Hospital, Iizuka City, Japan, 2Respiratory Medicine, Iizuka Hospital, Iizuka, Japan.
Rationale Expiratory chest X-rays are not thought to confer additional benefit in the routine assessment of pneumothorax. However, there is no study evaluating the ability of expiratory chest X-rays to predict prognosis of pneumothorax. The aim of this study is to investigate the utility of respiratory change of pneumothorax areas on chest X-ray for predicting the prognosis of primary spontaneous pneumothorax (PSP). Methods We retrospectively enrolled 64 patients with PSP (82 pneumothoraces) who underwent both expiratory and inspiratory chest X-rays at our hospital between April 2011 and May 2017. The difference of collapse rate between inspiratory and expiratory chest X-rays and inspiratory/expiratory ratio of pneumothorax area were measured using an image processing software Image J (http://imagej.nih.gov/ij/). We examined the utility of these quantitative measurements for predicting the third day outcome of the initial treatment of PSP. Results 68 male and 14 female pneumothoraces were included [median age was 19-year-old]. At day 3 after the initial treatment, 55 pneumothoraces improved and 27 pneumothoraces did not. Univariate analysis revealed significant differences between the improved and unimproved groups in “change of collapse rate (13.3±7.5 vs 9.4±4.0, p=0.02)” and “inspiratory/expiratory ratio of pneumothorax area (0.79±0.14 vs 0.85±0.11, p=0.04)”. There was no significant difference between the AUC on the “change of collapse rate” and “inspiratory/expiratory ratio of pneumothorax area” (0.657 vs 0.643, p=0.804). Conclusions Quantitative measurement of the change of collapse rate or pneumothorax area between inspiratory and expiratory chest X-rays may be useful in the prediction of the 3rd day outcome in the initial treatment of PSP.
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