异体脱细胞真皮基质加自体刃厚皮复合移植远期随访评价

目的 评价异体ADM+自体刃厚皮复合移植的临床远期效果.方法 选择2001年3月-2008年10月,笔者单位收治的19例行异体ADM+自体刃厚皮复合移植患者为复合移植组(34个创面),同期9例行自体刃厚皮移植患者为对照组(11个创面).患者术后均随访2年以上.随访时,在曼彻斯特瘢痕量表的基础上设计随访对象评估表,评估移植皮肤的颜色、平整度、质地、挛缩、感觉、并发症情况,分值1～4分,得分越高、情况越差;采用温哥华瘢痕量表评估供皮区瘢痕形成情况;发放问卷调查患者满意度、移植期内健康记录;组织病理学方法观察其中4例患者皮肤组织结构.采用中立位法描述术前、术后及随访时患者关节活动范围.对数据进行非参数秩和检验、t检验或x2检验.结果 (1)复合移植组皮肤平整度、挛缩、质地评分分别为(1.6±0.5)、(1.8±0.8)、(1.5±0.8)分,显著低于对照组的(2.0±0.7)、(2.2±0.9)、(2.3±0.7)分(Z值分别为-2.058、-2.220、-2.323,P值均小于0.05);2组皮肤颜色、感觉、并发症评分结果相近(Z值分别为-0.628、-0.428、-2.520,P值均大于0.05).(2)复合移植组仅1个供皮区部分区域有轻度瘢痕.(3)复合移植组和对照组患者在疼痛、瘙痒和满意度方面比较,差异均无统计学意义(x2值分别为0.187、0.019、2.628,P值均大于0.05).(4)病理结果显示,手部复合移植后2年可见神经纤维结构,ADM在受体内未引起强烈的炎症反应.(5)复合移植组11处关节部位功能得到恢复或改善,另2处需再次手术.对照组2处关节部位均明显挛缩.结论 异体ADM+自体刃厚皮复合移植在防止瘢痕挛缩,改善功能及外观方面效果明显,长期存留于成人和儿童患者体内均未出现安全问题.     

Long-term outcome of xenogenic dermal matrix implantation in immunocompetent rats

BACKGROUND: Acellular dermal matrix (ADM) has been used successfully in the treatment of full-thickness skin injuries as an allogenic dermal substitute. To assess the efficacy of xenogenic ADM in such wounds, we examined the long-term wound healing and immunological responses to porcine ADM in a rat model. MATERIALS AND METHODS: Xenogenic and allogenic ADMs were produced by treating porcine (fresh or cryopreserved) or rat skin with dispase and Triton X-100. Full-thickness skin defects on the rat dorsum were implanted with porcine or rat ADMs and overlaid with split-thickness skin grafts (STSGs). Wounds were evaluated grossly and immunologically at 1, 6, and 12 months after surgery. RESULTS: Extensive wound contraction was seen in wounds implanted with porcine ADM, but healing was significantly (P < 0.01) better in the rat ADM or STSG groups at 6 and 12 months postsurgery. Sera obtained from porcine ADM-implanted rats reacted strongly with porcine ADM and specifically with the papillary dermis and basal lamina. One month postsurgery, extensive inflammation but few intact mast cells were seen in wounds implanted with porcine ADM and significant (P < 0.02) levels of residual porcine ADM were detectable immunologically. Little inflammation was evident in the STSG or rat ADM groups at any time. Significant lymphocyte proliferation (P < 0.05) occurred in the 6- and 12-month groups in response to porcine, but not rat, ADM. CONCLUSIONS: In wounds implanted with xenogenic ADM, a short-lived acute inflammatory response, long-lasting humoral and cell-mediated immune responses, and generally poor wound healing were observed.     

微粒皮移植治疗大面积深度烧伤后关节瘢痕挛缩的初步体会

目的 探讨大面积深度烧伤病人自体微粒皮与大张异体皮移植术治疗关节部位瘢痕挛缩的方法.方法 选择大面积深度烧伤后期瘢痕严重增生挛缩造成关节畸形而自体皮匮乏的病人11例,共31个关节,在全麻下切除部分瘢痕,彻底松解,矫正关节畸形,用微粒皮加异体皮覆盖创面,术后进行植皮区压迫和早期功能锻炼.随访12个月以上.通过术前、术后的皮肤外观、关节功能、组织学观察等进行效果评价.结果 微粒皮移植者皮肤外观及关节功能明显改善;组织学可见表皮较厚,部分可见表皮脚,真皮层较薄,胶原纤维排列较有规律.结论 微粒皮加大张异体皮移植术可用于治疗大面积深度烧伤病人关节部位瘢痕挛缩.     

复合皮移植修复烧伤功能部位创面疗效评价

目的探讨脱细胞同种异体真皮与自体刃厚皮复合移植修复深度烧伤功能部位创面的疗效。方法 2002年6月-2008年12月,收治30例烧伤及瘢痕整形患者共42个创面。男25例,女5例;年龄3～52岁,中位年龄31岁。烧伤24例35个创面,其中深Ⅱ度23个创面,Ⅲ度12个创面;病程3～45 d,平均24 d。瘢痕整形6例7个创面;病程9～21 d,平均16 d。42个创面分别位于颈部2个,手部4个,前臂及肘部8个,肩部3个,腘窝6个,膝部4个,小腿及足踝部15个。彻底清创、削痂及切除瘢痕后,创面范围为10 cm×10 cm～30 cm×20 cm。采用一步法将脱细胞同种异体真皮与自体刃厚皮复合移植修复创面。结果术后27例39个(92.9%)创面复合皮移植完全成活;3例3个(7.1%)创面复合皮部分坏死,分别经换药和自体皮片移植术后愈合。患者均获随访,随访时间30～34个月,平均32个月。复合皮有轻度色素沉着,外观平整,质地柔软,弹性好,皮肤耐磨;复合皮无挛缩及瘢痕增生,功能部位活动正常。刃厚皮供皮区未见瘢痕增生。结论脱细胞同种异体真皮与自体刃厚皮复合移植修复功能部位深度烧伤及瘢痕整形创面,可获得良好外形及功能。     

Comparison studies of the in vivo treatment of full‐thickness excisional wounds and burns by an artificial bilayer dermal equivalent and J‐1 acellular dermal matrix

The effects upon skin repair were compared between a homemade bilayer dermal equivalent (BDE), composed of a collagen/chitosan porous scaffold and a silicone membrane, and J‐1 acellular dermal matrix (ADM), a commercial ADM that is used widely in China to treat various skin defects. Full‐thickness excisional and burn wounds were prepared on the backs of pigs and then treated with the BDE and J‐1 ADM. Biopsy specimens were harvested on days 7, 14, and 21 after surgery for gross, biochemical, and molecular examinations. In comparison with the burn wounds, the excisional wounds showed accelerated granular tissue formation and superior integration with the equivalents, regardless of their type. Immunohistochemical, immunofluorescence, real time quantitative polymerase chain reaction and Western blotting analyses showed that the vascularization rates in the excisional wounds group were also significantly faster than those of the burn group for both dermal equivalents. There was no significant difference between J‐1 ADM and BDE treatment on the formation of newly formed blood vessels for the excisional wounds at days 7, 14, and 21. However, there was a significant difference in the number of nascent blood vessels formed in the burn wounds after treatment with J‐1 ADM compared with BDE. The highest numbers of newly formed and mature blood vessels were present in the J‐1 ADM‐treated excisional wounds after 21 days. Ultrathin skin grafts were further transplanted on to the regenerated dermis for 28 days, resulting in the repair of the full‐thickness wounds and production of a structure similar to normal skin.     

Evaluation of a combined calcium sodium alginate and bio-occlusive membrane dressing in the management of split-thickness skin graft donor sites

The optimal treatment of the split-thickness skin graft (STSG) donor site remains an unresolved issue. This study was conducted to evaluate the combined use of calcium sodium alginate and a bio-occlusive membrane dressing in the management of STSG donor sites. This study was a prospective evaluation of all patients requiring an STSG over a 6-month period ending October 1998. There were 57 patients with a mean age of 61 years. All skin grafts were harvested with an electric dermatome from the anterior thigh and were 0.012 to 0.016 inches thick. Donor sites were dressed with calcium sodium alginate followed by a bio-occlusive dressing. Postoperatively, the skin graft donor site dressing was removed and replaced. The mean skin graft area was 114 cm2. The first dressing change occurred, on average, 3 days postoperatively. All dressings were taken down and the wounds reevaluated 7 days postoperatively. Fifty-two patients (91%) had achieved complete reepithelialization by this time. Five patients (9%) required an additional dressing. All wounds were healed completely by postoperative day 10. Donor site discomfort was minimal and limited to the time of dressing change. There were no wound-related complications. The average cost of dressing supplies was $48.00 per patient and $23.00 per dressing. This method of managing STSG donor sites allowed for unimpeded reepithelialization without wound complication. The bio-occlusive dressing eliminated the pain typically associated with fine mesh gauze dressings. The absorptive property of the calcium sodium alginate eliminated the problem of seroma formation and leakage seen routinely with the use of a bio-occlusive dressing alone. These results confirm that this technique is both efficacious and cost-effective.     

Effect of artificial dermal substitute, cultured keratinocytes and split thickness skin graft on wound contraction

In this study, the effect of different wound treatments on contraction was evaluated in an established porcine model. In two separately conducted experiments full thickness wounds treated with artificial dermal substitute, split thickness skin graft (STSG), meshed STSG applied in combination with cultured keratinocytes or meshed STSG alone were compared with untreated wounds. The surface area of all wounds was quantified at regular time intervals. After 20 days wounds from some groups were subjected to histological analysis to establish the degree of epithelialization. Wounds treated with STSG contracted more than with artificial dermal substitute until day 21. From day 21 to day 35 wounds treated with STSG showed the least contraction. Wounds sprayed with cultured keratinocytes demonstrated a slower rate of contraction than those with meshed STSG alone after 20 days. The untreated control wounds showed a greater rate of contraction and had almost closed by day 20. This study demonstrates that there is a significant difference in contraction between wounds treated with artificial dermal substitute and control wounds and between wounds treated with STSG with cultured keratinocytes and meshed STSG alone. STSG with cultured keratinocytes, unmeshed STSG, and artificial dermal substitute all reduced wound contraction significantly.     

Use of porcine acellular dermal matrix as a dermal substitute in rats

OBJECTIVE: To examine porcine acellular dermal matrix (ADM) as a xenogenic dermal substitute in a rat model. SUMMARY BACKGROUND DATA: Acellular dermal matrix has been used in the treatment of full-thickness skin injuries as an allogenic dermal substitute providing a stable wound base in human and animal studies. METHODS: Xenogenic and allogenic ADMs were produced by treating porcine or rat skin with Dispase and Triton X-100. Full-thickness skin defects (225 mm2) were created on the dorsum of rats (n = 29), porcine or rat ADMs were implanted in them, and these were overlain with ultrathin split-thickness skin grafts (STSGs). In two adjacent wounds, 0.005- or 0.017-inch-thick autografts were implanted. In other experiments, the antimicrobial agent used during ADM processing (azide or a mixture of antibiotics) and the orientation of the implanted ADM (papillary or reticular side of ADM facing the STSG) were studied. Grafts were evaluated grossly and histologically for 30 days after surgery. RESULTS: Significant wound contraction was seen at 14, 20, and 30 days after surgery in wounds receiving xenogenic ADM, allogenic ADM, and thin STSGs. Contraction of wounds containing xenogenic ADM was significantly greater than that of wounds containing allogenic ADM at 30 days after surgery. Graft take was poor in wounds containing xenogenic ADM and moderately good in those containing allogenic ADM. Wound healing was not significantly affected by the antimicrobial agent used during ADM preparation or by the ADM orientation. CONCLUSION: Dispase-Triton-treated allogenic ADM was useful as a dermal substitute in full-thickness skin defects, but healing with xenogenic ADM was poor.     

The use of MatriDerm in early excision and simultaneous autologous skin grafting in burns--a pilot study

The application of dermal substitutes in deep partial and full-thickness burn wounds in a two-stage procedure prior to skin grafting has become increasingly popular. Synchronous application of dermal substitutes and skin graft has not yet been established as a standard procedure. In a consecutive study 20 wounds in 10 patients with severe burns (age 49.5+/-16.2 years; TBSA 45.6+/-14.5%) were treated with either simultaneous transplantation of Matriderm, a bovine based collagen I, III, V and elastin hydrolysate based dermal substitute and split-thickness skin grafting (STSG), or STSG alone after appropriate excision of the burn wound. The study was designed as a prospective intra-individual comparative study. After 1 week all wounds were assessed for the percentage of autograft survival. Autograft survival was not altered by simultaneous application of a dermal matrix (p=0.015). Skin elasticity was measured after 3-4 months with the Vancouver Burn Skin Score (VBSS). The VBSS demonstrated a significant increase of elasticity in the group with dermal substitutes (p=0.04) as compared with non-substituted wounds for sheet autograft, but not for meshed autograft (p=0.24). From this pilot study it can be concluded that simultaneous application of a dermal matrix is safe and feasible, yielding significantly better results with respect to skin elasticity. Skin elasticity was considerably improved by the collagen/elastin dermal substitute Matriderm in combination with sheet autograft.     

From skin allograft coverage to allograft–micrograft sandwich method: A retrospective review of severe burn patients who received conjunctive application of cultured epithelial autografts

A 12-year retrospective review of severe burn patients who received cultured epithelial autografts (CEA) at the Singapore General Hospital Burns Centre from January 2005 to December 2016 was carried out. During this period, two different surgical modalities were employed to manage these burn injuries. In the earlier period, following early excision of the burn wounds, exposed surfaces were covered with a combination of split thickness skin autografts (STSG) and allografts. Surfaces covered with skin allografts were subsequently debrided of the allo-epidermis in about 3 weeks later, exposing the allodermis with granulating tissues for grafting of CEA; a technique known as the Cuono’s method. In the later period, allograft–autologous micrograft sandwich technique was used to graft on the early excised burns with subsequent CEA grafting. The former and latter groups represented by STSG/C (n = 10) and M/CEA (n = 14) respectively, were compared in terms of clinical profiles, outcomes, allograft/CEA usage and total graft cost. No significant differences were found based on mean age and presence of inhalation burns between the two treatment methods However, percentage total body surface area (TBSA) and Revised Baux Score were significantly higher (p < 0.05) in the M/CEA group compared to the STSG/C group. Differences in clinical outcomes of mortality and length of hospital stay between the 2 groups were statistically insignificant. The average area amount of skin allografts used per patient in the M/CEA group was significantly lower compared to the STSG/C method group which contributed to lower total average cost of grafts used per % TBSA in the M/CEA method group. This might be attributed to the presence of micrografts which seemed to improve stabilization of the wound bed resulting in less operating procedures and improving CEA take. To conclude, the M/CEA method introduced was able to treat more severe burn patients at lower graft costs without compromising critical clinical outcomes significantly.     

猪脱细胞真皮与自体皮复合移植的临床应用及远期疗效

目的 了解异种脱细胞真皮基质与自体皮复合移植修复深度创面的临床效果,并进行不同时期随访及组织学观察. 方法 2000年2月-2003年7月,采用猪脱细胞真皮基质与自体刃厚皮二步复合移植法修复深度创面152例.观察移植后1周的皮片成活率及移植后1、3、6、12个月瘢痕增生情况;5例患者在移植72个月后取该部位样本进行组织学检查,其中2例进行透射电镜观察.对本组患者进行不同时期随访并与自身其他部位其他移植方式比较. 结果 创面植皮完全成活者116例占76.3%,95%以上成活者36例占23.7%,无一例补充植皮.1个月后随访到127例患者,可见移植局部有轻度挛缩,皮片连接处有条索状瘢痕,质地比较柔软,无明显瘙痒或起疱.3个月随访到101例,见复合移植物有轻度挛缩,但与刃厚皮移植部位比较明显减轻,关节功能良好.6个月随访到82例,复合移植皮肤颜色、质地接近正常,瘢痕增生不明显.12个月随访到58例,移植皮肤接近正常,未见明显排异现象.72个月以上随访到16例,移植局部稍显干燥,无其他异常.组织学观察结果提示:移植部位组织结构与正常皮肤基本一致,真皮支架中可见不完整的小汗腺及参与汗腺组成的细胞. 结论异种脱细胞真皮基质与自体刃厚皮复合移植,可以与人体局部组织长期共存,无明显排异反应.不完整小汗腺及汗腺细胞的出现,可能成为皮肤功能重建中新的关注点.     

Accelerated epithelialization and improved wound healing metrics in porcine full‐thickness wounds transplanted with full‐thickness skin micrografts

Split‐thickness skin grafting (STSG) is the current gold standard for treatment of extensive burn and traumatic skin injuries. However, STSG is limited by donor‐site morbidity and availability, and often leads to scarring and wound contracture. Furthermore, these thin grafts lack dermal elements such as nerves and adnexa which are important in recapitulating normal skin function. Methods of fractional skin replacement either as minced STSGs or microscopic skin tissue columns have been proposed, though these techniques have not been fully characterized and lack evidence of regenerated adnexal structures. Here, we describe an alternative method of fractional skin replacement using full‐thickness skin micrografts containing deep dermal components and intact adnexa. Full‐thickness wounds measuring 3 cm in diameter and 2 cm apart were created on adult female Yorkshire swine. Full‐thickness skin tissue columns (FTSTCs) 1.5 mm in diameter with intact adnexa and subcutaneous tissue were obtained using a suction‐assisted device. Explant culture was initiated to demonstrate the capacity of FTSTCs to act as reservoirs of viable and proliferative epidermal and dermal cells. FTSTCs were applied directly to excisional wounds at three different expansion ratios (1:16, 1:40, 1:100) in fibrin sealant. Biopsies were collected at defined time points postwounding and processed for histology and immunohistochemistry. Wounds grafted with FTSTCs showed enhanced reepithelialization and epidermal differentiation over untreated control wounds in a dosage dependent manner. Adnexal structures such as hair follicles and sweat glands were only evident in FTSTC‐treated wounds. Furthermore, whereas ungrafted wounds were marked by extensive infiltration of α‐Smooth Muscle Actin⁺ (α‐SMA⁺) myofibroblasts at POD 60, α‐SMA expression was sparse and largely limited to perivascular cells in FTSTC‐treated wounds. The number of Ki67⁺ cells was also greatly reduced in FTSTC‐treated wounds. Transplantation of FTSTCs containing intact adnexa improved wound healing parameters in porcine full‐thickness wounds and may have implications for the treatment of large, traumatic wounds.     

The use of glycerol-preserved allografts in the Beverwijk Burn Centre: a retrospective study

This report describes 156 consecutive patients treated with glycerol-preserved allograft skin (GPA) in the Beverwijk Burn Centre between January 1996 and July 2001. Patients with burn and non-burn lesions are included. Age varied from 7 months to 90.7 years. Four different procedures have been identified: (1) sandwich grafting technique; (2) treatment of partial-thickness burns with GPA as a membranous dressing; (3) improvement of wound condition; (4) scar release: a temporary coverage of release incisions with allograft skin to improve the wound bed and to benefit further relaxation of the wound primary to autografting. The main points of interest in this inventory are the results of treatment, the aetiology and the extent of the wounds treated with GPA, the day post injury the GPA treatment was started, the duration of the treatment, the number of allograft applications, the occurrence of wound infection and wound treatment before GPA application. Concerning the scar release an inventory was made of the anatomic sites that were involved. Sandwich grafting, which is the treatment of choice at this centre for extensive, full-thickness injuries, was performed on 129 wounds. The average burn size in all 70 patients treated was 35.6% TBSA with 26.9% full thickness. In all cases meshed GPA was used. Partial or complete healing was achieved in 57.6% of wounds. In the treatment of partial-thickness burns, non-meshed GPA was used in all 57 cases. Complete healing without further treatment was achieved in 45.6% of the cases. Excision and autologous skin grafting was needed in 26.3% of the cases. Meshed GPA was used to improve the condition of 88 non-healing wounds. Spontaneous healing was promoted in 13.6% of the wounds, and the wound bed was successfully prepared for autografting in 39.8% of the cases. In all 52 scar releases a viable wound bed was obtained prior to autografting. Autologous graft take was 100% and no autologous re-grafting was necessary. Allografts in the popliteal space were changed most frequently.     

Involvement of Keratinocyte Activation Phase in Cutaneous Graft Healing: Comparison of Full-Thickness and Split-Thickness Skin Grafts

BACKGROUND: Little is known about keratinocytic activation in the graft take and healing process. OBJECTIVE: To investigate the clinical and molecular differences between pure epidermal sheet graft (PESG), split-thickness skin graft (STSG), and full-thickness skin graft (FTSG). METHODS: Three different thickness skin grafts (PESG, STSG, and FTSG) were performed onto three kinds of porcine wounds: shallow, deep, and full. Graft take, contraction, and Ki-67 and beta1 integrin expression in epidermis were studied. RESULTS: All grafts took well. As expected, full wounds covered by PESG and STSG contracted more than those covered by FTSG, whereas shallow wounds covered by FTSG contracted more than those covered by STSG. No difference in contracture was observed among deep wounds covered by PESG, STSG, and FTSG. Up-regulation of Ki-67 and beta1 integrin expression was greater in PESG and STSG, compared with little expression in FTSG. CONCLUSION: The keratinocytic activation phase may occur both in the STSG and PESG healing process, as well as serum imbibition, inosculatory, and revascularization phases.     

Dermal substitution with Matriderm in burns on the dorsum of the hand

Background

Dermal substitutes are used increasingly in deep partial and full-thickness burn wounds in order to enhance elasticity and pliability. In particular, the dorsum of the hand is an area requiring extraordinary mobility for full range of motion. The aim of this comparative study was to evaluate intra-individual outcomes among patients with full-thickness burns of the dorsum of both hands. One hand was treated with split-thickness skin grafts (STSG) alone, and the other with the dermal substitute Matriderm^® and split-thickness skin grafts.

Material and Methods

In this study 36 burn wounds of the complete dorsum of both hands in 18 patients with severe burns (age 45.1 ± 17.4 years, 43.8 ± 11.8% TBSA) were treated with the simultaneous application of Matriderm^®, a bovine based collagen I, III, V and elastin-hydrolysate based dermal substitute, and split-thickness skin grafting (STSG) in the form of sheets on one hand, and STSG in the form of sheets alone on the other hand. The study was designed as a prospective comparative study. Using both objective and subjective assessments, data were collected at one week and 6 months after surgery. The following parameters were included: After one week all wounds were assessed for autograft survival. Skin quality was measured 6 months postoperatively using the Vancouver Burn Skin Score (VBSS). Range of motion was measured by Finger-Tip-Palmar-Crease-Distance (FPD) and Finger-Nail-Table-Distance (FNTD).

Results

Autograft survival was not altered by simultaneous application of the dermal matrix (p > 0.05). The VBSS demonstrated a significant increase in skin quality in the group with dermal substitutes (p = 0.02) compared to the control group with non-substituted wounds. Range of motion was significantly improved in the group treated with the dermal substitute (p = 0.04).

Conclusion

From our results it can be concluded that simultaneous use of Matriderm^® and STSG is safe and feasible, leading to significantly better results in respect to skin quality of the dorsum of the hand and range of motion of the fingers. Skin elasticity was significantly improved by the collagen/elastin dermal substitute in combination with sheet-autografts.     

硝普钠和磺胺嘧啶银联合应用对大鼠深Ⅱ度烧伤创面愈合的影响

目的：研究硝普钠、磺胺嘧啶银及二者合用对深Ⅱ度烧伤皮肤创面愈合的影响。方法：100只WiStar大鼠背部深Ⅱ度烧伤创面,随机分成0．9％氯化钠注射液组、1％磺胺嘧啶银霜组、lmmol／L硝普钠组和1％磺胺嘧啶银霜＋lmmol／L硝普钠组。每组25只大鼠。动态观察烧伤后不同时间点创面细胞增殖周期、羟脯氨酸含量及创面组织愈合情况,计算创面愈合率。结果：伤后随时间推移磺胺嘧啶银霜＋硝普钠组创面愈合率高于其他三组;伤后第10天,磺胺嘧啶银霜＋硝普钠组创面羟脯氨酸含量、细胞S期百分比达到峰值,明显高于0．9％氯化钠注射液（P〈O．01）,磺胺嘧啶银霜组、硝普钠组之间比较无显著差异（P〉0．05）。结论：磺胺嘧啶银霜和硝普钠合用可有效促进大鼠深Ⅱ度烧伤创面愈合。     

Effectiveness of negative pressure closure in the integration of split thickness skin grafts: a randomized, double-masked, controlled trial

OBJECTIVES: To determine the effectiveness of the negative pressure closure (NPC) technique in the integration of split-thickness skin grafts (STSG) to the recipient site. METHODS: Randomized, double-masked, controlled trial. Setting: A tertiary burn unit. Patient characteristics: Between May 2003 and October 2004, 60 patients having wounds with skin loss which hindered primary closure, were incorporated to this study. We excluded patients with > or =20% of total body surface burns, polytraumatized, surgical contraindications, those who were enlisted in other clinical trials, and those who rejected the informed consent. Interventions: In all the patients, surgical cleaning of the recipient site and STSG were performed after which they were randomly assigned between 2 groups: a group that received a NPC dressing and were connected to the central aspiration system at -80 mm Hg versus a control group with similar dressing but without connection to negative pressure. Loss of STSG area at the fourth postoperative day, days of hospital stay. RESULTS: Sixty patients were included. The median loss of the STSG in the NPC group was 0.0 cm versus 4.5 cm in the control group (P = 0.001). The median hospital stay was of 13.5 days in the NPC group versus 17 days in the control group (P < 0.001). CONCLUSIONS: The use of NPC significantly diminishes the loss of STSG area, as well as shortens the days of hospital stay. Therefore, it should be routinely used for these kinds of procedures.     

Demonstration of the safety and effectiveness of the RECELL® System combined with split-thickness meshed autografts for the reduction of donor skin to treat mixed-depth burn injuries

IntroductionSplit-thickness skin grafts (STSG) are the standard of care (SOC) for burns undergoing autografting but are associated with donor skin site morbidity and limited by the availability of uninjured skin. The RECELL^® Autologous Cell Harvesting Device (RECELL^® System, or RECELL) was developed for point-of-care preparation and application of a suspension of non-cultured, disaggregated, autologous skin cells, using 1 cm² of the patient’s skin to treat up to 80 cm² of excised burn.MethodsA multi-center, prospective, within-subject controlled, randomized, clinical trial was conducted with 30 subjects to evaluate RECELL in combination with a more widely meshed STSG than a pre-defined SOC meshed STSG (RECELL treatment) for the treatment of mixed-depth burns, including full-thickness. Treatment areas were randomized to receive standard meshed STSG (Control treatment) or RECELL treatment, such that each subject had 1 Control and 1 RECELL treatment area. Effectiveness measures were assessed and included complete wound closure, donor skin use, subject satisfaction, and scarring outcomes out to one year following treatment.ResultsAt 8 weeks, 85% of the Control-treated wounds were healed compared with 92% of the RECELL-treated wounds, establishing the non-inferiority of RECELL treatment for wound healing. Control-treated and RECELL-treated wounds were similar in mean size; however, mean donor skin use was significantly reduced by 32% with the use of RECELL (p < 0.001), establishing the superiority of RECELL treatment for reducing donor skin requirements. Secondary effectiveness and safety outcomes were similar between the treatments.ConclusionsIn combination with widely meshed STSG, RECELL is a safe and effective point-of-care treatment for mixed-depth burns without confluent dermis, achieving short- and long-term healing comparable to standard STSG, while significantly decreasing donor skin use.     

A randomised clinical trial comparing a hydrocolloid-derived dressing and glycerol preserved allograft skin in the management of partial thickness burns

Membranous dressings for the treatment of partial and mixed thickness burns are among the most innovative and promising new developments of the last years. In this study, we present data of a randomised prospective comparative study on a carboxymethylcellulose based dressing, Hydrofibre((R)) and glycerolized human allograft skin.In a 2 year period, 80 patients (40 for each material) were enrolled in the trial. Study wounds (<10% TBSA) that had not re-epithelialised after 14+/-3 days were debrided and grafted or, if small enough, managed with a topical antimicrobial agent. Mean total TBSA was 8.3+/-5.2%, study burn 3.7+/-2.0% for the Hydrofibre((R)) group and 7.3+/-4.3% total, 3.4+/-2.1% study burn for the allograft skin group (n.s. Wilcoxon rank sum test). No significant differences between groups were established in number of patients with superficial/deep burns.In both groups about 2/3 of the patients healed completely with the dressings applied (24/40 versus 27/40 for Hydrofibre((R)) versus allograft skin, respectively). However, a higher incidence of post-study excision and grafting was found in the Hydrofibre((R)) group (45% versus 15% in the allograft skin group, P=0.004, Mann-Whitney). At 10 weeks follow-up no significant differences were seen in scar colour, pigmentation, pliability, height or itching (Vancouver Scar Scale). Skin elasticity, measured by the Cutometer((R)), was significantly better for the allograft group (P=0.010, Wilcoxon). These differences were no longer found at 6 months and 1 year follow-up. Incidence of hypertrophy after 6 months was higher, but not significantly, in the Hydrofibre((R)) compared to the allograft skin group (52.5% versus 30%, P=0.09, chi-square).In view of the results from our comparative study on Hydrofibre((R)) versus allograft skin, we prefer the use of allograft skin for the category of larger burns of mixed depth, usually presented to burn centres. However, for partial thickness and small burns Hydrofibre((R)) can be the first choice in treatment.     

紫外线预照射猪皮覆盖自体微粒皮治疗深度烧伤临床分析

目的探讨紫外线预照射猪皮覆盖自体微粒皮治疗深度烧伤的临床疗效。方法67例深Ⅱ度以上烧伤患者,随机分为实验组（35例）和对照组（32例）,实验组的烧伤创面覆盖的猪皮预先经40 W紫外线预照射2 h,对照组烧伤创面所覆盖的猪皮未经紫外线照射,比较两组烧伤创面的愈合效果。结果实验组烧伤创面平均愈合时间（28.4±2.2）d,显著少于对照组的（35.8±2.5）d,创面感染率低于对照组（20.0%vs.43.7%）,而创面Ⅰ类愈合率高于对照组（80.0%vs.56.2%）（P〈0.05）。结论紫外线预照射猪皮覆盖自体微粒皮用于深度烧伤创面能显著加快创面愈合。