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    Human hepatocyte growth factor levels in patients undergoing thoracic operations
    (European Respiratory Soc Journals Ltd, 2006) Dikmen, E.; Kara, M.; Kısa, Ü.; Atinkaya, C.; Han, S.; Sakinci, U.
    Human hepatocyte growth factor (hHGF) is the most potent mitogen identified for alveolar type II cells, and may have other important functions in the repair of the alveolar epithelium and compensatory lung growth. A study was conducted to evaluate the changes of serum hHGF levels in patients who underwent thoracic surgical procedures. The patients comprised 17 males and 14 females with a mean age of 47.1 +/- 13.5 yrs, who underwent either lung resection (LR group) or nonlung resection (norLR group) thoracic procedures. The changes of hHGF levels were analysed in the pre- and post-operative periods in both groups. The pre-operative hHGF levels did not differ between the LR and the nonLR groups, which were 333.2 +/- 72.9 pg center dot mL(-1) and 343.6 +/- 125.3 pg center dot mL(-1), respectively. The hHGF levels in the LR group significantly increased up to 433.6 +/- 128.1 pg center dot mL(-1) and 430.8 +/- 128.2 pg center dot mL(-1) in post-operative days 1 and 3, respectively. However, the same levels in the nonLR group appeared as 333.2 +/- 77.0 pg center dot mL(-1) and 311.9 +/- 73.0 pg center dot mL(-1), respectively. In conclusion, the increases of serum human hepatocyte growth factor levels following pulmonary resection may imply the important role of human hepatocyte growth factor in lung regeneration or compensatory lung growth in humans.
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    W-Plasty Technique in Tracheal Reconstruction: A New Technique?
    (Karger, 2008) Han, S.; Han, U.; Atinkaya, C.; Cavusoglu, T.; Osmanoglu, G.; Dikmen, E.
    Background: Tracheal stenosis and dehiscence of anastomosis due to excessive tension are well-known problems after long-segment tracheal resections. The aim of this study was to evaluate the efficacy of the W-plasty technique to prevent these two complications. Methods: Animals were divided into a study and a control group. Each group consisted of 6 animals. In the control group, we performed a 5-cm tracheal segment resection, and then reconstruction was performed with an interrupted technique with 6/0 Prolene sutures. In the study group, we used the W-plasty technique with 6/0 Prolene interrupted sutures. The animals were sacrificed on the 30th day postoperatively and tracheal resection including the entire anastomosis site was performed. The traction and pullout test was applied to each specimen and all the specimens were analysed histopathologically. The intraluminal diameter and the thickness of the tracheal wall at the level of anastomoses were measured by using a micrometer. The pattern of the reaction and localization were recorded. Results: The traction and pullout test results were 131.6 +/- 4.3 g and 187.5 +/- 6.4 g in the control and the study group, respectively, which was a significant difference (p = 0.004). The intraluminal diameters were 3.3 +/- 1.2 mm and 4.3 +/- 0.9 mm in the control and study group, respectively (p = 0.134). In contrast to the control group, early inflammatory and late fibroblastic reactions were negative in the study group. Conclusion: Considering the outcomes of this study, we think that the W-plasty technique has much more advantages than the standard techniques in terms of anastomosis durability and development of stenosis. Copyright (C) 2008 S. Karger AG, Basel