755nm翠绿宝石激光联合800nm半导体激光治疗腰骶部多毛疗效分析

目的:回顾性分析755nm翠绿宝石激光联合800nm半导体激光治疗腰骶部多毛的临床疗效和安全性。方法:收集笔者医院2017年1月1日-2018年6月30日收治的100例腰骶部多毛患者病例资料,其中50例患者为单纯755nm翠绿宝石激光治疗;50例患者为755nm翠绿宝石激光联合800nm半导体激光治疗。分析两组患者的治疗效果、不良反应发生情况及对治疗效果的满意度。结果:相较于单纯755nm激光治疗,755nm翠绿宝石激光联合800nm半导体激光脱毛的有效率和治愈率显著高于755nm治疗组,两组比较有统计学意义(P<0.05);组间的VAS(视觉模拟评分法)疼痛评分比较,差异无统计学意义(P>0.05),但联合治疗组发生疼痛的次数显著低于单一治疗组(P<0.05);单纯治疗组出现2例色素沉着斑,联合治疗组无色素沉着斑出现,两组比较差异无统计学意义(P>0.05),两组均未出现色素减退斑及瘢痕;联合治疗组患者的总满意率显著高于单一治疗组(P<0.05)。结论:755nm翠绿宝石激光联合800nm半导体激光治疗腰骶部多毛临床疗效明显,安全性良好,疼痛感轻,值得广泛应用。     

Diode Laser Hair Removal in Patients Undergoing Isotretinoin Therapy

BACKGROUND: It is generally believed that any intervention in skin while on isotretinoin or within 6 months after the treatment can lead to prolonged healing and scarring. OBJECTIVE: The objective was to evaluate the side effects of laser hair removal in patients undergoing isotretinoin treatment. METHODS: Seven female patients undergoing isotretinoin therapy for acne were treated with a diode laser with a wavelength of 810 nm, a contact-cooling device, and a variable pulse width of 50 to 1000 ms. All volunteers received first treatment in the axillary or bikini area at 21 J/cm(2) (80 W) and the second treatment was done in the same area at 24 J/cm(2) (90 W). Six volunteers received additional treatments of chin area with a fluence of 21 or 24 J/cm(2). All volunteers were evaluated and photographed 1 week and 1 month after each treatment and degree of erythema, pigmentary change, vesiculation, swelling, and scarring was documented. RESULTS: There was no erythema, pigmentary change, swelling, or scarring at any follow up visits. One volunteer presented with a bulla 1 week after second treatment, which was resolved at 1-month follow-up. All volunteers were satisfied with the degree of hair removal with two treatments. CONCLUSION: This limited study suggests that diode laser hair removal is safe in patients undergoing isotretinoin therapy.     

The Use of a New Diode Laser for Hair Removal

BACKGROUND: Diode and long-pulse 1064 Nd:YAG lasers, because of their long wavelengths and extended pulse durations, have gained popularity over the last several years for photoepilation in individuals with dark skin phenotypes. OBJECTIVE: To analyze the clinical efficacy and histologic features of a new 810-nm diode laser in the treatment of unwanted hair in individuals with Fitzpatrick skin types II-IV. METHODS: Twenty-four female subjects (mean age, 33; range, 17-53) were treated three times at monthly intervals with the MeDioStara diode laser (Zeiss-Meditech, Jenna, Germany): wavelength 810 nm, spot size 12 mm, pulse duration 50 msec; fluence 25-35 J. Patients had skin types II-IV and light to dark brown hair. Hair counts were carried out using handheld magnifiers at baseline and at months 1, 2, 3, and 6. Six individuals had biopsies taken after treatment and at 3 and 6 months. RESULTS: A mean hair removal efficiency of 74% and 79% was noted at 3 and 6 months, respectively, and was best in those individuals with skin type III. Hair counts after treatment and at last follow-up were significantly lower when compared with the baseline counts (P<0.0001). Histologic analysis revealed a range from early catagen induction to complete follicular destruction. CONCLUSIONS: This study supports the clinical photoepilatory efficiency of a new 810-nm diode laser in producing 70% clinical hair removal efficiency at 6 months. Histopathologic evaluation suggests that this decrease in hair counts is probably secondary to heat trauma to the follicular epithelium, resulting in complete follicular destruction and stopping of anagen phase.     

Laser Hair Removal with Alexandrite versus Diode Laser Using Four Treatment Sessions: 1-Year Results

BACKGROUND: Laser hair removal is the treatment of choice for hypertrichosis. The two most commonly used hair removal lasers are compared. OBJECTIVE: To present the results of a comparative study examining the role of wavelength, fluence, spot size, pulse width, and cooling systems on long-term results after a series of four laser hair removal treatments using the 755 nm alexandrite and 800-810 nm diode lasers. METHODS: The axillae of 15 untanned, type I-V patients were treated side by side four times at 4- to 6-week intervals with a 755 nm, 3-msec pulse width, cryogen spray-equipped alexandrite laser and an 800 nm, variable pulse width, cooled sapphire window-equipped diode laser. Each patient was pretested and treated with the maximum fluence tolerated at the largest spot size available for each laser (12 mm round/113 mm2 for the alexandrite and 9 mm for the diode). RESULTS: Evaluations were done at 3, 6, 9, and 12 months after the last treatment. Twelve-month results with the alexandrite and diode lasers achieved 85% versus 84% hair reduction. The fact that tan avoidance was strictly followed permitted the use of relatively high fluences (25-30+ J/cm(2)) even in type IV patients. For most patients, four treatment sessions using high fluences (30-40 J/cm(2)) with relatively large spot sizes (12 mm round for the 755 nm alexandrite and 9 mm for the 800 nm diode) resulted in 12-month hair reductions in the 90% range. CONCLUSION: Both the alexandrite and diode lasers in this 12-month study produced excellent long-term hair reductions.     

Laser Hair Removal

BACKGROUND: The mechanism and permanence of laser-assisted hair removal remains a formidable task in the medical community. OBJECTIVE: The purpose of this study was to determine the safety and long-term efficacy of the long-pulsed or normal mode alexandrite infrared laser for hair depilation. METHODS: Beginning in October 1996, a total of 31 anatomic sites on 22 patients ranging in age from 25 to 59 years (mean 42 years) were evaluated to assess hair removal. Treatment sites included 17 upper lips, 9 legs, 2 backs, and 3 bikini regions. Eligible patients were of Fitzpatrick skin types I-III. Patients were treated using the long-pulsed alexandrite infrared laser at 755 nm, single-pulse technique, 10 mm spot size, 10% overlap, pulse durations of 5, 10, and 20 msec, and a fluence of 20 J/cm2. Subjective patient improvement and objective, blinded graded improvement was assessed at 1, 2, 3, and 6 months. RESULTS: Objective blinded grading at 6 months revealed that hair reduction varied both with the pulse duration and anatomic location. Maximum reductions observed were 40%, 56%, 50%, and 15% for the lip, leg, back, and bikini areas, respectively. Upper lip hair reduction increased from 40% to 54% at 6 months when a second treatment was performed 8 weeks after the initial treatment. CONCLUSION: The long-pulsed alexandrite laser is safe and effective in reducing hair growth. Treatment efficacy varies with the anatomic location, pulse duration, and number of treatments. A single-pulse technique utilizing a 10 msec pulse duration at 20 J/cm2 produced the greatest hair reduction. No permanent adverse effects occurred on skin types I-III at the parameters tested.     

Hair Growth Induced by Diode Laser Treatment

BACKGROUND: Although hair reduction by long-pulsed red and infrared lasers and light sources is generally quite effective, paradoxical hair growth has rarely been observed following treatment. OBJECTIVE: To report a case of thick hair growth following 810 nm diode laser treatment and its subsequent treatment. METHODS. A 24-year-old man who had previously had laser hair reduction on his posterior neck was treated to a test area on his upper back. RESULTS: Thick terminal hair developed in the treated area subsequent to laser treatment. Further treatment of this area removed the terminal hair but resulted in terminal hair growth in an annular distribution surrounding the treatment site. CONCLUSIONS: Diode laser treatment rarely stimulates terminal hair growth. This phenomenon should be studied to better understand hair growth cycles and to help develop more effective treatments for hair loss and hair growth.     

Hair Removal Using an 810 nm Gallium Aluminum Arsenide Semiconductor Diode Laser: A Preliminary Study

BACKGROUND: Laser hair removal is a popular treatment method for removing unwanted hair. Several laser systems are available for laser hair removal. The gallium aluminum arsenide semiconductor diode (GAASD) laser is one of the newer laser modalities to be studied. OBJECTIVE: To evaluate the efficacy of the GAASD laser system in removing unwanted hair. METHODS: Twenty-six patients with brown or black hair growth were treated with the GAASD laser at fluences of 20-80 J/cm2. Hair regrowth was measured 4 weeks after the first treatment, 4 weeks after the second treatment, 4 weeks after the third treatment, and 4 weeks, 8 weeks, and 8 months after the fourth treatment. CONCLUSION: GAASD laser treatment resulted in hair growth delay in all treated regions. Repeated laser treatments did not produce an increased number of vellus hairs. The percentage of hair reduction fluctuated between 5% and 13% with the second or third treatment averaging the highest percent reduction. In all cases, the percentage of hair reduction of the treatment sites evaluated at 8 months after the fourth treatment was less than both the second and third treatments (highest average percent reduction) and the fourth (last) treatment.     

The Effect of Different Spot Sizes on the Efficacy of Hair Removal Using a Long-Pulsed Diode Laser

BACKGROUND: In the last years several lasers have proven their efficacy for hair removal. However, little is known about the efficacy of varying the spot size with those lasers. OBJECTIVE: To evaluate the long-term efficacy of hair removal using a diode laser with different spot sizes. METHODS: A long-pulsed diode laser (2 x 60 msec) was used. The spot size was 8 mm, 12 mm, or 14 mm. Twenty consenting volunteers were treated three times at regular intervals of 3 weeks. The ratio of the number of hairs in the treated area to an adjacent area left untreated (control) was referred to as regrowth. RESULTS: One month after laser treatment, regrowth was 23% (8 mm), 12% (12 mm), and 13% (14 mm). After 3 months regrowth was 67% (8 mm), 54% (12 mm), and 55% (14 mm). Fifteen months after treatment 4 of 16 volunteers had a regrowth rate of less than 25%. CONCLUSION: The results provide evidence for an effective and long-lasting growth delay of hairs using the long-pulsed diode laser. The use of large spot sizes improved the growth delay of hairs measured 1 month after treatment.     

Hair Reduction Using a Scanning 800 nm Diode Laser

BACKGROUND: Numerous lasers are currently available for hair removal, yet there are still few studies that have examined the role of fluence, light dose, hair color, and treatment number in laser hair reduction. OBJECTIVE: To demonstrate the efficacy and safety of a scanning 800 nm diode laser for hair reduction. METHODS: An 800 nm scanning diode laser was used to deliver 24, 38, or 48 J/cm2 to a 3 cm x 3 cm area of skin located on the back, groin/bikini area, or thigh in 36 adult patients with varying shades of brown or black hair. Patients received one to four treatments during the course of the study. Hair loss was evaluated at both 30 and 90 days after final treatment. Biopsies were obtained from 20 consenting patients. RESULTS: Significant fluence-dependent hair reduction was demonstrated between treatment and control groups. At 48 J/cm2, the highest dose, a mean hair reduction of 43% was achieved 30 days after the final treatment, and 34% was achieved 90 days after the final treatment. Darker hairs were more effectively treated than lighter hairs. CONCLUSIONS: Hair reduction can be safely and effectively achieved using a scanning 800 nm diode laser.