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Laser Vaporization (laser + vaporization)
Selected AbstractsPyogenic Granuloma: Satellitosis after Carbon Dioxide Laser Vaporization Resolved with an Intense Pulsed Light SystemDERMATOLOGIC SURGERY, Issue 1 2007SABELA PARADELA MD First page of article [source] Angiokeratoma Circumscriptum Naeviforme: Successful Treatment with Carbon-Dioxide Laser VaporizationDERMATOLOGIC SURGERY, Issue 2 2005Jesús del Pozo MD Background Angiokeratoma circumscriptum naeviforme (ACN) is an unusual type of localized angiokeratoma that occurs more frequently in females and is usually located on the buttocks or thighs, showing a unilateral distribution. ACN usually causes large lesions, which may require laser ablation because they often are too extensive to perform surgical excision. Carbon-dioxide laser is a known alternative for treating angiokeratomas. Objective Report of two cases of ACN treated with carbon-dioxide laser vaporization. Patients and methods A 28-year-old woman with a hyperkeratotic, violaceus plaque on her left buttock and a 24-year-old woman with a similar lesion on her right buttock were treated with a carbon-dioxide laser. Two laser passes were performed on each lesion within a single session. Results A successful cosmetic aspect of treated areas was obtained, with minimal pigmentary or textural changes. After a 2-year follow-up in the first patient and a 6-month follow-up in the second patient, no recurrence of the lesions was observed. Conclusions Our results, obtaining relevant cosmetic improvement after a few sessions of treatment, with low morbidity and minimal secondary effects, suggest that continuous-wave carbon-dioxide laser vaporization is a safe and effective treatment for ACN. JESÚS DEL POZO, MD, AND EDUARDO FONSECA, MD, HAVE INDICATED NO SIGNIFICANT INTEREST WITH COMMERCIAL SUPPORTERS. [source] Port-Wine Stain Nodules in the Adult: Report of 20 Cases Treated by CO2 Laser VaporizationDERMATOLOGIC SURGERY, Issue 8 2001Jesús Del Pozo MD Background. Port-wine stain (PWS) is a congenital vascular malformation of the superficial dermal vessels. These vessels become progressively ectatic, with development of nodular and hypertrophic areas on the surface of the lesions. Objective. To determine the efficacy of CO2 laser vaporization in the treatment of nodules in PWS. Methods. Twenty adult patients with PWS who developed nodules and hypertrophy on the surface of the lesions were treated by CO2 laser vaporization. Only one pass was performed to each area of the lesions, using a continuous and defocused mode, with a power density of 10 W/cm2. When the treated lesion was very large, several sessions of treatment were necessary to vaporize its entire surface. Photographic controls were performed before and after treatment. Results. The nodules and hypertrophy were removed and the smooth surface of the lesions was reestablished. The color, usually violaceous, was transformed in a slight erythema. Conclusion. CO2 laser is a good method for treatment of nodules and hypertrophy in PWS. With adequate precautions, excellent cosmetic results can be obtained. Other more-specific laser systems may be successively used to treat the remaining erythema. [source] The Isolable Matryoshka Nesting Doll Icosahedral Cluster [As@Ni12@As20]3- as a "Superatom": Analogy with the Jellium Cluster Al13 - Generated in the Gas Phase by Laser Vaporization.CHEMINFORM, Issue 2 2007R. Bruce King Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Angiokeratoma Circumscriptum Naeviforme: Successful Treatment with Carbon-Dioxide Laser VaporizationDERMATOLOGIC SURGERY, Issue 2 2005Jesús del Pozo MD Background Angiokeratoma circumscriptum naeviforme (ACN) is an unusual type of localized angiokeratoma that occurs more frequently in females and is usually located on the buttocks or thighs, showing a unilateral distribution. ACN usually causes large lesions, which may require laser ablation because they often are too extensive to perform surgical excision. Carbon-dioxide laser is a known alternative for treating angiokeratomas. Objective Report of two cases of ACN treated with carbon-dioxide laser vaporization. Patients and methods A 28-year-old woman with a hyperkeratotic, violaceus plaque on her left buttock and a 24-year-old woman with a similar lesion on her right buttock were treated with a carbon-dioxide laser. Two laser passes were performed on each lesion within a single session. Results A successful cosmetic aspect of treated areas was obtained, with minimal pigmentary or textural changes. After a 2-year follow-up in the first patient and a 6-month follow-up in the second patient, no recurrence of the lesions was observed. Conclusions Our results, obtaining relevant cosmetic improvement after a few sessions of treatment, with low morbidity and minimal secondary effects, suggest that continuous-wave carbon-dioxide laser vaporization is a safe and effective treatment for ACN. JESÚS DEL POZO, MD, AND EDUARDO FONSECA, MD, HAVE INDICATED NO SIGNIFICANT INTEREST WITH COMMERCIAL SUPPORTERS. [source] CO2 Laser Treatment of Epidermal Nevi: Long-Term SuccessDERMATOLOGIC SURGERY, Issue 7 2002Sarah Boyce MD background. Epidermal nevi have been notoriously difficult to treat due to their large size and often conspicuous location. Variable results have been obtained with different laser treatments, and scarring and/or incomplete removal is typical after excisional or other destructive modalities. objective. To outline the successful use of a short-pulsed CO2 laser in the long-term eradication of epidermal nevi in three patients. methods. Three females (ages 15,19) presented with extensive grouped verrucous papules and plaques on the face, trunk, and extremities. A pulsed CO2 laser was used to vaporize the lesions using a 500 mJ pulse energy, 3 mm spotsize, and 7 watts of power. results. All lesions healed without incident. No lesional recurrence was observed 10 to 13 months after treatment except in one small area on the ankle in one patient. conclusions. Carbon dioxide laser vaporization of epidermal nevi provides good clinical effect and offers unique advantages for the treatment of these lesions, including effective intraoperative hemostasis with excellent lesional visualization. It is also possible to treat widespread areas in one laser treatment session. While the results of this series clearly show the benefit of CO2 laser treatment, epidermal nevi may not always respond so favorably, due in part to the variability in their depths of involvement. [source] Port-Wine Stain Nodules in the Adult: Report of 20 Cases Treated by CO2 Laser VaporizationDERMATOLOGIC SURGERY, Issue 8 2001Jesús Del Pozo MD Background. Port-wine stain (PWS) is a congenital vascular malformation of the superficial dermal vessels. These vessels become progressively ectatic, with development of nodular and hypertrophic areas on the surface of the lesions. Objective. To determine the efficacy of CO2 laser vaporization in the treatment of nodules in PWS. Methods. Twenty adult patients with PWS who developed nodules and hypertrophy on the surface of the lesions were treated by CO2 laser vaporization. Only one pass was performed to each area of the lesions, using a continuous and defocused mode, with a power density of 10 W/cm2. When the treated lesion was very large, several sessions of treatment were necessary to vaporize its entire surface. Photographic controls were performed before and after treatment. Results. The nodules and hypertrophy were removed and the smooth surface of the lesions was reestablished. The color, usually violaceous, was transformed in a slight erythema. Conclusion. CO2 laser is a good method for treatment of nodules and hypertrophy in PWS. With adequate precautions, excellent cosmetic results can be obtained. Other more-specific laser systems may be successively used to treat the remaining erythema. [source] In situ time-resolved measurements of carbon nanotube and nanohorn growthPHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 11 2007D. B. Geohegan Abstract Growth mechanisms of carbon nanotubes are investigated and compared for both high- and low-temperature synthesis methods through experiments utilizing time-resolved, in situ imaging and spectroscopy. High-speed videography and pyrometry measured the timeframes for growth for single-wall carbon nanotubes (SWNTs) and nanohorns (SWNHs) by laser vaporization (LV) at 1150 °C, revealing that C can self-assemble at high temperatures preferentially into SWNH structures without catalyst assistance at rates comparable to catalyst-assisted SWNT growth by either laser vaporization or chemical vapor deposition (CVD). Laser interferometry and videography reveal the coordinated growth of vertically-aligned nanotube arrays (VANTAs) by CVD at 550,900 °C. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Dilatation for Assisted Ventilation-Induced Laryngotracheal StenosisTHE LARYNGOSCOPE, Issue 9 2005Philippe Clément MD Abstract Objective: To assess the long-term results of dilatation and our experience with dilatation for assisted ventilation-induced laryngotracheal stenosis. Design: A retrospective study of 32 patients primarily treated with dilatation for assisted ventilation-induced laryngotracheal stenosis between 1977 and 2002. Setting: A tertiary care center and university teaching hospital. Patients: There were 19 men and 13 women aged 15 to 76 years. The stenosis was cicatricial with some inflammatory process in 27 patients and completely mature in 5 patients. The stenosis involved the cricoid and the trachea in four patients. In 28 patients, the stenosis involved only the trachea. Methods: Dilatation was performed with serially sized rigid bronchoscopes. Endoscopic laser vaporization was never performed in this series. Six patients were treated with only one dilatation. The 26 remaining patients were treated with successively 2 to 10 dilatations (mean, 3.3 dilatations). The dilatation success rate was analyzed using the Kaplan-Meier method. Results: Median duration of follow-up was 1.8 years. Mortality rate was 9.4%. The overall failure rate was 71.8%. Twenty patients presented with recurrent stenosis. The treatment of recurrent stenosis consisted of tracheal resection with end-to-end anastomosis (11 patients, 55%), cricotracheal anastomosis (5 patients, 25%), tracheal endoprosthesis (2 patients, 10%), and tracheotomy (1 patient, 5%). All patients who underwent tracheal or cricotracheal anastomosis were successfully treated. None of the variables under analysis (sex, age, medical history, cause for intubation, intubation type and duration, delay from initial injury, degree of stenosis, length of trachea involved, number of dilatations) were statistically related to the incidence of complications and the success rate of dilatations. Conclusions: We do not recommend dilatation technique as the sole treatment for assisted ventilation-induced laryngotracheal stenosis. This technique is helpful in case of emergency to restore an airway and useful for the assessment of stenosis. [source] Comparison of potassium-titanyl-phosphate laser vaporization of the prostate and transurethral resection of the prostate: update of a prospective non-randomized two-centre studyBJU INTERNATIONAL, Issue 10 2008Robin Ruszat OBJECTIVES To evaluate the intermediate-term clinical efficacy and the rate of complications in 80 W photoselective vaporization of the prostate (PVP) with the potassium-titanyl-phosphate laser (GreenlightTM, (AMS, Minnetonka, MN, USA) compared with transurethral resection of the prostate (TURP) in a prospective non-randomised two-centre study. PATIENTS AND METHODS From December 2003 to August 2006, 396 patients (PVP 269, TURP 127) with lower urinary tract symptoms secondary to benign prostatic hyperplasia were included in the study. There was a significant difference in mean age (72 years for PVP vs 68 for TURP, P = 0.001). Patients were therefore stratified in age categories (<70, 70,80, >80 years) and compared for perioperative variables, functional outcome and complications, with a follow-up of up to 24 months. RESULTS The mean prostate size was greater (overall, 62 vs 48 mL, P < 0.001) and mean operative duration longer (overall 72 vs 53 min; P = 0.001) for PVP in all age categories. The rate of intraoperative bleeding (3% vs 11%), blood transfusions (0% vs 5.5%) and capsule perforations (0.4% vs 6.3%), and early postoperative clot retention (0.4% vs 3.9%) was significantly lower for PVP. Hospitalization time was significantly shorter in the PVP group for patients aged <70 years (3.0 vs 4.7 days) and 70,80 years (4.0 vs 5.0 days; P = 0.001). The improvement of peak urinary flow rate was higher after TURP for any age category. The International Prostate Symptom Score and postvoid residual volume during the follow-up showed no significant difference. After 12 months the overall prostate size reduction was 63% (,30 mL) after TURP and 44% (,27 mL) after PVP. The rate of repeat TURP/PVP was higher in the PVP group (6.7% vs 3.9%, not significant) within the follow-up of up to 2 years. The incidence of urethral and bladder neck strictures was comparable. CONCLUSIONS PVP was more favourable in terms of perioperative safety. Although patients assigned for PVP were older and had larger prostates, PVP resulted in a similar functional outcome. Further follow-up is needed to draw final conclusions about the long-term efficacy of PVP. [source] | ||||||||||