目的:通过动物实验探讨A型肉毒毒素注射后额部扩张皮瓣的生物力学性能的变化规律,以期为临床应用提供理论依据。方法:选用白色实验小型猪,在其胸腹部两侧用作网格样标记,一侧注射A型肉毒毒素,对侧注射生理盐水对照,两侧置入200ml扩张器...目的:通过动物实验探讨A型肉毒毒素注射后额部扩张皮瓣的生物力学性能的变化规律,以期为临床应用提供理论依据。方法:选用白色实验小型猪,在其胸腹部两侧用作网格样标记,一侧注射A型肉毒毒素,对侧注射生理盐水对照,两侧置入200ml扩张器,注水完成后切取全层扩张皮瓣作为试件,在I ns t r on4302万能材料试验机上对皮瓣试件进行应力-应变、应力松弛和蠕变实验。结果:实验组皮瓣的粘弹性比对照组的好,更接近于未扩张皮瓣;在同样的松弛时间内,实验组皮瓣比对照组更容易松弛;在相同的应力作用下,相同的时间内,实验组皮瓣的蠕变量要小于对照组。结论:注射A型肉毒毒素后,可以使扩张皮瓣的粘弹性增强,更接近于未扩张皮瓣,扩张器注水量增加,注水间隔缩短,在相同注水量下扩张面积增加。展开更多
Background: Although diabetes mellitus is known to induce many pathophysiological changes in the skin, none of the earlier studies has focused on the state of the stratum corneum (SC) in patients with diabetes. In our...Background: Although diabetes mellitus is known to induce many pathophysiological changes in the skin, none of the earlier studies has focused on the state of the stratum corneum (SC) in patients with diabetes. In our previous report on a diabetic mouse model, we described a decreased SC hydration state and abnormalities in the function of the sebaceous gland together with a normally retained barrier function of the SC. Objectives: To examine the functional changes of the SC in patients with diabetes. Methods: The following values were measured in 49 patients with diabetes: fasting plasma glucose (FPG) and haemoglobin A1c (HbA1c); skin surface lipid level on the forehead; and high-frequency conductance (HFC) and transepidermal water loss (TEWL) of the SC of the volar forearm and extensor surface of the lower leg. These functions of the SC were compared in two pairs of patient groups, i.e. between groups with high and low FPG, and between groups with high and low HbA1c. Results: The HFC levels on the extensor leg and volar forearm were significantly lower in the group with high FPG (FPG > 110 mg dL-1) than in the group with low FPG (FPG < 110 mg dL-1), although TEWL values were almost the same in these two groups. The skin surface lipids on the forehead were significantly lower in the former than in the latter. The HFC did not differ significantly between the group with high HbA1c (HbA1c > 5.8%) and the group with low HbA1c (HbA1c<5.8%), whereas the TEWL of the volar forearm was slightly lower in the former than in the latter. Conclusions: These new results as well as our earlier results with diabetic mice suggest that patients with diabetes mellitus tend to show a reduced hydration state of the SC together with decreased sebaceous gland activity, without any impairment of the SC barrier function.展开更多
文摘目的:通过动物实验探讨A型肉毒毒素注射后额部扩张皮瓣的生物力学性能的变化规律,以期为临床应用提供理论依据。方法:选用白色实验小型猪,在其胸腹部两侧用作网格样标记,一侧注射A型肉毒毒素,对侧注射生理盐水对照,两侧置入200ml扩张器,注水完成后切取全层扩张皮瓣作为试件,在I ns t r on4302万能材料试验机上对皮瓣试件进行应力-应变、应力松弛和蠕变实验。结果:实验组皮瓣的粘弹性比对照组的好,更接近于未扩张皮瓣;在同样的松弛时间内,实验组皮瓣比对照组更容易松弛;在相同的应力作用下,相同的时间内,实验组皮瓣的蠕变量要小于对照组。结论:注射A型肉毒毒素后,可以使扩张皮瓣的粘弹性增强,更接近于未扩张皮瓣,扩张器注水量增加,注水间隔缩短,在相同注水量下扩张面积增加。
文摘Background: Although diabetes mellitus is known to induce many pathophysiological changes in the skin, none of the earlier studies has focused on the state of the stratum corneum (SC) in patients with diabetes. In our previous report on a diabetic mouse model, we described a decreased SC hydration state and abnormalities in the function of the sebaceous gland together with a normally retained barrier function of the SC. Objectives: To examine the functional changes of the SC in patients with diabetes. Methods: The following values were measured in 49 patients with diabetes: fasting plasma glucose (FPG) and haemoglobin A1c (HbA1c); skin surface lipid level on the forehead; and high-frequency conductance (HFC) and transepidermal water loss (TEWL) of the SC of the volar forearm and extensor surface of the lower leg. These functions of the SC were compared in two pairs of patient groups, i.e. between groups with high and low FPG, and between groups with high and low HbA1c. Results: The HFC levels on the extensor leg and volar forearm were significantly lower in the group with high FPG (FPG > 110 mg dL-1) than in the group with low FPG (FPG < 110 mg dL-1), although TEWL values were almost the same in these two groups. The skin surface lipids on the forehead were significantly lower in the former than in the latter. The HFC did not differ significantly between the group with high HbA1c (HbA1c > 5.8%) and the group with low HbA1c (HbA1c<5.8%), whereas the TEWL of the volar forearm was slightly lower in the former than in the latter. Conclusions: These new results as well as our earlier results with diabetic mice suggest that patients with diabetes mellitus tend to show a reduced hydration state of the SC together with decreased sebaceous gland activity, without any impairment of the SC barrier function.
