Research progress on animal models of combined radiation-wound injury / 中国辐射卫生

A combined radiation-wound injury refers to a radiation injury combined with a traumatic wound, with the characteristics of repeated ulceration and a long and difficult healing process, which is a focus in the field of research on difficult-to-heal wounds. To research combined radiation-wound injuries, the establishment of animal models is a key part, and appropriate animal models are a guarantee of reliable experimental results. This review summarizes the current research progress on various animal models of combined radiation-wound injuries in terms of radiation types, animal species, and injury types and location, aiming to provide a scientific basis for establishing standardized animal models, studying injury mechanisms, and evaluating prevention and treatment efficacy for combined radiation-wound injuries.

3D-printed multifunctional wound dressing for combined radiation and wound injury / 中国组织工程研究

BACKGROUND:Combined radiation and wound injury appeared mainly in patients with tumor radiotherapy and nuclear radiation accidents.The radiation destroys the repair mechanism,resulting in delayed or prolonged wound healing.It still lacks an effective therapeutic strategy currently. OBJECTIVE:To prepare multifunctional wound dressings based on the multiple clinical symptoms of combined radiation and wound injury,which are designed to be antibacteria,promoted healing and analgesics. METHODS:Using levofloxacin,fibroin and lidocaine hydrochloride as raw materials,3D bioprinting technology was applied to prepare the multifunctional wound dressing.(1)The multifunctional dressing was placed on a fixed culture plate coated with Staphylococcus aureus,Escherichia coli and Pseudomonas aeruginosa,and incubated at 37 ℃ overnight to detect the diameter of the antibacterial zone.(2)40 Kunming mice were randomly divided into trauma group,radiation and trauma model group,treatment group and positive drug group,with 10 mice in each group.Mice in the radiation and trauma model group,treatment group and positive drug group were irradiated by 60Co gamma rays.After 1 hour of radiation,a full-layer skin defect wound with a diameter of 1 cm was made on the back of each mouse in the four groups.Normal saline was applied to the wounds of the trauma group and the radiation and trauma model group.Trethanolamine cream was applied to the wounds of the positive drug group.Multifunctional dressing was applied to the wounds of the treatment group.The dressing was changed every 2 days,and the treatment was continued for 14 days.Wound healing rate and serum interleukin-6 level were measured at 3,7 and 14 days after wound modeling.14 days after the wound modeling,the skin tissue of the wound was obtained and received hematoxylin-eosin staining,Masson staining and cytokeratin-14 immunohistochemical staining. RESULTS AND CONCLUSION:(1)3D-printed multifunctional wound dressing had good antibacterial activity.The antibacterial zone diameters against Staphylococcus aureus,Escherichia coli and Pseudomonas aeruginosa were(4.15±0.09),(4.18±0.23)and(4.35±0.13)cm,respectively.(2)With the extension of modeling time,the wound healed gradually.The wound healing rate of the treatment group and the positive drug group was higher than that of the radiation and trauma model group at 3,7 and 14 days after modeling(P<0.01,P<0.001).The wound healing rate of the treatment group was higher than that of the positive drug group.With the extension of modeling time,the serum interleukin level of mice increased first and then decreased.The serum interleukin level in the treatment group at 3,7 and 14 days after modeling was lower than that in the radiation and trauma model group.Hematoxylin-eosin staining and Masson staining exhibited that inflammatory cells infiltrated the granuloma tissue in the trauma group,and the dermal collagen fibers were densely arranged.The normal structure of epidermis and dermis was destroyed and inflammatory cells were infiltrated in the radiation and trauma model group.In the treatment group,normal skin mucosal tissue was observed,the epidermis was arranged closely,and the sweat glands,hair follicles and dermal collagen fibers were arranged regularly.In the positive drug group,the arrangement of epidermal layer was tight,and the arrangement of sweat glands,hair follicles and dermal collagen fibers was regular.Cytokeratin-14 immunohistochemical staining displayed that the epidermal tissue thickness in the treatment group was lower than that in the other three groups(P<0.01,P<0.001).(3)The results confirm that the 3D-printed multifunctional dressing has multiple functions of local anesthesia,anti-infection and promoting healing.

Curativos tópicos para áreas doadoras de enxertos de pele parcial: é possível estabelecer o mais adequado com base em uma revisão da literatura? / Split-thickness skin graft donor-site dressings: is it possible to establish the ideal dressing based on a literature review?

O objetivo deste estudo foi verificar, por meio de uma revisão da literatura, a possibilidade de se estabelecer, com base em evidências científicas, o curativo tópico mais adequado para a aplicação em áreas doadoras em enxertos de pele parcial. Foram analisados os mais relevantes estudos publicados originalmente nos últimos sete anos, em qualquer idioma, porém, que estivessem indexados às bases de dados US National Library of Medicine (PubMed), Cochrane Central Register of Controlled Trials (CENTRAL) e Literatura Latino-Americana e do Caribe em Ciências da Saúde (LILACS). As buscas foram realizadas por meio do uso de descritores associados ao tema e de critérios de inclusão e exclusão. A amostra final deste estudo foi composta por 25 publicações, sendo uma nacional e 24 internacionais. Com base nos achados, constatou-se que há uma lacuna na literatura acerca de estudos que visam analisar os diferentes tipos de curativos usados em áreas doadoras em enxertos de pele parcial. Por meio da revisão da literatura realizada, pode-se concluir que não é possível se estabelecer o curativo mais adequado para uso em áreas doadoras de enxertos de pele parcial, devido à falta de evidências científicas que possibilitem um achado conclusivo acerca do tema.

This study aimed to assess the possibility of establishing the most suitable split-thickness skin graft donor site dressings on the basis of scientific evidence gathered through a literature review. The most relevant studies originally published in any language in the last 7 years and indexed in the US National Library of Medicine (PubMed), Cochrane Central Register of Controlled Trials (CENTRAL), and Latin American and Caribbean Literature Health Sciences (LILACS) databases were evaluated. A literature survey was performed using keywords related to the theme and inclusion and exclusion criteria. The final sample comprised 25 publications, one domestic and 24 international. The results showed a gap in the literature with respect to studies that evaluated different split-thickness skin graft donor site dressings. The literature review revealed the impossibility of establishing the most effective split-thickness skin graft donor site dressing due to the lack of scientific evidence, thus preventing the formulation of a definite conclusion on this topic.

Lesiones medulares por arma blanca. Presentación de casos clínicos y propuesta de manejo / Spinal cord injuries. Presentation of clinical cases and management proposal

Resumen: Las lesiones raquimedulares producidas por arma blanca son poco frecuentes, pero constituyen hasta un 10% de las lesiones penetrantes espinales. Se presentan tres casos de lesiones raquimedulares causadas por arma blanca, se trata de dos mujeres y un hombre que recibieron agresiones con cuchillos a nivel del dorso. Una lesión fue a nivel torácico y dos a nivel cervical. Se trataba de lesiones medulares incompletas y recibieron un manejo conservador. La evolución fue buena en dos pacientes y mala en uno, que requirió en diferido asistencia respiratoria mecánica y agravó su déficit motor (cuadriparesia a prácticamente una cuadriplejia). En base a estos casos, los autores hacen una revisión del tema y plantean un esquema de manejo diagnóstico y terapéutico para las lesiones raquimedulares penetrantes no causadas por arma de fuego.

Abstract Spinal cord injuries are rare, but constitute up to 10% of spinal penetrating lesions. There are three cases of spinal cord injury, two women and one man who were attacked by knives at the level of the back. One injury was at the thoracic level and two at the cervical level. They were incomplete medullary lesions and received conservative management. The evolution was good in two patients and poor in one, which required a delayed mechanical ventilation and aggravated its motor deficit (quadriparesis to practically a quadriplegia). Based on these cases, the authors make a review of the subject and propose a diagnostic and therapeutic management scheme for penetrating spinal cord injuries not caused by firearms.

Anti-apoptosis and anti-inflammatory effect of osthole in mice following stab wound injury / 中国药理学通报

Aim To investigate the effects of osthol on cell apoptosis and inflammatory cell infiltration after brain stab wound injury in mice. Methods The mice underwent the stab wound injury by a needle, then were randomly divided into sham operation group, model group, osthol 10, 20, 30 mg · kg-1 treatment group. The main examinations included mice brain wa-ter content; the apoptotic cytokines Bax, Bcl-2, Caspase-3 mRNA expression were assessed by PT-PCR; immunohistochemistry staining was used to de-tect neutrophils (MPO) and microglia (Iba-1) infiltra-tion and Caspase-3 positive cell expression around in-jured lesions. Results Treatment with osthole 20, 30 mg·kg-1 group significantly reduced the water content in injured brain, improved the ratio of Bax/Bcl-2, and reduced the expression of apoptosis cytokine Caspase-3 mRNA. Osthole 30 mg·kg-1 treatment group obvious-ly reduced the infiltration of neutrophils and microglial cells and significantly reduced the number of apoptotic cells around the injured cerebral cortex. Conclusion Osthole has therapeutic effect on stab wound injury in mice, and the possible mechanism may be by reducing the infiltration of inflammatory cells and reducing apop-totic cells.

Pitfalls and Red Flags in Common Clinical Syndromes

Awareness of pitfalls in common clinical symptoms is important. Not all patients with ACS presents with chest pains (beware of patients presenting with syncope, diaphoresis, dyspnoea, pain upper back, etc.). In a breathless patient, anxiety and other psychiatric conditions should only be considered as the diagnosis after careful exclusion of other life threatening causes: metabolic acidosis, partially occluded upper airway, bronchospasm, and pulmonary embolism. In a patient with headaches, intracranial haemorrhage, meningitis/ encephalitis, and brain mass lesion need to be considered in the differential diagnosis. The elderly patient presenting with acute abdominal pain will require FPs to maintain a high index of suspicion for potential life threatening causes. Possible causes of serious backache are ACS, AD, AAA, and spinal cord compression. In the wounded patient, there is a need to determine the medical condition that may have resulted in the patient’s injury, and patient’s risk profile is as important as the wound profile for correct management. In the pregnant patient, dyspnea can be due to pulmonary embolism, or heart failure; placenta abruption from abdominal injury may not have the classical triad of pain, tenderness or vaginal bleeding.

Pitfalls and Red Flags in Common Clinical Syndromes

Awareness of pitfalls in common clinical symptoms is important. Not all patients with ACS presents with chest pains (beware of patients presenting with syncope, diaphoresis, dyspnoea, pain upper back, etc.). In a breathless patient, anxiety and other psychiatric conditions should only be considered as the diagnosis after careful exclusion of other life threatening causes: metabolic acidosis, partially occluded upper airway, bronchospasm, and pulmonary embolism. In a patient with headaches, intracranial haemorrhage, meningitis/ encephalitis, and brain mass lesion need to be considered in the differential diagnosis. The elderly patient presenting with acute abdominal pain will require FPs to maintain a high index of suspicion for potential life threatening causes. Possible causes of serious backache are ACS, AD, AAA, and spinal cord compression. In the wounded patient, there is a need to determine the medical condition that may have resulted in the patient’s injury, and patient’s risk profile is as important as the wound profile for correct management. In the pregnant patient, dyspnea can be due to pulmonary embolism, or heart failure; placenta abruption from abdominal injury may not have the classical triad of pain, tenderness or vaginal bleeding.