scholarly journals Differentiation of burn wounds in an in vivo porcine model using terahertz spectroscopy

2020 ◽  
Vol 11 (11) ◽  
pp. 6528
Author(s):  
Omar B. Osman ◽  
Timothy Jack Tan ◽  
Sam Henry ◽  
Adelaide Warsen ◽  
Navid Farr ◽  
...  
Keyword(s):  
Porcine Model ◽  
Terahertz Spectroscopy ◽  
Burn Wounds

scholarly journals Preclinical Testing of Radiopharmaceuticals for the Detection and Characterization of Osteomyelitis: Experiences from a Porcine Model

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4221
Author(s):  
Aage Kristian Olsen Alstrup ◽  
Svend Borup Jensen ◽  
Ole Lerberg Nielsen ◽  
Lars Jødal ◽  
Pia Afzelius
Keyword(s):  
Animal Model ◽  
Animal Models ◽  
Porcine Model ◽  
Animal Experiments ◽  
Radioactive Tracers ◽  
The Individual ◽  
Selection Of

The development of new and better radioactive tracers capable of detecting and characterizing osteomyelitis is an ongoing process, mainly because available tracers lack selectivity towards osteomyelitis. An integrated part of developing new tracers is the performance of in vivo tests using appropriate animal models. The available animal models for osteomyelitis are also far from ideal. Therefore, developing improved animal osteomyelitis models is as important as developing new radioactive tracers. We recently published a review on radioactive tracers. In this review, we only present and discuss osteomyelitis models. Three ethical aspects (3R) are essential when exposing experimental animals to infections. Thus, we should perform experiments in vitro rather than in vivo (Replacement), use as few animals as possible (Reduction), and impose as little pain on the animal as possible (Refinement). The gain for humans should by far exceed the disadvantages for the individual experimental animal. To this end, the translational value of animal experiments is crucial. We therefore need a robust and well-characterized animal model to evaluate new osteomyelitis tracers to be sure that unpredicted variation in the animal model does not lead to a misinterpretation of the tracer behavior. In this review, we focus on how the development of radioactive tracers relies heavily on the selection of a reliable animal model, and we base the discussions on our own experience with a porcine model.

scholarly journals Strong Antimicrobial and Healing Effects of Beta-Acids from Hops in Methicillin-Resistant Staphylococcus aureus-Infected External Wounds In Vivo

Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 708
Author(s):  
Radek Sleha ◽  
Vera Radochova ◽  
Jiri Malis ◽  
Alexander Mikyska ◽  
Milan Houska ◽  
...  
Keyword(s):  
Wound Healing ◽  
Porcine Model ◽  
Therapeutic Effects ◽  
Methicillin Resistant ◽  
Antimicrobial Effects ◽  
Therapeutic Modalities ◽  
Positive Effects ◽  
Inflammatory Parameters

Staphylococcus (S.) aureus is an important causative agent of wound infections with increasing incidence in the past decades. Specifically, the emergence of methicillin-resistant S. aureus (MRSA) causes serious problems, especially in nosocomial infections. Therefore, there is an urgent need to develop of alternative or supportive antimicrobial therapeutic modalities to meet these challenges. Purified compounds from hops have previously shown promising antimicrobial effects against MRSA isolates in vitro. In this study, purified beta-acids from hops were tested for their potential antimicrobial and healing properties using a porcine model of wounds infected by MRSA. The results show highly significant antimicrobial effects of the active substance in both the powder and Ambiderman-based application forms compared to both no-treatment control and treatment with Framycoin. Moreover, the macroscopic evaluation of the wounds during the treatment using the standardized Wound Healing Continuum indicated positive effects of the beta-acids on the overall wound healing. This is further supported by the microscopic data, which showed a clear improvement of the inflammatory parameters in the wounds treated by beta-acids. Thus, using the porcine model, we demonstrate significant therapeutic effects of hops compounds in the management of wounds infected by MRSA. Beta-acids from hops, therefore, represent a suitable candidate for the treatment of non-responsive nosocomial tissue infections by MRSA.

scholarly journals Development of a gel dedicated to gel immersion endoscopy

2021 ◽  
Vol 09 (06) ◽  
pp. E918-E924
Author(s):  
Tomonori Yano ◽  
Atsushi Ohata ◽  
Yuji Hiraki ◽  
Makoto Tanaka ◽  
Satoshi Shinozaki ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Porcine Model ◽  
Ex Vivo ◽  
In Vitro Experiments ◽  
Efficacy And Safety ◽  
Coagulative Necrosis ◽  
Novel Technique ◽  
In Vivo Experiments

Abstract Backgrounds and study aims Gel immersion endoscopy is a novel technique to secure the visual field during endoscopy. The aim of this study was to develop a dedicated gel for this technique. Methods To identify appropriate viscoelasticity and electrical conductivity, various gels were examined. Based on these results, the dedicated gel “OPF-203” was developed. Efficacy and safety of OPF-203 were evaluated in a porcine model. Results  In vitro experiments showed that a viscosity of 230 to 1900 mPa·s, loss tangent (tanδ) ≤ 0.6, and hardness of 240 to 540 N/cm2 were suitable. Ex vivo experiments showed electrical conductivity ≤ 220 μS/cm is appropriate. In vivo experiments using gastrointestinal bleeding showed that OPF-203 provided clear visualization compared to water. After electrocoagulation of gastric mucosa in OPF-203, severe coagulative necrosis was not observed in the muscularis but limited to the mucosa. Conclusions OPF-203 is useful for gel immersion endoscopy.

scholarly journals Dynamic Quantitative Iodine Myocardial Perfusion Imaging with Dual-Layer CT using a Porcine Model

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kai Scherer ◽  
Johannes Hammel ◽  
Thorsten Sellerer ◽  
Korbinian Mechlem ◽  
Bernhard Renger ◽  
...  
Keyword(s):  
Contrast Agent ◽  
Perfusion Imaging ◽  
Porcine Model ◽  
Ct Perfusion ◽  
Dual Energy Ct ◽  
Beam Hardening ◽  
Low Contrast ◽  
Time To Peak ◽  
Coronary Ct

Abstract Ischemic heart disease is the globally leading cause of death. When using coronary CT angiography, the functional hemodynamics within the myocardium remain uncertain. In this study myocardial CT perfusion imaging using iodine contrast agent demonstrated to strongly improve the assessment of myocardial disorders. However, a retrieval of such dynamics using Hounsfield units from conventional CT poses concerns with respect to beam-hardening effects and low contrast-to-noise ratio (CNR). Dual-energy CT offers novel approaches to overcome aforementioned limitations. Quantitative peak enhancement, perfusion, time to peak and iodine volume measurements inside the myocardium were determined resulting in 0.92 mg/ml, 0.085 mg/ml/s 17.12 s and 29.89 mg/ml*s, respectively. We report on the first extensive quantitative and iodine-based analysis of myocardial dynamics in a healthy porcine model using a dual-layer spectral CT. We further elucidate on the potential of reducing the radiation dose from 135 to 18 mGy and the contrast agent volume from 60 to 30 mL by presenting a two-shot acquisition approach and measuring iodine concentrations in the myocardium in-vivo down to 1 mg/ml, respectively. We believe that dynamic quantitative iodine perfusion imaging may be a highly sensitive tool for the precise functional assessment and monitoring of early myocardial ischemia.

scholarly journals Predictors of Thrombosis in Hepatic Vasculature during Microwave Tumor Ablation of an In Vivo Porcine Model

2014 ◽  
Vol 25 (12) ◽  
pp. 1965-1971.e2 ◽  
Author(s):  
Jason Chiang ◽  
Bridgett J. Willey ◽  
Alejandro Muñoz del Rio ◽  
J. Louis Hinshaw ◽  
Fred T. Lee ◽  
...  
Keyword(s):  
Porcine Model ◽  
Tumor Ablation ◽  
Hepatic Vasculature

scholarly journals Arginine Is a Critical Substrate for the Pathogenesis of Pseudomonas aeruginosa in Burn Wound Infections

mBio ◽  
2017 ◽  
Vol 8 (2) ◽  
Author(s):  
Jake Everett ◽  
Keith Turner ◽  
Qiuxian Cai ◽  
Vernita Gordon ◽  
Marvin Whiteley ◽  
...  
Keyword(s):  
Antimicrobial Agents ◽  
Hospital Setting ◽  
Multidrug Resistant ◽  
Burn Patients ◽  
Burn Wound ◽  
Burn Wounds ◽  
Resistant Strains ◽  
High Doses ◽  
Ubiquitous Presence

ABSTRACT Environmental conditions affect bacterial behavior and can greatly influence the course of an infection. However, the environmental cues that elicit bacterial responses in specific infection sites are relatively unknown. Pseudomonas aeruginosa is ubiquitous in nature and typically innocuous. However, it is also one of the most prevalent causes of fatal sepsis in burn wound patients. The aim of this study was to determine the impact of environmental factors, specifically the availability of arginine, on the pathogenesis of P. aeruginosa in burn wound infections. Comparison of burned versus noninjured tissue revealed that l-arginine (l-Arg) was significantly depleted in burn wounds as a consequence of elevated arginase produced by myeloid-derived suppressor cells. We also observed that l-Arg was a potent chemoattractant for P. aeruginosa, and while low concentrations of l-Arg increased P. aeruginosa’s swimming motility, high concentrations resulted in diminished swimming. Based on these observations, we tested whether the administration of exogenous l-Arg into the burn wound could attenuate the virulence of P. aeruginosa in thermally injured mice. Administration of l-Arg resulted in decreased P. aeruginosa spread and sepsis and increased animal survival. Taken together, these data demonstrate that the availability of environmental arginine greatly influences the virulence of P. aeruginosa in vivo and may represent a promising phenotype-modulating tool for future therapeutic avenues. IMPORTANCE Despite our growing understanding of the pathophysiology of burn wounds and the evolution of techniques and practices to manage infections, sepsis remains a significant medical concern for burn patients. P. aeruginosa continues to be a leader among all causes of bacteremic infections due to its tendency to cause complications in immunocompromised patients and its ubiquitous presence in the hospital setting. With the unforgiving emergence of multidrug-resistant strains, it is critical that alternative strategies to control or prevent septic infections in burn patients be developed in parallel with novel antimicrobial agents. In this study, we observed that administration of l-Arg significantly reduced bacterial spread and sepsis in burned mice infected with P. aeruginosa. Given the safety of l-Arg in high doses and its potential wound-healing benefits, this conditionally essential amino acid may represent a useful tool to modulate bacterial behavior in vivo and prevent sepsis in burn patients. IMPORTANCE Despite our growing understanding of the pathophysiology of burn wounds and the evolution of techniques and practices to manage infections, sepsis remains a significant medical concern for burn patients. P. aeruginosa continues to be a leader among all causes of bacteremic infections due to its tendency to cause complications in immunocompromised patients and its ubiquitous presence in the hospital setting. With the unforgiving emergence of multidrug-resistant strains, it is critical that alternative strategies to control or prevent septic infections in burn patients be developed in parallel with novel antimicrobial agents. In this study, we observed that administration of l-Arg significantly reduced bacterial spread and sepsis in burned mice infected with P. aeruginosa. Given the safety of l-Arg in high doses and its potential wound-healing benefits, this conditionally essential amino acid may represent a useful tool to modulate bacterial behavior in vivo and prevent sepsis in burn patients.

A novel anchoring system for colonic stents: a pilot in vivo study in a porcine model

2013 ◽  
Vol 18 (6) ◽  
pp. 551-556
Author(s):  
A. Nevler ◽  
U. Willantz ◽  
O. Doron ◽  
J. Sandbank ◽  
Y. Ziv
Keyword(s):  
Porcine Model ◽  
In Vivo Study ◽  
Anchoring System ◽  
Colonic Stents

Chronic in-vivo experience with an endoscopically delivered and retrieved duodenal-jejunal bypass sleeve in a porcine model

2007 ◽  
Vol 22 (4) ◽  
pp. 1023-1028 ◽  
Author(s):  
M. Tarnoff ◽  
S. Shikora ◽  
A. Lembo ◽  
K. Gersin
Keyword(s):  
Porcine Model ◽  
Jejunal Bypass

670 Delayed Enzymatic Debridement of Burn Wounds using the Proteolytic Gel SN514

2021 ◽  
Vol 42 (Supplement_1) ◽  
pp. S191-S192
Author(s):  
Angela R Jockheck-Clark ◽  
Randolph Stone ◽  
Michelle Holik ◽  
Lucy Schaffer ◽  
Shanmugasundaram Natesan ◽  
...  
Keyword(s):  
Burn Injury ◽  
Vehicle Control ◽  
Surrounding Tissue ◽  
Burn Wound ◽  
Burn Wounds ◽  
Delayed Treatment ◽  
Medical Evacuation ◽  
Contamination Levels

Abstract Introduction Thermal burns account for 5–10% of casualties sustained in present-day conflicts and are expected to be one of the most common wounds to occur in future conflicts. In prolonged field care (PFC) situations, medical evacuation could be delayed for days. During this time, burn wounds can become infected, detrimentally impact neighboring tissue, and cause systemic immune responses. Therefore, it is essential to test and evaluate non-surgical debridement agents that could be implemented prior to reaching a Role 3 military treatment facility. This work details how the proprietary proteolytic gel SN514 impacts burn debridement when applied within a PFC-like timeline. SN514 contains an enzyme formulation that is thermostable, easy to apply, and selectively degrades non-viable tissue in vitro and in vivo. Methods Deep-partial thickness contact burns were created using an established porcine model and covered with gauze or an antimicrobial incise drape. Four days later, the burns were treated with one of five treatments: 0.2% SN514, 0.8% SN514, a vehicle control, gauze, or an antimicrobial silver dressing. Treatments were re-applied every 24 hours for 72 to 96 hours. The effects of the treatment regiments were compared histologically. Biopsies were also taken to monitor bacterial contamination levels. Results Burns treated with SN514 were partially debrided and visually distinct from those treated with gauze, the silver dressing, or the vehicle control. Preliminary analyses suggest that SN514-treated burns that had been covered with “dry” gauze had a much lower debridement efficiency than those treated with the incise drape. This suggests that SN514 debridement efficiency may depend on the presence of a moist eschar. Preliminary analyses also suggest that there was little difference in burn wound bacterial counts among the five treatment groups. Conclusions SN514 is able to debride burns that experienced delayed treatment, without any evidence of harm to the surrounding tissue or evidence of exacerbating the original burn injury. SN514-treated wounds displayed little to no blood loss and did not increase burn wound infection levels compared to wounds treated with gauze or an antimicrobial silver dressing.

Sign in / Sign up

Export Citation Format

Share Document