湿布取样法测量组织扩张后皮肤表面积

Measurement of skin area over tissue expander by wet-cloth sampling

目的:湿布取样结合数码图像测量软件,探讨一种组织扩张后皮肤表面积的测量方法。方法:实验于2005-09/2006-01在北京大学第三医院成形科和北京积水潭医院烧伤整形科完成。①在扩张器周围,描记待测轮廓。②使用湿润样布紧密贴附于待测轮廓皮肤表面取样,多余部分直接剪去或折叠后描记折叠线。③数码相机采集平面样布及预制的标准参照卡片数据后,传输至电脑。④图像测量软件测量、计算面积。⑤标准4kg铅球,分别以软尺测量其大圆周长及湿布取样法测量其表面积;评估湿布取样法的测量误差。⑥额外皮肤扩张面积测量:在待测轮廓周围,描记规则的矩形或梯形,测量其边长和高,计算其面积作为扩张器置入前局部皮肤表面积;重复步骤②～④,湿布法测量实际面积;计算两者的差值记为皮肤额外扩张面积。⑦试计算不同部位扩张器注水量和″额外″扩张面积之比。结果:①采用湿布取样法重复测量的扩张器表面皮肤面积和铅球表面积,其变异系数均小于2%。②与软尺测量大圆周长计算的铅球表面积比较,湿布取样法的测量误差为1.53%。③测量的5个不同部位和容量的扩张器注水量(mL)和“额外”扩张面积(cm2)之比为1.53～5.44。结论:湿布取样法测量组织扩张后皮肤表面积,方法简便、准确、可靠,易于推广。

AIM： To find a practical method to measure area of skin over tissue expander by wet-cloth sampling and digital imaging software. METHODS： The experiment was conducted in Department of Plastic Surgery, Peking University Third Hospital, and Department of Burn and Plastic Surgery, Beijing Jishuitan Hospital from September 2005 to January 2006. ①The counter of the tissue expander on the skin was marked. ②A piece of wet sampling cloth was close-fitted on skin of the area. The redundant area was cut or marked after folding. ③Information of the cloth and prefab reference card statistics were collected by digital camera, and transferred to computer. ④The marked skin area was measured and calculated by digital image analyzing software. ⑤A shot of 4 kg was selected to measure its surface area by wet-cloth sampling method after calculated the largest circle. Measurement error of wetcloth sampling method was evaluated. ⑥Measurement of increased skin area： A rectangle or trapezoid was designed surrounding the tissue expander and marked on the skin, whose area of the plane polygon itself could be calculated easily depending on the length of the margin or the height and regarded as the area of the skin without tissue expander;Step ② to ④ above were repeated, and the actual area of the skin involved was measured by wet-cloth sampling method, and then the increased skin area expanded by tissue expander was calculated. ⑦The ratio of liquid volume infused into tissue expander to expanded skin area at different parts were calculated. RESULTS： ① When measuring skin area over tissue expander or surface area of the shot by wet-cloth sampling method, coefficients of variation were all less than 2%. ②Compared with the method to measure the surface area of shot with 4 kg, measurement error of wetcloth sampling method was 1.53%. ③The ratio of liquid volume （infused into tissue expander） to expanded skin area at 5 different parts were ranged from 1.53-5.44. CONCLUSION： With convenient, practical, fine validity and reliability in measurement of surface area of skin after expansion, the wet-cloth sampling method can be used widely.