乳房皮下切除与自体组织即刻乳房再造

目的探索乳房皮下切除与几种方法的乳房再造术，即腹直肌肌皮瓣或背阔肌肌皮瓣加乳房假体或局部皮瓣等即刻再造乳房的方法。方法选择乳腺导管内原位癌10例和巨大乳腺良性肿瘤5例，顺乳晕切口活检，病理检查确立诊断后，采用经乳腺切口行乳癌或巨大肿瘤的乳房皮下切除术，若乳癌或良性肿瘤体积较大，另于腋窝部加做顺腋下皱襞的附加切口，以便于取出切除的组织及切除乳腺的腋尾部，同时可以切取腋淋巴结行冰冻切片活检。然后，应用腹直肌肌皮瓣或背阔肌肌皮瓣加乳房假体或局部皮瓣即刻行再造乳房，充填乳房切除后的空间，仅以少量的肌皮瓣皮肤修复乳头、乳晕切除后的缺损，并在此转移皮瓣上再造乳头、乳晕。结果经过多专科协作共完成15例，随访结果良好，无肿瘤复发。此法再造的乳房易与健侧乳房对称，保留了原有乳房皮肤的良好感觉，外观形态自然，再造乳房瘢痕较少，且手术切口瘢痕隐蔽。结论在严格选择手术适应证防止乳腺癌复发的前提下，乳房皮下切除与即刻乳房再造法，对乳腺导管内原位癌和巨大乳腺良性肿瘤患者I期完成肿瘤切除和乳房再造术，具有积极有效的意义。     

Viscoelastic properties of acid- and alkaline-treated human dermis: a correlation between total surface charge and elastic modulus

BACKGROUND: One of the major mechanical functions of collagenous tissues is the storage, transmission and dissipation of elastic energy during mechanical deformation. In skin, mechanical energy is stored during loading and then is transmitted and dissipated, which protects skin from mechanical failure. Thus energy storage (elastic properties) and dissipation (viscous properties) are important characteristics of extracellular matrices. METHODS: A uniaxial incremental stress relaxation test method has been used to characterize the time-dependent (viscous) and time-independent (elastic) properties of human dermis. Viscoelasticity was investigated in processed human dermis that was equilibrated at pHs of 3.0, 7.4 and 11.0 in an effort to study the link between electrostatic interactions within the collagen matrix and macroscopic tissue properties. RESULTS: Our results show that the solution pH and the charge on collagen significantly affected the high-strain elastic behavior of dermis; the elastic behavior of skin has previously been shown to be directly correlated with axial stretching of the collagen triple helix in crosslinked collagen fibrils. A positive linear correlation existed between the high-strain elastic modulus and both pH (R(2)=0.96) and the total number of charged residues on collagen (R(2)=0.93). These results provide in vitro/ex vivo evidence that charged groups on the surface of collagen molecules in processed human skin influence the high-strain elastic properties of dermis and are likely to be involved in elastic energy storage. CONCLUSION: It is proposed that the pH and charged residue dependency of the elastic modulus suggests that charged pair interactions and repulsions within and between collagen molecules are involved in elastic energy storage during stretching at high strains. It is hypothesized that elastic energy storage is associated with the stretching of pairs of charged amino acid residues that are found primarily in the flexible regions of collagen molecules.     

Moisturizing effect of cosmetic formulations containing Aloe vera extract in different concentrations assessed by skin bioengineering techniques

BACKGROUND/PURPOSE: The polysaccharide-rich composition of Aloe vera extracts (Aloe barbadensis Miller), often used in cosmetic formulations, may impart moisturizing properties to the product. The aim of this study was to evaluate the effect of cosmetic formulations containing different concentrations of freeze-dried Aloe vera extract on skin hydration, after a single and a 1- and 2-week period of application, by using skin bioengineering techniques. METHODS: Stable formulations containing 5% (w/w) of a trilaureth-4 phosphate-based blend were supplemented with 0.10%, 0.25% or 0.50% (w/w) of freeze-dried Aloe vera extract and applied to the volar forearm of 20 female subjects. Skin conditions in terms of the water content of the stratum corneum and of transepidermal water loss (TEWL) (Corneometer CM 825 and Tewameter TM 210) were analysed before and after a single and 1- and 2-week period of daily application. RESULTS: After a single application, only formulations supplemented with 0.25% and 0.50% (w/w) of Aloe vera extract increased the water content of the stratum corneum, while after the 2-week period application, all formulations containing the extract (0.10%, 0.25% and 0.50%) had the same effect, in both cases as compared with the vehicle. TEWL was not modified after a single and after 1- and 2-week period of application, when compared with the vehicle. CONCLUSION: Our results show that freeze-dried Aloe vera extract is a natural effective ingredient for improving skin hydration, possibly through a humectant mechanism. Consequently, it may be used in moisturizing cosmetic formulations and also as a complement in the treatment of dry skin.     

定向皮肤扩张器在面颈部瘢痕治疗中的应用

目的:探讨定向扩张器在治疗面颈部瘢痕中的临床应用。方法:回顾性分析我科2000年至2004年用定向扩张器治疗48例面颈部瘢痕患者。手术分两期:先于瘢痕附近正常皮下置入定向扩张器,皮肤充分扩张后行扩张器取出、瘢痕切除、局部皮瓣转移。结果:48例患者共治疗56处瘢痕,置入扩张器60个,一次修复最大面积为12cm×16cm,除5例遗留部分瘢痕经第二次皮肤扩张修复外,所有患者均得到有效治疗;扩张期并发症18处(30%),以扩张器外露最多见。结论:定向皮肤扩张器在面颈部瘢痕治疗中有很大的应用价值。但应重视预防并发症。     

Mid-infrared spectroscopy on skin using a silver halide fibre probe in vivo

Background/aim: Mid-infrared spectroscopy is a versatile method for in vivo investigation of skin after topical treatment with skin care products.
Methods: FTIR-spectrometer (Bruker Optics) with a flexible silver halide fibre probe (Infrared Fiber Sensors).
Results: Absorbance spectra from 700 to 3000 cm⁻¹ have been recorded to gain information about proteins (amide-I and amide-II vibrations at 1650 and 1550 cm⁻¹), esters (1740 cm⁻¹), carboxylic acid (1710 cm⁻¹), polyalcohols (1050 cm⁻¹) and hydrocarbons (CH _n vibrations at 2800–3000 cm⁻¹).
Conclusions: Using the particular light guide, we were able to measure for the first time the effects of lip care products on lips directly. Furthermore, water binding and glycerol content of the skin could be determined simultaneously, as well as the replenishment of lipids by lipid-enriched bath oil.     

Epidemiology of nonmelanoma skin cancer (NMSC) in Europe: accurate and comparable data are needed for effective public health monitoring and interventions

Summary Nonmelanoma skin cancer (NMSC) is the most common malignancy occurring in white populations. It is currently becoming an important challenge in terms of public health management as the increasing incidence rates will probably have a tremendous impact on healthcare costs. Possible factors driving this rise in NMSC numbers are increases in both acute and prolonged UV exposure together with increasing numbers of older people in the population. A better understanding of NMSC epidemiology in Europe is essential if an evidence-based European-wide public health policy is to be developed. It is obvious this can only be achieved by recording and analysing comparative epidemiological data. Finally, by improving the skin examination training for physicians, developing guidelines and exchanging best practices, a high level of healthcare could be provided for NMSC.     

Dysfunction of the pupillary light reflex following migraine headache

Using pupillometry and sympathetic skin responses we compared the changes in local and systemic autonomic function within one week of a migraine attack. We investigated whether the measurement of the pupillary light reflex provides further information on the pathophysiology of migraine. Forty-two migraine patients and forty-two healthy age-matched controls were included. The parameters that were measured were the amplitude of the pupillary light reflex, the pupil size at the beginning of the measurement, the latency, the velocity of constriction and the velocity at the end of the dilatation. The average pupil size was 6.43 mm in the migraine group and 6.7 mm in the control group (p < 0.01). Reduced velocity of constriction and smaller amplitude of constriction in migraine patients within two days of an attack were signs of a parasympathetic dysfunction (p < 0.05). The sympathetic skin response did not differ significantly between migraine sufferers and controls. These findings indicate that both parasympathetic and sympathetic nerves supplying the eye are involved in migraine headache presumably due to effects on the pericarotid sympathetic fibers and involvement of trigeminal-parasympathetic reflexes. Received: 24 July 2001, Accepted: 16 July 2002 Correspondence to K. Schepelmann, M. D.     

老年人与青年人皮肤血流量比较研究

目的 判定增龄对皮肤血流量的影响。方法 用PIM2-LDPI检测皮肤血流量。结果 老年组前额、左手指背、命门穴部位皮肤血流量分别为:(1.94±0.86)V,(1.92±0.52)V和(0.71±0.19)V,与青年组比较差异无显著性。但是,老年男性在命门穴的皮肤血流量明显高于青年男性(P<0.05),老年女性前额的皮肤血流量明显降低(P<0.01)。男性比女性的皮肤血流量高。结论 皮肤血流量的差异无年龄相关性,男性组的皮肤血流量比女性组高。     

应用和推广烧伤皮肤再生医疗技术的体会(二)

目的：通过临床实践总结、分析、认识干细胞与再生医学理论在烧伤创疡中的作用与效果；方法：应用MEBT／MEBO观察烧伤创疡创面的再生修复变化。结果：MEBT／MEBO治疗77种创疡疾病冶愈率达92％以上，有效率达100％。结论：MEBT／MEN)治疗慢性体表性溃疡及皮肤病性皮肤损伤、感染性溃疡效果满意。