scholarly journals Experimental Methods to Simulate and Evaluate Postsurgical Peripheral Nerve Scarring

2021 ◽  
Vol 10 (8) ◽  
pp. 1613
Author(s):  
Alessandro Crosio ◽  
Giulia Ronchi ◽  
Benedetta Elena Fornasari ◽  
Simonetta Odella ◽  
Stefania Raimondo ◽  
...  
Keyword(s):  
Peripheral Nerve ◽  
Peripheral Nerves ◽  
Experimental Methods ◽  
Scar Tissue ◽  
Experimental Models ◽  
Tissue Formation ◽  
Surgical Interventions ◽  
Pubmed Database ◽  
Different Types ◽  
Scar Tissue Formation

As a consequence of trauma or surgical interventions on peripheral nerves, scar tissue can form, interfering with the capacity of the nerve to regenerate properly. Scar tissue may also lead to traction neuropathies, with functional dysfunction and pain for the patient. The search for effective antiadhesion products to prevent scar tissue formation has, therefore, become an important clinical challenge. In this review, we perform extensive research on the PubMed database, retrieving experimental papers on the prevention of peripheral nerve scarring. Different parameters have been considered and discussed, including the animal and nerve models used and the experimental methods employed to simulate and evaluate scar formation. An overview of the different types of antiadhesion devices and strategies investigated in experimental models is also provided. To successfully evaluate the efficacy of new antiscarring agents, it is necessary to have reliable animal models mimicking the complications of peripheral nerve scarring and also standard and quantitative parameters to evaluate perineural scars. So far, there are no standardized methods used in experimental research, and it is, therefore, difficult to compare the results of the different antiadhesion devices.

scholarly journals THE EFFECT OF SECONDARY INFECTIONS ON EXPERIMENTAL TRACHOMA

1931 ◽  
Vol 53 (5) ◽  
pp. 753-762 ◽  
Author(s):  
P. K. Olitsky ◽  
R. E. Knutti ◽  
J. R. Tyler
Keyword(s):  
Blood Vessels ◽  
Scar Tissue ◽  
Tissue Formation ◽  
Experimental Animals ◽  
Secondary Infections ◽  
Different Types ◽  
Lymphoid Infiltration ◽  
Papillary Hyperplasia ◽  
Suitable Technique ◽  
Scar Tissue Formation

The possibility suggested itself, in view of the theories already advanced with regard to the rô1e of secondary infections in the later manifestations of trachoma (1), that the implantation of common bacteria on the conjunctivae of monkeys already having well marked characteristic granulosis lesions might give rise to a condition showing less predominance of the follicular reaction and more of the hyperemic granulopapillary effect. We believe we have succeeded, by a suitable technique, in doing this and in producing thereby in the experimental animals a condition closely resembling the florid type of human trachoma (Type IIb and c of MacCallan). The organisms used were some of those which are found in the conjunctival sac of monkey and man with different types of granular conjunctivitis. Of themselves, they produced only a transient reaction or none, as Noguchi had already shown and as we ourselves had observed in control animals. When inoculated together with material containing Bacterium granulosis, they did not affect the usual action of this organism, but when introduced into a conjunctiva in which granulosis lesions were already well developed, they induced more of the characteristics of the florid stage of trachoma than have been hitherto observed in animals, notably increased hyperemia, edema and thickening, papillary hypertrophy, obscurity of blood vessels, and masking of the follicles. Microscopically these changes were accompanied by increased scar tissue formation, lymphoid infiltration, and papillary hyperplasia.

scholarly journals VEGF Receptor-2 Activation Mediated by VEGF-E Limits Scar Tissue Formation Following Cutaneous Injury

2018 ◽  
Vol 7 (8) ◽  
pp. 283-297 ◽  
Author(s):  
Lyn M. Wise ◽  
Gabriella S. Stuart ◽  
Nicola C. Real ◽  
Stephen B. Fleming ◽  
Andrew A. Mercer
Keyword(s):  
Scar Tissue ◽  
Vegf Receptor ◽  
Tissue Formation ◽  
Cutaneous Injury ◽  
Scar Tissue Formation

The effects of mitomycin C and 5-fluorouracil/triamcinolone on fibrosis/scar tissue formation secondary to subglottic trauma (experimental study)

2005 ◽  
Vol 26 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Hakan Cincik ◽  
Atila Gungor ◽  
Adem Cakmak ◽  
Atilla Omeroglu ◽  
Ethem Poyrazoglu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Mitomycin C ◽  
Scar Tissue ◽  
Tissue Formation ◽  
Scar Tissue Formation

Waterjet Dissection of Peripheral Nerves: An Experimental Study of the Sciatic Nerve of Rats

2010 ◽  
Vol 67 (suppl_2) ◽  
pp. ons368-ons376 ◽  
Author(s):  
Christoph A. Tschan ◽  
Doerthe Keiner ◽  
Harald D. Müller ◽  
Kerstin Schwabe ◽  
Michael R. Gaab ◽  
...  
Keyword(s):  
Sciatic Nerve ◽  
Peripheral Nerve ◽  
Nerve Regeneration ◽  
Peripheral Nerves ◽  
Scar Tissue ◽  
Small Water ◽  
Peripheral Nerve Surgery ◽  
Sciatic Nerves ◽  
Nerve Surgery ◽  
Waterjet Dissection

ABSTRACT BACKGROUND: Although waterjet dissection has been well evaluated in intracranial pathologies, little is known of its qualities in peripheral nerve surgery. Theoretically, the precise dissection qualities could support the separation of nerves from adjacent tissues and improve the preservation of nerve integrity in peripheral nerve surgery. OBJECTIVE: To evaluate the potential of the new waterjet dissector in peripheral nerve surgery. METHODS: Waterjet dissection with pressures of 20 to 80 bar was applied on the sciatic nerves of 101 rats. The effect of waterjet dissection on the sciatic nerve was evaluated by clinical tests, neurophysiological examinations, and histopathological studies up to 12 weeks after surgery. RESULTS: With waterjet pressures up to 30 bar, the sciatic nerve was preserved in its integrity in all cases. Functional damaging was observed at pressures of 40 bar and higher. However, all but 1 rat in the 80 bar subgroup showed complete functional regeneration at 12 weeks after surgery. Histopathologically, small water bubbles were observed around the nerves. At 40 bar and higher, the sciatic nerves showed signs of direct nerve injury. However, all these animals showed nerve regeneration after 12 weeks, as demonstrated by histological studies. CONCLUSION: Sciatic nerves were preserved functionally and morphologically at pressures up to 30 bar. Between 40 and 80 bar, reliable functional and morphological nerve regeneration occurred. Waterjet pressures up to 30 bar might be applied safely under clinical conditions. This technique might be well suited to separate intact peripheral nerves from adjacent tumor or scar tissue. Further studies will have to show the clinical relevance of these dissection qualities.

Identifying wound infections for veterinary nurses

2020 ◽  
Vol 11 (10) ◽  
pp. 447-451
Author(s):  
Amanda Curtis
Keyword(s):  
Healing Process ◽  
Scar Tissue ◽  
Care Practice ◽  
Wound Infections ◽  
Tissue Formation ◽  
Deep Tissue ◽  
The Difference ◽  
Bite Wounds ◽  
Major Factors ◽  
Scar Tissue Formation

Heavily contaminated wounds are a common occurrence in both referral and primary care practice, with traumatic and bite wounds being among the most typical aetiologies seen. Each type of wound can be affected by numerous factors that can inhibit the healing process, one of these major factors is infection. Wound infections and the formation of biofilms can present veterinary nurses with a variety of challenges, which is why it is important that we understand the difference between normal inflammatory signs and the signs of infection. The early identification of infection and biofilms within a wound can influence healing times, scar tissue formation and length of healing. This article aims to highlight the difference between inflammation and infection, the different levels of contamination within a wound, and ways to decipher between superficial and deep tissue infections.

NEW TECHNOLOGICAL APPROACH TO STUDY ROTATOR CUFF PATHOLOGY

2012 ◽  
Vol 15 (01) ◽  
pp. 1250010 ◽  
Author(s):  
Christopher Vercollone ◽  
Christopher Rashidifard ◽  
Shiyi Zan ◽  
Scott D. Martin ◽  
Mark E. Brezinski
Keyword(s):  
Rotator Cuff ◽  
Imaging Modality ◽  
Supraspinatus Tendon ◽  
Scar Tissue ◽  
Tissue Formation ◽  
Structural Abnormalities ◽  
Male Wistar Rats ◽  
Picrosirius Red ◽  
Cuff Repair ◽  
Scar Tissue Formation

Rotator cuff repair (RCR) is a crucial surgical procedure, but has unacceptable mechanical failure rates between 25–60%. Examining supplemental synergistic interventions, such as biological augmentations (ex: growth factors) to improve fibrocartilage formation rather than scar tissue formation, would make tears more amenable to surgical repair. Due to the large number of agents and application methods (and times), improved techniques are needed for assessing RCR in animals. In particular, high-resolution real-time imaging is needed to guide tissue engineering in animal models. Optical coherence tomography (OCT) is well suited for this role, with resolutions 25 × greater than any clinical imaging modality and an ability to identify organized collagen with polarization sensitive techniques. For example, it can determine severe collagen depletion in visually normal tendons. The images here show the first OCT and PS-OCT of the rotator cuff in male Wistar rats. The structure of the supraspinatus tendon, enthesis, and humerus are well defined. For histological comparison, this sample was stained with both Masson's Trichrome, to expose any structural abnormalities, and Picrosirius Red, to determine collagen content using a polarization filter. OCT studies offer the potential of understanding RCR failure mechanisms and potential tissue altering agents, substantially impacting outcomes.

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