الفهرس 
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Abstract
Summarizing our study, it included 112 patients divided into two equal groups; group I included 56 patients with small sized (24-26 Fr) tube thoracostomy and group II included 56 patients with large sized (30-32 Fr) tube thoracostomy, Mean age of patients in group I was 32.46, while that of group II was 36.04. The two groups showed a male dominance, group I by 92.9%, while group II by 87.5% regarding the male to female ratio. Regarding the mode of trauma; 40 (71.4%) patients had blunt chest trauma in group I and 16 (28.6%) patients had penetrating chest trauma, while in group II blunt and penetrating trauma were 35 (62.5%) and 21 (37.5%) patients respectively.Only chest trauma was recorded in 24 (42.9%) patients in group I and 29 (51.8%) patients in group II, while polytrauma was recorded in 32 (57.1%) patients in group I and 27 (48.2%) patients in group II In group I the effect of trauma was hemothorax in 10 (17.9%) patients, pneumothorax in 23 (41.1%)patients and combined hemo-penumothorax in 23 (41.1%) patients. In group II the effect of trauma was hemothorax in 12 (21.4%) patients, pneumothorax in 20 (35.7%) patients and combined hemo-penumothorax in 24 (42.9%) patients. Regarding the pain score; the mean value in group I was 4.32 ± 1.43 SDWhile in group II was 6.37 ± 1.27 SD (P-value 0.000). Mean days of inserted tube in group I was 4.23 ± 1.85 SD, while in group II was 4.50 ± 1.88 SD (P-value 0.449) Fully lung expansion was achieved in 49(87.5%) patients in group I and 48(85.7%) patients in group II. Residual collection was found in 4(7.1%) patients in group I and 1(1.8%) patient in group II. Clotted hemothorax was found in 3(5.4%) patients in group I and 4(7.1%) patients in group II. Lung dropping was not found in group I and was found in 3(5.4%) patients in group II. Tube repositioning was needed in 9 (16.1%) patients in group I and 11 (19.6%) patients in group II. Tube replacement was needed in 9 (16.1%) patients in group I and 9 (16.1%) patients in group II. Three (5.4%) patients in group I needed thoracotomy, while 4 (7.1%) patients in group II.