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607nm和595nm脉冲染料激光治疗良性表皮色素性病变的疗效和安全性比较
595 nm脉冲染料激光(pulsed dye laser,PDL)能被表皮组织中的黑色素有效吸收并致表皮基底细胞层的变性和溶解,因而被广泛用于良性表皮色素性病变(epidermal pigmented lesions,EPLs)的治疗,但因其在血管组织中存在着较高的吸收,所以在治疗中有意外诱发紫癜的高风险.而607 nm脉冲染料激光对黑色素的吸收水平与595nm激光大致相当,但在血管组织的吸收明显较低,因此可能更适用于EPLs的治疗.
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脉冲染料激光治疗系统性红斑狼疮患者并发的鲜红斑痣:临床治疗情况与并发症
脉冲染料激光(pulsed dye laser,PDL)是治疗鲜红斑痣(port wine stains,PWS)和其他血管性疾病的主要治疗方法,对于其治疗结缔组织病如系统性红斑狼疮(systemic lupus erythematosus,SLE)患者并发的PWS的相宜治疗参数文献上尚无报道,临床也无评估.由于结缔组织疾病本身或治疗药物对其的影响,光热损伤使患者病变皮肤对激光能量呈现不同反应.本文报道2例PDL治疗成年女性SLE患者的PWS,观察不良副反应的发生并讨论其治疗情况及剂量调整.
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Objective. To assess the effectiveness of the flashlamp-pumped pulsed dye laser (Photogeneca V, Synosure Corp, Boston, United States) in the treatment of port-wine stains. Methods. One hundred and ninety-four consecutive patients with port-wine stains were treated with a flashlamp-pumped pulsed dye laser in Peking Union Medical College Hospital from January 1998 to August 1999. Results. Of 194 patients who completed treatment, 56.2% had more than 60% fading of the lesion and only 6.7% had less than 20% fading. An average of 3.6 treatments were needed to achieve more than 60% fading. The response was better in children than in adults, although the difference was not significant. Pigmentary change (usually transient) occurred in 3.1% of patients. Conclusions. This study confirms the efficacy of the flashlamp-pumped pulsed dye laser in the treatment of port-wine stains in children and adults.
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595nm脉冲染料激光治疗鲜红斑痣1560例临床研究
目的 评价595 nm脉冲染料激光治疗不同年龄段鲜红斑痣患者的临床疗效和不良反应.方法 应用美国Candela公司生产的595 nm脉冲染料激光治疗鲜红斑痣1560例,根据患者年龄、皮损类型等采用不同参数进行激光照射治疗.结果 595 nm脉冲染料激光治疗鲜红斑痣总有效率为76.73%(1197/1560),疗效与患者年龄、皮损类型等因素关系密切,不良反应发生率低,且耐受性好.结论 595 nm脉冲染料激光治疗鲜红斑痣安全有效.
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激光治疗鲜红斑痣的疗效影响因素及展望
鲜红斑痣为常见的毛细血管及后微静脉扩张畸形,病理检查显示,畸形扩张的血管一般位于皮下300~600μm 深度,直径一般为10~150μm,增厚型鲜红斑痣血管直径可达到500μm[1]。脉冲染料激光(pulsed dye laser,PDL)及其他常用治疗鲜红斑痣的激光,在治疗数次后,皮损颜色变淡,面积减小,但很少完全消除。部分患者治疗4~5次后进入瓶颈期,再次治疗效果不佳。究其原因,可能与开始治疗年龄、皮损部位、范围、颜色、血管情况、选择的激光参数、治疗次数、间隔时间等有关。
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脉冲染料激光在皮肤病中的应用
在激光医学中,应用普遍的原理为光的热效应,即皮肤组织中心分子对特定波长激光能量的吸收,使激光照射部位的温度急剧升高,从而损伤组织,达到对皮肤组织治疗的作用.1983年Anderson[1]通过对皮肤色素及血管病变的病理分析、黑素细胞及氧合血红蛋白吸收光谱的分析,根据激光技术的特殊性质,提出根据光脉冲的选择性吸收对皮肤病变组织进行手术的原理,即选择性光热分解理论(Selective photothermolysis).随后Q-开关及冷却剂的联合应用,使脉冲染料激光(Pulsed Dye Laser PDL)广泛用于色素性皮肤病的治疗.