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qs Nd Yag

Hyun Ji Kang, Jung Im Na, Jong Hee Lee, Mi Ryung Roh, Joo Yeon Ko, Sung Eun Chang
PURPOSE: To characterize the risk factors of Korean patients for postinflammatory hyperpigmentation (PIH) during treatment of solar lentigines using a Q-switched 532-nm Nd: YAG (QS 532 NY) laser. MATERIALS AND METHODS: The present retrospective multicenter study was conducted at the dermatology clinics of five tertiary hospitals in Korea. Between October 2007 and January 2013, 516 patients were enrolled and reviewed for clinical features and factors associated with PIH...
November 15, 2016: Journal of Dermatological Treatment
Baishuang Yue, Qianli Yang, Jinhua Xu, Zhong Lu
Melasma is an acquired disorder of symmetrical hyperpigmentation commonly seen in patients with Fitzpatrick skin types III and IV. Various novel therapeutic modalities have emerged to treat melasma. The large-spot low-fluence QS Nd:YAG laser has been widely used in Asia; however, the modality needs to be optimized because of the high recurrence rate. The objective of this study is to explore the clinical efficacy and safety of fractional-mode (Pixel) Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) 1064-nm laser for treatment of melasma in Chinese patients...
November 2016: Lasers in Medical Science
Hilal Gokalp, Ayse Deniz Akkaya, Yasemin Oram
OBJECTIVE: This study assessed the safety and clinical efficacy of a low-fluence 1064-nm Q-switched neodymium-doped:yttrium aluminum garnet (QS-Nd:YAG) laser in the treatment of patients with melasma. METHODS: The study evaluated 34 melasma patients treated at a single institution using a 1064-nm QS-Nd:YAG laser. The laser parameters were 6 mm spot size and 2.5 J/cm(2) fluence with multiple passes for 6-10 (median 8) sessions at 2-week intervals. Outcomes were evaluated using photography, the modified Melasma Area and Severity Index (mMASI) score, and patient satisfaction interviews after the last treatment and 1 year after the last treatment...
June 28, 2016: Journal of Cosmetic Dermatology
Yanting Liu, Weihui Zeng, Songmei Geng
BACKGROUND: The Q-switched neodymium-doped yttrium aluminum garnet (QS Nd:YAG) laser has a significant effect in treating nevus of Ota, but there is lack of a retrospective study about the characteristics of efficacy. AIMS AND OBJECTIVES: To retrospectively analyze the correlation between the clinical characteristics and efficacy, complications, recurrence of QS Nd:YAG laser in treating nevus of Ota. MATERIALS AND METHODS: One hundred and seventy-one Chinese patients (144 female, 27 male) of nevus of Ota were treated with the 1064-nm QS Nd:YAG laser...
May 2016: Indian Journal of Dermatology
Camila Anna Hofbauer Parra, Mariana Figueroa Careta, Neusa Yuriko Sakai Valente, Nuno Eduardo Guimaraes de Sanches Osório, Luis Antonio Ribeiro Torezan
BACKGROUND: Melasma is a frequent and difficult to treat skin disorder. Results of laser therapy are inconsistent. OBJECTIVE: To determine the safety and efficacy of low-fluence Q-switched neodymium-doped yttrium aluminum garnet (QS Nd:YAG) laser for melasma treatment and assess recurrence rates and histopathologic findings before and after treatment. METHODS: Twenty patients were treated with 10 weekly sessions of low-fluence 1064-nm QS Nd:YAG laser at 1-week intervals...
April 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Brian Wei Cheng Anthony Tian
OBJECTIVE: To demonstrate a combination laser therapy to treat Hori's nevus. DESIGN: A prospective study. SETTING: A Singapore-based clinic. PARTICIPANTS: Five female patients, aged 30-46 years, with bilateral malar Hori's nevus. MEASUREMENTS: Photographs were taken before treatment and 1 month after laser treatment was completed. These were graded by three independent physicians. The patients were also asked to grade their treatment response subjectively...
October 2015: Journal of Cutaneous and Aesthetic Surgery
Yisheng Wong, Siong See Joyce Lee, Chee Leok Goh
The Q-switched 1064-nm neodymium-doped yttrium aluminum garnet (QS 1064-nm Nd:YAG) laser is increasingly used for nonablative skin rejuvenation or "laser toning" for melasma. Multiple and frequent low-fluence, large-spot-size treatments are used to achieve laser toning, and these treatments are associated with the development of macular hypopigmentation as a complication. We present a case series of three patients who developed guttate hypomelanotic macules on the face after receiving laser toning treatment with QS 1064-nm Nd:YAG...
December 2015: Annals of Dermatology
Tai Kyung Noh, Bo Young Chung, Un Cheol Yeo, SeoYoun Chang, Mi Woo Lee, Sung Eun Chang
BACKGROUND: Q-switched (QS) 532-nm lasers are widely used to treat solar lentigines. OBJECTIVE: To compare the efficacy and safety of 660-nm and 532-nm QS neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers in the treatment for lentigines in Asians. MATERIALS AND METHODS: The halves of each face (randomly chosen) of 8 Korean Fitzpatrick Skin Type III-IV women with facial solar lentigines were treated with either 660-nm or 532-nm lasers...
December 2015: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Agata Mankowska, Wojciech Kasprzak, Zygmunt Adamski
OBJECTIVE: The aim of the study was to evaluate the efficacy of tattoo removal treatments using the 1064-nm Q-switched (QS) Nd:YAG laser. BACKGROUND DATA: Today, QS lasers appear to be the most common, effective, and safest methods to treat unwanted markings. MATERIAL AND METHODS: A total of 64 patients with 75 unwanted tattoos were enrolled in the study. Tattoo clearance was evaluated according to the color intensity - concentration of pigment: group I (34) - black; group II (41) - gray...
December 2015: Journal of Cosmetic Dermatology
Xiang Wen, Yong Li, Xian Jiang
Different types of Q-switched (QS) lasers have been used successfully to treat nevus of Ota. The purpose of this study was to compare the clinical efficacy and complication of QS alexandrite (QS Alex) laser versus QS neodymium:yttrium aluminum garnet (Nd:YAG) (QS Nd:YAG) laser for bilateral nevus of Ota. Seventeen patients with bilateral nevus of Ota were treated randomly with QS Alex in one half of face and QS Nd:YAG in the other half with an interval of at least 3 months between each. Subjective assessment was made by both patients and dermatologists...
2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Stephanie Gy Ho, Chee Leok Goh
Techniques for tattoo removal have evolved significantly over the years. The commonly used Quality-switched (QS) ruby, alexandrite, and Nd:YAG lasers are the traditional workhorses for tattoo removal. Newer strategies using combination laser treatments, multi-pass treatments, and picosecond lasers offer promising results. The tattoo color and skin type of the patient are important considerations when choosing the appropriate laser. Standard protocols can be developed for the effective and safe treatment of tattoos...
January 2015: Journal of Cutaneous and Aesthetic Surgery
R D Griffith, B J Simmons, F N Bray, L A Falto-Aizpurua, M-A Yazdani Abyaneh, K Nouri
Argyria is a benign skin disease characterized by blue to slate-grey discoloration that is caused by deposition of silver granules in the skin and/or mucus membranes as a result of long-term ingestion of ionized silver solutions or exposure to airborne silver particles. The skin discoloration can be generalized or localized and is exacerbated by sunlight. The skin discoloration is usually permanent, and until recently, there has been no effective treatment for argyria. Over the past 6 years, a number of case reports and one case series have described cases of argyria that were successfully treated with a 1064 nm Q-switched (QS) neodymium-doped yttrium aluminium garnet (Nd:YAG) laser; however, a review of these studies has never been reported in the dermatologic literature...
November 2015: Journal of the European Academy of Dermatology and Venereology: JEADV
Hye Rang On, Won Jin Hong, Mi Ryung Roh
Riehl's melanosis, a form of dermatitis characterized by reticulate pigmentation, typically presents as a gray-brown to black hyperpigmentation on the face and neck. Among the various etiologic factors suggested, photoallergic reaction and pigmented contact dermatitis resulting from exposure to drugs, coal tar dyes, optical whitener, or other ingredients found in cosmetics are believed to be the major contributing factors in this disease. The histopathological features of Riehl's melanosis mainly consist of pigmentary incontinence along with infiltration of numerous dermal melanophages and lymphohistiocytes...
June 2015: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Kabir Sardana, Rashmi Ranjan, Atul M Kochhar, Khushbu Goel Mahajan, Vijay K Garg
BACKGROUND: Tattoo removal has evolved over the years and though Q-switched laser is the 'workhorse' laser, it invariably requires multiple sittings, which are dependent on numerous factors, including the skin colour, location of the tattoo, age of the tattoo, colour of pigment used, associated fibrosis and the kind of tattoo treated. Though ablative lasers, both pulsed CO2 and Er:YAG, have been used for recalcitrant tattoos, very few studies have been done comparing them with pigment-specific lasers...
2015: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Salman M S Alsaad, E Victor Ross, Vineet Mishra, Lee Miller
BACKGROUND AND OBJECTIVES: To determine the safety and efficacy of a 50 ns Q switched Nd YAG laser vs. a 5 ns Q switched Nd YAG laser for clearance of melasma. To compare subject satisfaction, efficacy, and comfort level between the two lasers. STUDY DESIGN/MATERIALS AND METHODS: This is a prospective, randomized split face clinical study. The study was approved by the Scripps IRB. Ten healthy female subjects with moderate to severe melasma were enrolled. Each subject had three laser treatments one month apart...
December 2014: Lasers in Surgery and Medicine
Chun Pil Choi, Seon Mi Yim, Soo Hong Seo, Hyo Hyun Ahn, Young Chul Kye, Jae Eun Choi
BACKGROUND: Despite the effectiveness of low-fluence Q-switched Nd:YAG laser (QSNY) treatment in melasma, adverse events, including mottled hypopigmentation (MH) and rebound hyperpigmentation (RH) have been reported. OBJECTIVE: To compare the effectiveness and safety of combination therapy using low-fluence QSNY and long-pulse Nd:YAG laser (LPNY) (Dual toning), with low-fluence QSNY monotherapy (QS toning), in Asian melasma patients. MATERIALS AND METHODS: Patients were treated for 10 sessions at 1-week intervals with QSNY (6 mm spot); 2...
February 2015: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Mei-Ching Lee, Chun-Shin Chang, Yau-Li Huang, Shyue-Luen Chang, Chih-Hsiang Chang, Ying-Fang Lin, Sindy Hu
Melasma is an acquired pigment disorder showing symmetrical hyperpigmentation of the face characterized by light to dark brown patches with indistinct borders on both cheeks. Melasma is prevalent in middle-aged women with harmless hormone imbalances. It is also known as the mask of pregnancy and is prevalent in most child-bearing women. It fluctuates month by month, and yet, there is no promising treatment. The Q-switched neodymium-doped yttrium aluminum garnet (QS-Nd:YAG) laser (1,064-nm wavelength) was introduced in Asia years ago for both skin toning and treatment of facial pigment...
January 2015: Lasers in Medical Science
Alaa E A Moubasher, Eman M K Youssef, Doaa A E Abou-Taleb
BACKGROUND: Melasma is a common disorder of facial hyperpigmentation that is often resistant to treatment. OBJECTIVE: To evaluate the efficacy of trichloroacetic acid (TCA) peeling in comparison with double frequency Q-switched neodymium-doped:yttrium aluminum garnet (QS-Nd:YAG) laser in the treatment of melasma. PATIENTS AND METHODS: Sixty-five adult Egyptian female patients with melasma were enrolled in this study. Wood light was used for determination of the histological type of melasma...
August 2014: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Woo Jin Yun, Hye-Rim Moon, Mi-Woo Lee, Jee-Ho Choi, Sung-Eun Chang
BACKGROUND: Recently, intense pulsed light (IPL) and low-fluence Q-switched neodymium-doped yttrium aluminum (LF-QS-Nd:YAG) laser have been successfully used to treat melasma. OBJECTIVE: To evaluate the effectiveness and safety of combined novel fractionated IPL (IPL-F) with LF-QS-Nd:YAG laser in patients with melasma. METHODS: Twelve patients underwent 6 treatment sessions of concomitant IPL-F and LF-QS-Nd:YAG laser (combination group), and 12 patients underwent 6 treatment session of IPL-F alone (IPL only group)...
August 2014: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Sabrina G Fabi, Daniel P Friedmann, Ane B Niwa Massaki, Mitchel P Goldman
BACKGROUND: Melasma is distressing for patients and challenging for physicians to treat. Clinical data from controlled comparative studies is lacking to support the efficacy, longevity, and safety of laser treatments for melasma. OBJECTIVE: Compare the efficacy and safety of low fluence Q-switched neodymium-doped yttrium aluminum garnet (1,064 nm) laser (Nd:YAG) versus low-fluence Q-switched alexandrite laser (755 nm) (QSAL) for the treatment of facial melasma...
September 2014: Lasers in Surgery and Medicine
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