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1.
Urologe A ; 60(3): 344-350, 2021 Mar.
Artigo em Alemão | MEDLINE | ID: mdl-33355683

RESUMO

BACKGROUND: Erectile dysfunction is a condition that shows a continuously growing prevalence in the male population. The penis prosthesis implant (PPI) qualifies as an effective form of therapy. OBJECTIVES: The aim of this study was to analyze the sexual satisfaction rate and quality of life in patients who had suffered from erectile dysfunction and who were treated with a penile prosthesis. The patient's partners were also surveyed. METHODS: We collected data from patients who underwent surgery in the Center of Excellence for Penile Implants, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany. Questionnaires with validated scores (EDITS, EDITS Partner) were sent to all patients and their partners via mail. RESULTS: The satisfaction rate in this study was high which shows that the patients and partners are pleased, and the high sexual satisfaction rate led to a higher quality of life. CONCLUSION: The penile prosthesis implantation as a last option of therapy for erectile dysfunction is useful and brings more than adequate results.


Assuntos
Disfunção Erétil , Prótese de Pênis , Disfunção Erétil/epidemiologia , Alemanha , Humanos , Masculino , Orgasmo , Satisfação do Paciente , Qualidade de Vida , Inquéritos e Questionários
2.
Int J Impot Res ; 32(1): 18-23, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31562495

RESUMO

We have evaluated the data of patients who underwent ectopic high submuscular reservoir placement during implantation of inflatable penile prostheses and compared them to those of patients who underwent to traditional reservoir placement in the space of Retzius (SR). The main focus was on evaluating complications and patient satisfaction rates in both methods of RP. One hundred and forty-two patients underwent implantation of the Coloplast Titan OTR prosthesis with exclusive use of the "Clover Leaf" reservoir. We performed a retrospective evaluation, analyzing the treatment-associated complications by means of the Clavien-Dindo classification. All patients as well as their partners received questionnaires with validated scores. Group I: 70 (49.3%) patients who underwent HSM RP. Group II: 72 (50.7%) patients who underwent SR RP. Neither grade IV nor grade V Clavien-Dindo complications were documented. In total, we observed 4 (3.3%) cases grade III b complications, which resulted in revision. Distribution was as follows: infected device (n = 4), scrotal hematoma (n = 2), scrotal seroma (n = 1), and scrotal skin fistula (n = 1). 88% of the patients with ectopic HSM RP and 81% with traditional SR RP were satisfied with their implant. Of the patients with HSM RP, 64.3% (n = 45; BMI range: 18.5-28.8) reported that they were able to feel their reservoir by palpation immediately after surgery. Palpability disappeared in 80% of the patients in this group (BMI > 26.5) after capsule formation at 3 months post-surgery. Only one patient (1.4%; BMI 20.5) reported that he was able to see the reservoir. Our findings suggest that the novel reservoir placement is safe, efficient and results in excellent patient satisfaction, even if the reservoir is initially palpable or visible.


Assuntos
Disfunção Erétil/cirurgia , Satisfação do Paciente/estatística & dados numéricos , Implante Peniano/métodos , Prótese de Pênis , Escroto/cirurgia , Parede Abdominal/cirurgia , Adulto , Idoso , Idoso de 80 Anos ou mais , Índice de Massa Corporal , Humanos , Masculino , Pessoa de Meia-Idade , Desenho de Prótese , Estudos Retrospectivos , Inquéritos e Questionários
3.
Injury ; 48(7): 1674-1677, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28545725

RESUMO

BACKGROUND: Surgery of malleolar fractures are often delayed due to oedema of the ankle. The use of intermittent pneumatic compression (IPC) is thought to reduce oedema of the fracture site and thereby time to surgery in patients with malleolar fractures. PURPOSE: To investigate the influence of IPC on the time from admission to surgery in adult patients with internal fixated primary malleolar fractures. METHODS: February 1st 2013 IPC was introduced as a standard treatment for all patients admitted with a malleolar fracture. Data was retrieved from the hospital database 2 years prior and after the introduction date. The patients were found using ICD-10 diagnoses codes (DS825-8) in combination with NOMESCO procedure codes (KNHJ40-3, KNHJ60-3, KNHJ70-3, KNHJ80-3). One reviewer examined all the journals and classified the x-ray images by the AO classification. The primary outcome measure was time from diagnosis to surgery. RESULTS: 74 patients in the IPC cohort and 113 in the non-IPC cohort were included in the study. Time from admission to surgery was 21.9 (10.8-45.0) hours in the control group and 22.1 (8.9-41.2) hours in the IPC group. The difference is not statistically significant (p=0.420). A subgroup analysis divided the patients operated before and after 24h from admission. The median (IQR) time to surgery for patients operated before 24h was 10.9 (6.4-16.9) hours for the control group and 9.9 (5.8-20.1) hours in the IPC group (p=0.989). The median (IQR) time to surgery for patients operated after 24h was 21.5 (4.1-57.0) hours for the control group and 18.4 (7.4-32.3) hours in the IPC group (p=0.353). INTERPRETATION: There was no benefit from IPC on time to surgery in patients with acute primary malleolar fracture in a cohort with a mean surgical delay less than 24h.


Assuntos
Fraturas do Tornozelo/fisiopatologia , Edema/prevenção & controle , Fixação Interna de Fraturas , Dispositivos de Compressão Pneumática Intermitente , Tempo para o Tratamento/estatística & dados numéricos , Adulto , Fraturas do Tornozelo/complicações , Fraturas do Tornozelo/cirurgia , Edema/etiologia , Feminino , Humanos , Dispositivos de Compressão Pneumática Intermitente/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Valores de Referência , Reprodutibilidade dos Testes , Estudos Retrospectivos , Resultado do Tratamento
5.
Biofouling ; 28(3): 267-77, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22435853

RESUMO

Staphylococcal colonization of implants is a serious complication of orthopaedic surgery. Anti-infectious modification of implant surfaces may serve to prevent bacterial colonization. The authors set out to develop an in vitro test system for the analysis of prevention of biofilm formation by Staphylococcus epidermidis and Staphylococcus aureus on implant materials. Biofilm growth was monitored over 10 days on titanium disks in order to develop appropriate test parameters. Bacterial cell counts following ultrasonic treatment of the colonized samples were compared with scanning electron microscope images of the specimens. Copper ion containing surfaces (ie copper [Cu] and inter-metallic Ti-Cu films) were used for growth inhibition assays: copper ion releasing specimens led to reduced bacterial numbers in biofilms and decreased bacterial persistence in the model used. The assay used represents an inexpensive and quick in vitro screen for the antibacterial effects of novel implant surface materials.


Assuntos
Antibacterianos/farmacologia , Biofilmes/efeitos dos fármacos , Cobre/farmacologia , Próteses e Implantes/microbiologia , Infecções Relacionadas à Prótese/prevenção & controle , Staphylococcus aureus/efeitos dos fármacos , Staphylococcus epidermidis/efeitos dos fármacos , Titânio/farmacologia , Biofilmes/crescimento & desenvolvimento , Materiais Revestidos Biocompatíveis/farmacologia , Meios de Cultura , Testes de Sensibilidade Microbiana/métodos , Infecções Relacionadas à Prótese/microbiologia , Staphylococcus aureus/crescimento & desenvolvimento , Staphylococcus epidermidis/crescimento & desenvolvimento
6.
Orthopade ; 40(6): 528-34, 2011 Jun.
Artigo em Alemão | MEDLINE | ID: mdl-21584734

RESUMO

Implant infections remain feared and severe complications after total hip replacement. An even higher rate of periprosthetic infections can be observed after revision surgery in comparison to primary total hip replacement. An additional threat for patients with artificial joints arises from the fact that bacteria resistant to a multitude of antibiotics are encountered with increasing frequency in the hospital setting.Among these the enterobacteria producing extended spectrum ß-lactamases (ESBL) are the second most frequent group of multiresistant pathogens. ESBLs are enzymes which possess the ability to hydrolyse third and fourth generation cephalosporins resulting in a distinctive resistance against these antibiotics. Even though ESBLs were first described in the early 1980's and now represent pathogens of utmost importance in intensive care units, they have been hardly considered in orthopedic and trauma surgery.In the present manuscript we provide an overview of the epidemiology and diagnostics of ESBL-expressing bacteria and demonstrate the difficulties in managing implant-associated infections with resistant bacteria. Furthermore, we emphasize the importance of recognizing ESBL-positive bacteria as increasingly important pathogens which require special precautions and treatment. Clinical evaluations suggest that ESBLs in orthopedic and trauma surgery are not a rare phenomenon any more.


Assuntos
Artroplastia de Quadril/efeitos adversos , Infecções por Enterobacteriaceae/etiologia , Infecções por Enterobacteriaceae/prevenção & controle , Prótese de Quadril/efeitos adversos , Infecções por Enterobacteriaceae/metabolismo , Humanos , beta-Lactamases/biossíntese
7.
Oncogene ; 30(3): 301-12, 2011 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-20818417

RESUMO

C-Src is infrequently mutated in human cancers but it mediates oncogenic signals of many activated growth factor receptors and thus remains a key target for cancer therapy. However, the broad function of Src in many cell types and processes requires evaluation of Src-targeted therapeutics within a normal developmental and immune-competent environment. In an effort to understand the appropriate clinical use of Src inhibitors, we tested an Src inhibitor, SKI-606 (bosutinib), in the MMTV-PyVmT transgenic mouse model of breast cancer. Tumor formation in this model is dependent on the presence of Src, but the necessity of Src kinase activity for tumor formation has not been determined. Furthermore, Src inhibitors have not been examined in an autochthonous tumor model that permits assessment of effects on different stages of tumor progression. Here we show that oral administration of SKI-606 inhibited the phosphorylation of Src in mammary tumors and caused a rapid decrease in the Ezh2 Polycomb group histone H3K27 methyltransferase and an increase in epithelial organization. SKI-606 prevented the appearance of palpable tumors in over 50% of the animals and stopped tumor growth in older animals with pre-existing tumors. These antitumor effects were accompanied by decreased cellular proliferation, altered tumor blood vessel organization and dramatically increased differentiation to lactational and epidermal cell fates. SKI-606 controls the development of mammary tumors by inducing differentiation.


Assuntos
Compostos de Anilina/farmacologia , Diferenciação Celular/efeitos dos fármacos , Neoplasias Mamárias Experimentais/patologia , Nitrilas/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Quinolinas/farmacologia , Animais , Feminino , Perfilação da Expressão Gênica , Neoplasias Mamárias Experimentais/irrigação sanguínea , Neoplasias Mamárias Experimentais/genética , Camundongos , Camundongos Transgênicos
8.
Skin Therapy Lett ; 12(5): 5-9, 2007 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-17609809

RESUMO

In recent years, there has been increasing concern among physicians, patient advocacy groups, and media watchdogs that laser, light, and cosmetic surgery are being practiced by poorly trained professionals, with resulting preventable injuries to patients. In response, several professional organizations have developed guidelines for the delegation of laser services to nonphysician providers. These guidelines delineate appropriate qualifications for delegating physicians and nonphysician providers, and also describe the circumstances and settings in which delegation is appropriate.


Assuntos
Terapia a Laser/normas , Fototerapia/normas , Cirurgia Plástica/normas , Humanos , Terapia a Laser/educação , Designação de Pessoal , Guias de Prática Clínica como Assunto , Competência Profissional , Estados Unidos
9.
Obes Rev ; 6(4): 307-22, 2005 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-16246216

RESUMO

The neuropeptide Y (NPY)/peptide YY (PYY) system has been implicated in the physiology of obesity for several decades. More recently ignited enormous interest in PYY3-36, an endogenous Y2-receptor agonist, as a promising anti-obesity compound. Despite this interest, there have been remarkably few subsequent reports reproducing or extending the initial findings, while at the same time studies finding no anti-obesity effects have surfaced. Out of 41 different rodent studies conducted (in 16 independent labs worldwide), 33 (83%) were unable to reproduce the reported effects and obtained no change or sometimes increased food intake, despite use of the same experimental conditions (i.e. adaptation protocols, routes of drug administration and doses, rodent strains, diets, drug vendors, light cycles, room temperatures). Among studies by authors in the original study, procedural caveats are reported under which positive effects may be obtained. Currently, data speak against a sustained decrease in food intake, body fat, or body weight gain following PYY3-36 administration and make the previously suggested role of the hypothalamic melanocortin system unlikely as is the existence of PYY deficiency in human obesity. We review the studies that are in the public domain which support or challenge PYY3-36 as a potential anti-obesity target.


Assuntos
Fármacos Antiobesidade/farmacologia , Peso Corporal/efeitos dos fármacos , Ingestão de Alimentos/efeitos dos fármacos , Peptídeo YY/farmacologia , Animais , Comportamento Animal , Interpretação Estatística de Dados , Dipeptidil Peptidase 4/metabolismo , Humanos , Fragmentos de Peptídeos , Peptídeo YY/administração & dosagem , Receptores de Neuropeptídeo Y/agonistas , Resposta de Saciedade/efeitos dos fármacos , Especificidade da Espécie , Estresse Fisiológico/fisiopatologia
10.
Hautarzt ; 54(7): 603-13, 2003 Jul.
Artigo em Alemão | MEDLINE | ID: mdl-12835862

RESUMO

The improved understanding of laser-tissue interaction along with the latest advances of laser technology have led to the development of sophisticated, safe, and user-friendly laser systems that provide effective treatment for a variety of aesthetic skin conditions. The use of lasers and their tissue-specific capabilities in the treatment of pigmented and vascular lesions has been greatly expanded to include rhytides, photoaged skin, atrophic scars, and unwanted hair. In addition, laser techniques have been employed in traditional "rejuvenating" procedures of aged skin, e.g., face-lifting, blepharoplasty, and hair transplantation, decreasing the intra-operative time and limiting the recovery period. These advances have led to a wide acceptance of cutaneous laser surgery by the dermatologic community and have created an increasing popularity among the public. The purpose of this article is to review the applications of lasers in aesthetic dermatology and discuss their limitations and potential side effects.


Assuntos
Terapia a Laser , Procedimentos de Cirurgia Plástica , Blefaroplastia , Cicatriz/cirurgia , Dermabrasão , Dermatoses Faciais/cirurgia , Feminino , Seguimentos , Remoção de Cabelo , Humanos , Lentigo/cirurgia , Masculino , Seleção de Pacientes , Transtornos da Pigmentação/cirurgia , Cuidados Pós-Operatórios , Cuidados Pré-Operatórios , Procedimentos de Cirurgia Plástica/efeitos adversos , Ritidoplastia , Fatores de Risco , Envelhecimento da Pele , Tatuagem , Telangiectasia/cirurgia , Fatores de Tempo
11.
Gesundheitswesen ; 64(8-9): 499-502, 2002.
Artigo em Alemão | MEDLINE | ID: mdl-12221615

RESUMO

From Nov. 1 1990 to Dec. 31 2001 4928 applicants (61 % female, 39 % male) were examined, totalling 6580 pre-employment examinations, to decide whether they fulfilled the health requirement criteria for civil servants. Standardised aptitude criteria were used, career-specific requirements taken into account. To exclude with a high probability were any risks of premature disability for service or frequent disorders. In 394 cases (= 5.99 %) the results were negative. This assessment was final in 298 cases (= 4.53 % of all examinations) or was confirmed negative in repeated examinations even after special conditions had been imposed. Main reasons for disqualification were second- and third-degree adipositas with additional risk factors or a metabolic syndrome, chronic cardio-vascular and metabolic diseases requiring permanent treatment, malignant neoplasms or non-fulfilment of the criteria for special careers. The comparatively high rate of disqualification is mainly due to the high average age of the applicants examined (40 % of all applicants were over 40, 13 % were older than 50). Purpose, sensitivity and specifics of such examinations are discussed. Taking into consideration the high rate of civil servants prematurely unfit for work, such pre-employment examinations are regarded as highly justified. Moreover, it is necessary to have clear guidelines, aptitude criteria and examination procedures for individual careers. It is also important to adhere strictly to local responsibility for pre-employment examinations.


Assuntos
Doença Crônica/epidemiologia , Governo , Candidatura a Emprego , Avaliação da Capacidade de Trabalho , Adulto , Estudos Transversais , Definição da Elegibilidade/legislação & jurisprudência , Feminino , Alemanha , Humanos , Masculino , Pessoa de Meia-Idade , Triagem Multifásica
12.
J Med Chem ; 44(23): 3965-77, 2001 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-11689083

RESUMO

Subsequent to the discovery of 4-[(2,4-dichlorophenyl)amino]-6,7-dimethoxy-3-quinolinecarbonitrile (1a) as an inhibitor of Src kinase activity (IC(50) = 30 nM), several additional analogues were prepared. Optimization of the C-4 anilino group of 1a led to 1c, which contains a 2,4-dichloro-5-methoxy-substituted aniline. Replacement of the methoxy group at C-7 of 1c with a 3-(morpholin-4-yl)propoxy group provided 2c, resulting in increased inhibition of both Src kinase activity and Src-mediated cell proliferation. Analogues of 2c with other trisubstituted anilines at C-4 were also potent Src inhibitors, and the propoxy group of 2c was preferred over ethoxy, butoxy, or pentoxy. Replacement of the morpholine group of 2c with a 4-methylpiperazine group provided 31a, which had an IC(50) of 1.2 nM in the Src enzymatic assay, an IC(50) of 100 nM for the inhibition of Src-dependent cell proliferation and was selective for Src over non-Src family kinases. Compound 31a, which had higher 1 and 4 h plasma levels than 2c, effectively inhibited tumor growth in xenograft models.


Assuntos
Antineoplásicos/síntese química , Inibidores Enzimáticos/síntese química , Nitrilas/síntese química , Piperazinas/síntese química , Quinolinas/síntese química , Quinases da Família src/antagonistas & inibidores , Animais , Antineoplásicos/química , Antineoplásicos/farmacocinética , Antineoplásicos/farmacologia , Divisão Celular/efeitos dos fármacos , Linhagem Celular Transformada , Inibidores Enzimáticos/química , Inibidores Enzimáticos/farmacocinética , Inibidores Enzimáticos/farmacologia , Feminino , Fibroblastos/metabolismo , Humanos , Immunoblotting , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , Nitrilas/química , Nitrilas/farmacocinética , Nitrilas/farmacologia , Fosforilação , Piperazinas/química , Piperazinas/farmacocinética , Piperazinas/farmacologia , Quinolinas/química , Quinolinas/farmacocinética , Quinolinas/farmacologia , Relação Estrutura-Atividade , Células Tumorais Cultivadas , Tirosina/metabolismo , Ensaios Antitumorais Modelo de Xenoenxerto
13.
Arch Dermatol ; 137(10): 1317-21, 2001 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-11594855

RESUMO

BACKGROUND: Closed dressings are thought to promote postoperative wound healing after laser skin resurfacing; however, quantitative data are lacking. OBJECTIVE: To compare postoperative healing after combination carbon dioxide and erbium:YAG full-face laser skin resurfacing in patients who were treated with a silicone occlusive dressing (Silon-TSR; Bio Med Sciences, Inc, Bethlehem, Pa) vs open-wound care consisting of soaks and ointment application. DESIGN: Thirty-five patients with closed dressings compared retrospectively with 35 control subjects with open-wound care. In a prospective evaluation, 27 patients with closed dressings were then compared with 27 historical controls matched by age, sex, skin type, and treatment technique. Erythema, crusting, swelling, pain, pruritus, purpura, long-term complications, and dressing comfort were evaluated. SETTING: Referral-based academic practice. RESULTS: Prospectively, closed-dressing and open-wound care groups differed significantly in maximum erythema severity (1.8 vs 2.0 on a scale of 0-3; P =.03), noticeable erythema duration (15.4 vs 31.1 days; P =.04), and time until complete erythema resolution (41.8 vs 96.1 days; P =.02). Swelling resolution was more rapid in the dressing group (12.1 vs 29.5 days; P =.02). Crusting was limited to uncovered areas in the dressing group, and crusting duration was shorter (5.0 vs 9.1 days; P<.001). Pain was more likely to be reported prospectively, but severity was mild, in the closed-dressing group. Other short- and long-term complications did not differ significantly. Subjective patient attitudes toward the dressing were positive. CONCLUSIONS: Occlusive silicone dressing application decreases immediate postoperative morbidity with significantly reduced severity and duration of erythema and decreased duration of swelling and crusting. Long-term results and complication rates remain unchanged.


Assuntos
Eritema/prevenção & controle , Terapia a Laser/efeitos adversos , Curativos Oclusivos , Silicones/uso terapêutico , Dermatopatias/cirurgia , Cicatrização , Eritema/etiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Satisfação do Paciente , Período Pós-Operatório , Estudos Prospectivos , Estudos Retrospectivos , Índice de Gravidade de Doença
14.
J Am Acad Dermatol ; 45(4): 566-8, 2001 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-11568748

RESUMO

The erbium:YAG laser is a relatively new instrument for skin rejuvenation. We present a case of a "Q-switched laser-resistant" café-au-lait macule that was successfully treated with the erbium:YAG laser.


Assuntos
Manchas Café com Leite/terapia , Terapia a Laser , Adulto , Érbio , Feminino , Humanos , Resultado do Tratamento
15.
Artigo em Inglês | MEDLINE | ID: mdl-11294526

RESUMO

The aim of the study was to determine whether clinical and/or urodynamic changes in bladder function occur during pregnancy. Assessment consisted of a urinary symptom questionnaire, urogynecological examination and urodynamic investigations, which were repeated 6 weeks after pregnancy. Sixty-six patients had the initial and 40 the follow-up assessments. Statistical analysis was done by 95% confidence intervals (95% CI). Nocturia, frequency, dysuria, urgency and stress incontinence occurred significantly more frequently during pregnancy. Urinary tract infection was diagnosed in 18% of patients during pregnancy and asymptomatic bacteriuria in 9%. Genuine stress incontinence was diagnosed in 12% during pregnancy and in none after pregnancy (95% CI 1% to 24%). An unstable detrusor was diagnosed in 23% of patients during pregnancy and in 15% after pregnancy (95% CI -8% to 23%). Strong desire to void, urgency, maximum cystometric capacity, maximum flow rate and average flow rate were all statistically significantly decreased during pregnancy. It is concluded that significant changes occur in bladder function during pregnancy.


Assuntos
Complicações na Gravidez/patologia , Bexiga Urinária/fisiologia , Transtornos Urinários/etiologia , Adulto , Feminino , Humanos , Período Pós-Parto , Gravidez , Estudos Prospectivos , Bexiga Urinária/patologia , Transtornos Urinários/patologia , Urodinâmica
17.
J Am Acad Dermatol ; 42(5 Pt 1): 784-6, 2000 May.
Artigo em Inglês | MEDLINE | ID: mdl-10775854

RESUMO

The World Wide Web has provided the public with easy and affordable access to a vast range of information. However, claims may be unsubstantiated and misleading. The purpose of this study was to use cutaneous laser surgery as a model to assess the availability and reliability of Web sites and to evaluate this resource for the quality of patient and provider education. Three commercial methods of searching the Internet were used, identifying nearly 500,000 possible sites. The first 100 sites listed by each search engine (a total of 300 sites) were compared. Of these, 126 were listed repeatedly within a given retrieval method, whereas only 3 sites were identified by all 3 search engines. After elimination of duplicates, 40 sites were evaluated for content and currency of information. The most common features included postoperative care suggestions, options for pain management or anesthesia, a description of the way in which lasers work, and the types of lasers used for different procedures. Potential contraindications to laser procedures were described on fewer than 30% of the sites reviewed. None of the sites contained substantiation of claims or referrals to peer-reviewed publications or research. Because of duplication and the prioritization systems of search engines, the ease of finding sites did not correlate with the quality of the site's content. Our findings show that advertisements for services exceed useful information.


Assuntos
Internet , Terapia a Laser , Dermatopatias/cirurgia , Humanos
19.
Lasers Surg Med ; 26(2): 158-63, 2000.
Artigo em Inglês | MEDLINE | ID: mdl-10685088

RESUMO

BACKGROUND AND OBJECTIVE: The pulsed dye laser was developed based on the concept of selective photothermolysis. By using a wavelength of light well absorbed by the target and pulse duration short enough to spatially confine thermal injury, specific vascular injury could be produced. STUDY DESIGN/MATERIALS AND METHODS: Although the pulsed dye laser revolutionized the treatment of port wine stains (PWS) and a variety of other vascular lesions, the ideal thermal relaxation time for the vessels in PWS is actually 1-10 ms, not 450 micros of the original pulsed dye laser machines. These original theoretical calculations recently have been proven correct in a study that used both an animal vessel model and in human PWS. RESULTS: Longer wavelengths of light, within the visible spectrum, penetrate more deeply into the skin and are more suitable for deeper vessels, whereas longer pulse durations are required for larger caliber vessels. CONCLUSION: A variety of lasers recently have been developed for the treatment of vascular lesions which incorporate these concepts into their design, including pulsed dye lasers at 1.5 ms, a filtered flash-lamp pulsed light source with pulse durations of 1-20 ms, several 532-nm pulsed lasers with pulse durations of 1 ms to as high as 100 ms, long pulsed alexandrite lasers at 755 nm with pulse durations up to 20 ms, pulsed diode lasers in the 800 to 900 nm range, and long pulsed 1064 Nd:YAG sources.


Assuntos
Terapia a Laser , Terapia a Laser/métodos , Mancha Vinho do Porto/cirurgia , Telangiectasia/cirurgia , Varizes/cirurgia , Humanos , Terapia a Laser/instrumentação
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