Experimental Burn Model Research Articles

Wound Healing Activity of Two Honeys from the Southern Regions of Senegal (Casamance)

Aim: The aim of this study was to evaluate the healing activity of two honeys from Casamance (Senegal) in a second-degree experimental burn model in the Wistar strain rat. Methodology: Experimental burns were induced using a metal cylinder 3 cm in diameter and heated for 5 min. The cylinder was applied for 20 seconds, pressing lightly on the surface of the rats' shaved skin to induce second-degree burns. Results: The daily application of honey induces a healing dependent on concentration and typology. The healing rate is higher with AF, with a score of 0.60 ± 0.48 vs 1.00 ± 0.00 for MZ which induces almost complete tissue repair after 21 days of treatment. Conclusion: The results of this study demonstrate the use of traditional honey in wound healing and burns.

Experimental burn models for evaluating wound healing agents and its current situation and existing disadvantages: a literature review

BACKGROUND: Burns remain a crucial part of the structure of injuries in Russia and abroad. Therefore, providing high-quality medical care to burn victims is relevant. Despite the large number of proposed solutions to this condition, developments in the field of tissue engineering and medical materials science still lack standardization and consideration of specific features of animal burn models for their testing. Many studies showed minor and major disadvantages from a technical and descriptive point of view. AIM: To analyze and identify the main disadvantages of existing burn models to assess the effect of wound healing agents. MATERIALS AND METHODS: This article examines the search results in the databases Google Scholar and PubMed using the keywords “burns,” “rats,” “animal model,” and “wound healing.” Sixty publications were analyzed. RESULTS: Seven quality criteria for the animal burn model have been determined, which allow obtaining reliable results and reproducing the described experiment: indication of the terms of quarantine and conditions of keeping laboratory animals, detailed description of the technique of applying burn injury, presence of one burn on a laboratory animal, presence of a control biopsy, indication of the absolute value of the initial burn area, presence of surgical treatment of burn wounds, and correct use of formulas for the planimetric assessment of wound healing. CONCLUSIONS: A solution to the problem of creating a standardized model may be a more detailed description of techniques and following the proposed quality criteria.

109 Effects of Fat-Rich Nutrients in the Pancreas of an Experimental Burn Model

Abstract Introduction Oversupply of nutrients overstimulates beta cells in standard conditions, and severe burn injuries increase the metabolic needs. In this study, we investigated the effects of fat-rich nutrients on the endocrine pancreas during the acute phase of severe burns. Methods Twenty-one Wistar albino rats were randomly divided into 3 groups. Two groups were fed with standard commercial rat chow (1 with sham procedure and 1 with burn procedure), and the third group (also with burn procedure) was fed a fat-rich diet (60% kcal fat). The burn procedure involved a 25% total body surface area fullthickness burn. Blood samples were taken at 36 hours and 7 days after burn injury or sham procedure. On postburn day 7, skin biopsies were taken and a pancreatectomy was performed. Pancreatic tissues were examined under light microscopy; islets size and cellularity were calculated and investigated immunohistochemically. Results Plasma glucose, C-Peptide, and insulin levels were similar in all the study groups 36 hours and 7 days after burn induction or sham procedure. There was a significant increase in the number of cells per one islet in the burn group given a fat-rich diet compared with the other groups (P = .05). Caspase-3 was strongly expressed in both groups with burn injuries. Conclusions Overconsumption of certain fats can lead to a compensatory response by beta cells that eventually can progress to beta-cell dysfunction during the acute phase of burns. Severe burns induce pancreatic islet cell hyperplasia. Providing excessive fat nutrients during the acute postburn period attenuates this response. Despite the morphophysiological changes observed in the pancreas, all animals in our study achieved similar glycemic homeostasis. Applicability of Research to Practice The delivery of nutritional support is a vital element of burn care, and the main goal is simply to avoid nutritional complications. Lipotoxicity contributes to multisystem organ failure and worse clinical outcomes in obese patients and mice with pancreatitis. Neutralization of IL-1β produces beneficial effects on postburn glycemic control and improves survival. apoptosis in the pancreas of patients with severe burns may be linked to a series of events that can induce Caspase-1 activation and IL-1β release, and these pathways may be influenced by the nutritional status, especially in the early postburn phase. Effective nutritional assessment and management can optimize wound healing and decrease complications and mortality.

Psalmotoxin-1 Venom on the Inflammatory Response and Burn Healing Process in the Experimental Burn Model

Psalmotoxin-1 Venom on the Inflammatory Response and Burn Healing Process in the Experimental Burn Model

The Effect of Udenafil on Stasis Zone in an Experimental Burn Model.

Management of the burn injuries is still a problematic issue because the stasis zone may become necrotic. We hypothesized that udenafil, a potent phospodiesterase inhibitor, can be beneficial in burn treatment by enhancing the viability of the stasis zone. Fifteen Wistar rats were randomly divided into 3 groups. Comb burn injury model was conducted bilaterally on the back of rats in each subject. Group 1 received 1 mL/d of saline orally for 7 days. Group 2 received 10 mg/kg per day of udenafil for 7 days. Group 3 received 20 mg/kg per day of udenafil for 7 days. At the end of seventh day, gross morphological and histopathological samples of stasis zone survival were evaluated. Histopathological examination of groups 2 and 3 revealed that the stasis zone was mostly viable. The mean necrotic area and severity of inflammation was significantly higher in the control group compared with the treatment groups. Significant differences were determined in treatment groups compared with control group in terms of vital stasis zone area and histopathological parameters. Udenafil treatment improved tissue survival on zone of stasis in. Future experimental studies should be conducted to develop zone of stasis treatment protocols combining udenafil with potent anti-inflammatory and antioxidant drugs.

Experimental Models for Controlled Burn Injuries in Rats: A Systematic Analysis of Original Methods and Burn Devices.

Despite a wide variety of models found in literature, choosing the right one can be difficult as many of them are lacking precise methodology. This study aims to analyze and compare original burn models in terms of burn device and technique, parameters, and wound depth assessment. A systematic search was performed according to PRISMA guidelines on studies describing original experimental burn models in rats. The adapted PICO formula and ARRIVE checklist were followed for inclusion and assessment of quality of studies. Characteristics of animals, burn technique, burn parameters, and method of histological confirmation of burn depth were recorded. Twenty-seven studies were included in the final analysis. Most studies used direct contact with skin for burn infliction (n = 20). The rat's dorsum was the most common site (n = 18). Ten studies used manually controlled burn devices, while 10 designed automatic burn devices with control over temperature (n = 10), exposure time (n = 5), and pressure (n = 5). Most studies (n = 7) used a single biopsy taken from the center of the wound to confirm burn depth immediately after burn infliction. From the wide variety of burn models in current literature, our study provides an overview of the most relevant experimental burn models in rats aiding researchers to understand what needs to be addressed when designing their burn protocol. Models cannot be compared as burn parameters variate significantly. Assessment of burn depth should be done in a standardized, sequential fashion in future burn studies to increase reproducibility.

Efficacy of Acupuncture on Pain Mechanisms, Inflammatory Responses, and Wound Healing in the Acute Phase of Major Burns: An Experimental Study on Rats.

We investigated acupuncture, a potential contributor for burn care, on physiological and pathological pain mechanisms and systemic and local inflammatory responses in a rat experimental burn model. Forty male Sprague-Dawley rats were divided into two groups. One-hour groups (five rats/group) were observed for 1 hour and included Sh1 (sham/observation), ShA1 (sham + acupuncture/observation), Brn1 (burn/observation), and BrnA1 (burn + acupuncture/observation). Seven-day groups (five rats/group) were observed for 7 days and included Sh7 (sham/observation), ShA7 (sham + acupuncture/observation), Brn7 (burn/observation), and BrnA7 (burn + acupuncture/observation). "Pain-distress scores" were noted daily, and acupuncture was repeated within every wound-dressing change on alternate days. After observation periods, blood samples for interleukin 6 and beta-endorphin and skin biopsies for inflammatory changes and immunohistochemical staining of interleukin 6 were collected for analysis(P < .05). In 1-hour groups, interleukin 6 accumulation in burn wounds of BrnA1 was less than Brn1, with Brn1 having the highest mean blood level (P < .05). Mean beta-endorphin levels were higher in ShA1, Brn1, and BrnA1 than in Sh1 (P < .05). In all 7-day groups, the agonizing period was 48 to 72 hours after burn, with Brn7 most affected (P < .05). Microvessels were multiplied in the Brn7 group, with significantly higher numbers in burn wounds of BrnA7 (P ˂ .05). Burn wounds of BrnA7 had less accumulation of interleukin 6 than Brn7 with the Brn7 group having the highest mean blood level and Sh7, ShA7, and BrnA7 having similarly low levels (P ˃ .05). Beta-endorphin levels in ShA7, Brn7, and BrnA7 were lower than in Sh7 (P < .05). Acupuncture contributed to the management of physiological and pathological pain, modulation of inflammatory responses, and associated enhancement of angiogenesis in the acute phase of burn injury in rats.

Recent Advances in Experimental Burn Models.

Simple SummaryHuman burns are diverse and the most difficult injuries to study in clinical settings. Numerous experimental burn models designed to study and compare different aspects of burns and their consequences and treatment are steadily progressing. This review summarizes the latest advances in experimental burn research as a guide to aid in the future design of studies.Experimental burn models are essential tools for simulating human burn injuries and exploring the consequences of burns or new treatment strategies. Unlike clinical studies, experimental models allow a direct comparison of different aspects of burns under controlled conditions and thereby provide relevant information on the molecular mechanisms of tissue damage and wound healing, as well as potential therapeutic targets. While most comparative burn studies are performed in animal models, a few human or humanized models have been successfully employed to study local events at the injury site. However, the consensus between animal and human studies regarding the cellular and molecular nature of systemic inflammatory response syndrome (SIRS), scarring, and neovascularization is limited. The many interspecies differences prohibit the outcomes of animal model studies from being fully translated into the human system. Thus, the development of more targeted, individualized treatments for burn injuries remains a major challenge in this field. This review focuses on the latest progress in experimental burn models achieved since 2016, and summarizes the outcomes regarding potential methodological improvements, assessments of molecular responses to injury, and therapeutic advances.

Wound healing effect of “Prolidoxid” and “Dexpanthenol with ceramides”: a сomparative study based on the model of chemical burns with expressed alterative skin processes

Pharmacotherapy of chemical skin injuries remains an urgent issue today due to its serious health consequences and possible development of complications. Topical treatment is one of the most effective methods of wound treatment using hydrophilic ointments and creams. For now, range of hydrophilic medicinal products with a broad spectrum of action is limited. That is why a search and development of new hydrophilic ointments and creams remains an urgent challenge.&#x0D; The aim. The aim of this research was to study effectiveness of ointment “Prolidoxid” and cream “Dexpanthenol with ceramides” on the experimental chemical burn model in rats.&#x0D; Materials and methods. Wound healing effect of ointment “Prolidoxid” and cream “Dexpanthenol with ceramides” was proved by the study of planimetric and hematological parameters on the model of acetic acid burns in rats.&#x0D; Results. Using animal model of chemical burns it was found that ointment “Prolidoxid” and cream “Dexpanthenol with ceramides” accelerate wound healing on Day 5 and Day 6, consequently, compared to untreated control animals, but in comparison with the action of reference medicine wounds were healed two days faster. Hematological parameters showed that studied medicines inhibit inflammation and reactivate blood rheological properties.&#x0D; Conclusions. The results suggest that effectiveness of cream “Dexpanthenol with ceramides” is higher than for one-component cream “Dexpanthenol”, but ointment “Prolidoxid” exceeds therapeutic action of ointment “Wundahyl” as reported by hematological and planimetric parameters

134 The Effect of Adipose Derived Stromal Vascular Fraction on Stasis Zone in an Experimental Burn Model on Streptozocin – Induced Diabetic Rats

Abstract Introduction Stasis zone is the encircling area of the coagulation zone which is a critical area determining the depth and width of the necrosis in burn patients. In our study we aim to salvage the stasis zone by injecting adipose derived stromal vascular fraction (ADSVF). Methods Intraperitoneal Streptozotocin was administered for the induction of diabetes mellitus (DM) and the development of DM was confirmed by the measurement of blood glucose levels in the blood samples with blood glucometer weekly 48 hours after injection. Rats with blood glucose levels above 200 mg/dl were accepted as diabetic. The diabetic animals were followed for 4 weeks before the intervention. Thermal injury was applied on dorsum of diabetic Sprague – Dawley rats (n=20) according to the previously described ‘‘comb burn’’ model. After the burn injury (30 minutes) on Sprague - Dawley rats; rat dorsum was separated into 2 equal parts consisting of 4 burn zones (3 stasis zone) on each pair. ADSVF cells harvested from inguinal fat pads of diabetic Sprague - Dawley rats (n=5) were injected on the right side while same amount of phosphate buffered saline (PBS) injected on the left side of the same animal. One week later, average vital tissue on the statis zone was determined by macroscopy, angiography and microscopy. Vascular density, inflammatory cell density and gradient of fibrosis were determined via immunohistochemical assay. Results Macroscopic stasis zone tissue survivability percentage (32 ± 3.28 %, 57 ± 4.28 %), average number of vessels (10.28 ± 1.28, 19.43 ± 1.72), capillary count (15.67 ± 1.97, 25.35 ± 2.15) and vascular density (1.55 ± 0.38, 2.14 ± 0.45) were higher on ADSVF side. Fibrosis gradient (1.87 ± 0.51, 1.50 ± 0.43) and inflammatory cell density (1.33 ± 0.40, 1.20 ± 0.32) were higher on the PBS side. Conclusions Macroscopic and microscopic findings determined that ADSVF has a statistically significant benefit for salvaging stasis zone on acute burn injuries in DM.

Comparison of the Effects of Stem Cell, Platelet Rich Plasma and Ovarian Follicle Fluid on Burn Stasis Zone (Experimental Study)

Objective: The basic aim in the treatment of second-degree burns is to prevent progressive cell death, and so treatments are directed at the zone of stasis. In this study, We were aimed to investigate the healing effects of using Mesenchymal Stem Cells (MSCs), Ovarian follicular fluid (OFS) and Platelet-rich plasma (PRP) on burn stasis zone in an experimental burn model. Method: Forty rats were divided randomly into four groups. Burns were created in each group according to the comb burn model. The control group received no treatment; the mesenchymal stem cell [MSC] group received MSC; the platelet-rich plasma [PRP] group received PRP; and the ovarian follicular fluid [OFF] group received OFF subcutaneously on days 1, 3 and 5. On days 1 and 21, all rats were photographed and the burn sites were calculated. At the end of day 21, all rats were sacrificed, the dorsum containing the created burns were excised, and the epithelialization, collagen amount, fibroblast density, inflammatory cell density and VEGF amounts were evaluated histopathologically. Results: The groups were assessed based on the burn site healing rate and histopathological scoring. Healing was faster in the MSC group [p<0.005], PRP group [p>0.005] and OFS group [p<0.005] than in the control group. When the treatment groups were compared with each other, the best healing was observed in the MSC, PRP and OFF groups, respectively. Conclusions: MSC, PRP and OFF were found to have a positive effect on burn healing, with MSC being the most efficient method among the three, followed by PRP and OFF, respectively, which were found to provide a faster healing than the control group.

Bacterial Translocation Relationship with Enteral L-Glutamine and L-Alanine in Experimental Rat Burn Model

Introduction and Objective: The aim of this experimental study is to research the effects of L-alanine and L-glutamine on liver, structural changes on small intestine, wound healing, and bacterial translocation which are being widely used on intensive care patients. Material and Method: 20 male Sprague Dawley rats which weigh 190-230 gr used in this study. Rats separated into two randomized groups. In accordance with experimental rat burn model, skin burn was created in every rat and both groups are fed equally for 21 days. Experimental group administered L-glutamine+L-alanine containing product (Dipeptiven®, Fresenius Kabi BadHamborg, Germany) for 5 ml/kg/day orally. At the end of 21st day all rats were sacrificed. Biopsy materials obtained from liver, small intestine, and burn wound and blood culture was taken under sterile conditions. In pathologic examination structural changes in tissues and wound healing was evaluated. In microbiologic examination, effects of L- glutamine and L-alanin on bacterial translocation are evaluated by comparing small instestine and blood cultures. Results: No structural difference was seen among small intestine biopsies between two groups. No liver damage was seen in experimental group while live biopsies showed grade 1 damage in control group. Epitelization and granulation was detected as better in pathologic examination of skin biopsies obtained from burn wound showed better in experimental group. Microbiologic examination showed bacterial replication in total of 4 rats from control group, two rats showed replication of S.aures in small intestine and blood culture and two rats showed replication of S. epidermidis in small intestine and blood culture. No replication was determined in any rats from experimental group. Conclusion: In the light of findings acquired from this study done with experimental rat burn model, we think that use of L-glutamine+L-alanin will have positive effects on wound healing and helps preventing the bacterial translocation in burn patients as a supporting product.Giris ve Amac: Bu deneysel calismanin amaci, yogun bakim hastalarinda siklikla kullanilan L-alanin+ L-glutaminin, karaciger, ince bagirsaktaki yapisal degisikliklere etkisi, yara iyilesmesine etkisi ve bakteriyel translokasyona etkisinin arastirilmasidir. Materyal ve Metod : Bu calismada 190-230 gr olan 20 adet erkek Sprague Dawley rat kullanildi. Deney, 2 grup uzerinde tasarlandi. Tum ratlarda, deneysel rat yanik modeline uygun olarak yanik olusturuldu ve her iki grup esit sartlarda 21 gun beslendi. Deney grubuna, 5ml/kg/gun L-glutamin+L-alanin iceren (Dipeptiven®, Fresenius Kabi BadHamborg, Almanya) preparat oral yolla verildi. 21 gunun sonunda tum ratlar sakrifiye edildi. Tum ratlardan steril sartlarda, karaciger, ince bagirsak, yanik yarasindan biyopsiler ve kan kulturleri alindi. Patolojik incelemede karaciger ve ince bagirsak dokularindaki yapisal degisiklikler ve yara iyilesmesi degerlendirildi. Mikrobiyolojik incelemede ince bagirsak ve kan kulturleri kiyaslayarak L- glutamin+L-alaninin bakteriyel translokasyona etkisi arastirildi. Bulgular : Iki grup arasinda ince bagirsak biyopsileri arasinda hicbir yapisal fark gorulmedi. Karaciger biyopsilerinde kontrol grubunda grade 1 hasarlanma mevcutken deney grubunda hasar tesbit edilemedi. Yanik yarasindan alinan cilt biyopsilerinin patolojik incelemesinde deney grubunda epitelizasyon ve granulasyonun daha iyi oldugu tesbit edildi. Mikrobiyolojik incelemede kontrol grubundaki iki ratin ince bagirsak ve kan kulturlerinde S.aureus, iki ratin ince bagirsak ve kan kulturlerinde de S.epidermidis olmak uzere toplamda dort ratta ureme tesbit edildi. Deney grubundaki hicbir ratin ince bagirsak ve kan kulturlerinde ureme olmadi. Sonuc: Deneysel rat yanik modelinde yapilan bu calismanin sonucunda elde ettigimiz verilere gore, L-glutamin+L-alanin kullaniminin, yanik hastalarinin yara iyilesmesine olumlu etkisi oldugu, ek olarak ta bakteriyel translokasyonu engell

A proline derivative-enriched methanol fraction from Sideroxylon obtusifolium leaves (MFSOL) stimulates human keratinocyte cells and exerts a healing effect in a burn wound model.

It was previously demonstrated that the methanol fraction of Sideroxylon obtusifolium (MFSOL) promoted anti-inflammatory and healing activity in excisional wounds. Thus, the present work investigated the healing effects of MFSOL on human keratinocyte cells (HaCaT) and experimental burn model injuries. HaCaT cells were used to study MFSOL's effect on cell migration and proliferation rates. Female Swiss mice were subjected to a second-degree superficial burn protocol and divided into four treatment groups: Vehicle, 1.0% silver sulfadiazine, and 0.5 or 1.0% MFSOL Cream (CrMFSOL). Samples were collected to quantify the inflammatory mediators, and histological analyses were performed after 3, 7, and 14 days. The results showed that MFSOL (50 μg/mL) stimulated HaCaT cells by increasing proliferation and migration rates. Moreover, 0.5% CrMFSOL attenuated myeloperoxidase (MPO) activity and also stimulated the release of interleukin (IL)-1β and IL-10 after 3 days of treatment. CrMFSOL (0.5%) also enhanced wound contraction, promoted improvement of tissue remodeling, and increased collagen production after 7 days and VEGF release after 14 days. Therefore, MFSOL stimulated human keratinocyte (HaCaT) cells and improved wound healing via modulation of inflammatory mediators of burn injuries.

SIRT1 suppresses burn injury-induced inflammatory response through activating autophagy in RAW264.7 macrophages

The present study sought to investigate the association between silent information regulator 1 (SIRT1) and autophagy during systemic inflammatory response syndrome following burn injury. The experimental burn model in mice...

Effects of Carnosine, Ankaferd, and Silver Sulfadiazine on an Experimental Burn Model: Roles of Irisin and HSP70

In this study, the effects of carnosine, ankaferd, and 1% silver sulfadiazine applied topically on second-degree burns were investigated and the roles of irisin and Heat shock protein 70 (HSP70) in this healing process were evaluated. Ninety male albino rats were used and divided into five groups. The groups were classified as control, burn, burn + carnosine (CAR), burn + ankaferd (ABS), and burn + silver sulfadiazine (SS). It was found that level of irisin increased in the first week and decreased in the second week in the burn and CAR groups. In the ABS and SS groups, the level of irisin was determined that started to increase in the first week and continued to increase in the second week. The level of HSP70 was found to increased in the first week in burn and CAR groups and decreased in the second week, but started to increase in the second week in ABS and SS groups. Both levels of irisin and HSP70 were observed to decreased in all treatment groups in the third week. In this study, it was shown that ankaferd and silver sülfadiazine treatments cause an increase in the irisin levels in the early period and a gradually increase in HSP70 levels in the later period in burns. The inflammatory response was observed to be limited in the early period in the ankaferd and sulfadiazin groups. It was concluded that these findings were effective in early wound healing in burns.

Effect of Nosocomial Burn Bacteria in Experimental Burn Model

In present study, mice burn model were used to study the complications of bacterial infected burn cases. Eighteen male albino mice were used as a burn model which divided into two mice groups burned by boiled water (scald method), then injected by physiological normal saline (negative control), two mice were infected by Pseudomonas aeruginosa 0.2 x 108 &nbsp;Colony Form Unit (CFU) without burn, on other hand two mice were infected by Staphylococcus aureus (0.2 x 108 CFU) without burn, these two groups considered as a positive control. Other mice divided into two groups, each one contains six mice burned and infected by nosocomial bacterial burn isolates (0.2 x 108 CFU), all groups were followed up for 7 days then killed and histopathological changes of some internal organs were examined, livers and lungs of &nbsp;examined samples showed significant pathological changes in coparision to the &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;negative control, suggesting that these samples suffered from variety degree of hepatitis and pneumonia. These results&nbsp; were due to the complications of bacteremia and septicemia of burned model.&nbsp;&nbsp;&nbsp;&nbsp

Investigation of acute effects of topical Alpinia officinarum (galangal) treatment in experimental contact type burns and comparison with topical silver sulfadiazine treatment.

It was aimed to determine whether Alpinia officinarum (AO) (galangal), which has been regarded to be effective on wound healing, is healing on experimental contact type burns and compare its effects with silver sulfadiazine (SSD). Thirty-five rats were divided into five groups of seven rats each group. Superficial second degree burns were formed by contacting a 1×1 cm copper tip which was kept at 100°C constant temperature to the three shaved areas on the back of rats without applying any pressure for 10 s. All groups were irrigated with a 100 cc saline solution for 2 min. Any procedure or treatment was not applied to Group I (Control). Group II (Burn Control) was only irrigated, Group III (SSD) was applied topical SSD 4 times, with 6-h intervals (at h 0, 6, 12 and 18), Group IV (Galangal) was applied topical AO 4 times, and Group V (Gel) was applied placebo topical material, used for the preparation of topical AO, 4 times. Wound healing findings were evaluated histopathologically. In the galangal group, it was found that collagen discoloration didn't penetrate into deep dermis compared to other groups; epidermis, hair follicles, and sebaceous glands remained protected compared to the burn control group, and there was a thicker layer of epidermis. It was found that the galangal group was the closest group to the control group histologically. In the galangal group, it was determined that the number of vessels and total hair follicles were significantly higher in the 8th h and 4th h respectively (p<0.05), while epidermal thickness and number of degenerated hair follicles were significantly higher in all hours compared to other three groups (p<0.05). It was determined that galangal group had the lowest scores in the evaluation of edema, polymorphonuclear leukocytes infiltration, collagen discoloration, injury of vessels, hair follicles and sebaceous glands in comparisons between groups and within groups' own processes. Administrating AO containing gel 4 times a day within the first 24 h is effective in the experimental contact type second degree burn model. It is significantly superior to SSD treatment, especially in the first 8 h of administration.

The effects of sildenafil and N-acetylcysteine the zone of stasis in burns.

In burn wound healing, zones of burn, namely zone of hyperemia, the zone of stasis, and zone of coagulation, have crucial importance. These zones have been identified based on the pathophysiology of the burn, and treatment of burn has been improved. The zone of necrosis is treated by excision and repair through grafting. Zone of stasis fully recovers in 24-48 h if the burn treatment is managed well. Otherwise, it may convert to a zone of coagulation. Hyperemia zone is a zone that recovers itself. Recovery of the zone of stasis is very critical in burn treatment. Active oxygen radicals produced due to the hypermetabolism due to burn wounds are known to speed to the process of the zone of stasis converting into the zone of coagulation. The present experimental study aims to evaluate the effects of sildenafil and N-acetylcysteine on the zone of stasis and to establish whether they had any contribution to wound healing in burns. In the present study, 32 four months old female Wistar Albino rats with 200±20 gr body weights were used. The rats were divided into four groups as the sham group (Group 1), the intraperitoneal group (Group 2), Sildenafil group (Group 3, intraperitoneal 10 mg/kg for 10 days), N-acetylcysteine (Group 4, intraperitoneal 100 mg/kg for 10 days). Tissue samples were collected for serum and cytopathology studies of the Malondialdehyde level, glutathione peroxidase, superoxide dismutase, and catalyze enzyme activity. All the rats were sacrificed on the 10th day of the tests edema, hyperemia, epithelial degeneration, necrosis, inflammatory infiltration and fibrosis measurements were made. When compared with the controls, both of the treatment groups had lower tissue damage scores. MDA level was lower in Group 3 and 4 compared to Group 2 and lower in Group 3 compared to Group 4. SOD, catalase and GPH-Px levels were higher in Group 3 and Group 4 compared to Group 2 and higher in Group 3 compared to Group 4. The results of our study conducted on an experimental burn model created by rats support that Sildenafil and N-acetylcysteine have positive effects, such as decreasing oxidative stress level and increasing wound healing in burns. Further experimental studies are required on this subject.

Deneysel Yanık Modelinde Hiperbarik Oksijen ve Medikal Ozon Tedavisinin Yara İyileşmesi Üzerine Etkilerinin Karşılaştırılması

Objective: Burn injury is a type of injury which is the disruptin of skin and organs by the effects of heat, electrical current, chemical caustic or burning agents. The purposes of daily burn care are removing of necrotic tissue, prevention of bacterial contamination, control of travma, stimulation of epithelization and protection of systemic complications. In this study, the effects of hyperbaric oxygen and ozone therapy were investigated, and used as adjuvant therapy in burn management, on burned areas utilizing experimental burn model. Material and Methods: In this study, 28 Wistar albino rats weighing 200-220 gr were used and divided into four groups. 10% burn defect areas were occured in all experiments. In the first group, rats were treated with hyperbaric oxygen. Medical ozone therapy was applied to the second group. In the third group, only debridement was used as treatment. Any treatment options were not used to rats in the fourth group. Results: The analysis revealed no statistically significant difference of burns surface areas between Groups 1 and 2, while a significant reduction were noted in Groups 1 and 2 when compared to the other groups. On histopathologic examination of the Groups 1 and 2 we observed a significant decrease in the inflammation and fibrosis rates when compared with other groups. Conclusion: As a result, we observed the affirmative effects of hyperbaric oxygen and ozone therapy on burn management. We suggest that these treatment modalities can be added to standart treatment options as adjuvant therapy. We also think that large researches are needed to support this issue.

Recovery of Burn Stasis Zone Using Pentoxifylline and Milrinone in an Experimental Burn Model Established For Rats

Recovery of Burn Stasis Zone Using Pentoxifylline and Milrinone in an Experimental Burn Model Established For Rats