A new anesthetic protocol to medullary nerve roots access in rats

ABSTRACT Purpose: To describe a new anesthetic protocol medullary and nerve roots access and in Rattus norvegicus. Methods: Seventy female Wistar rats (n=70) were used. The animals were randomly divided into two laminectomy groups: cervical (n=40) and thoracic (n=30). In cervical group, a right posterior hemilaminectomy was performed to access the nerve roots. In thoracic group, a laminectomy of the eighth thoracic vertebra was accomplished. Thirty-five rats (20 cervical and 15 thoracic) were submitted to old anesthetic protocol (ketamine 70 mg/kg plus xylazine 10 mg/kg); and the 35 other animals (20 cervical and 15 thoracic) were submitted to a new anesthetic protocol (ketamine 60 mg/kg,xylazine 8 mg/kg and fentanyl 0.03 mg/kg). Results: The time to complete induction was 4.15 ±1.20 minin ketamine, xylazine and fentanyl group, and it was 4.09 ±1.47 min in the ketamine and xylazine group. There was no correlation in the time required to perform the cervical laminectomy in the old anesthetic protocol. In all groups, the animals submitted to the old anesthetic protocol had a higher level of pain on the first and third postoperative days than the animals submitted to the new anesthetic protocol. Conclusions: The new anesthetic protocol reduces the surgical time, allows better maintenance of the anesthetic plan, and brings more satisfactory postoperative recovery.

Efeitos da andiroba associada ao microagulhamento na pele de ratos / Effects of Carapa guyanensis associated to microneedling in mice skin

Introdução: O microagulhamento é uma técnica utilizada para o tratamento de cicatrizes e apresenta cada vez mais destaque na Dermatologia. Nesse contexto, em associação com o microagulhamento, drogas e ativos podem ser administrados por meio da técnica conhecida como drug delivery. Destaca-se o uso da vitamina C, por sua já comprovada ação antioxidante. Outro exemplo é a andiroba (Carapa guianensis Aubl.), por suas propriedades anti-inflamatória, analgésica, antisséptica e cicatrizante. Objetivo: Avaliar os efeitos da andiroba associada ao microagulhamento. Métodos: Foram utilizados 31 ratos machos distribuídos em cinco grupos: GPi (piloto), com três animais; GM (microagulhamento); GMA (microagulhamento + andiroba); GMV (microagulhamento + vitamina C); e GOM (microagulhamento + óleo mineral), com sete animais em cada grupo. Os animais foram submetidos à técnica do microagulhamento no D0 (dia 0) e à aplicação da substância do seu respectivo grupo, na pele, pela manhã, durante sete dias. Resultados: Houve diferença significativa entre a intensidade de proliferação fibroblástica e a vascularização observadas no tecido dos animais dos grupos GM e GMV. Já a intensidade de fibras colágenas foi superior nos animais do grupo GMV. Conclusões: O óleo de andiroba como drug delivery obteve resultados inferiores à vitamina C.

Introduction: Microneedling is a technique used to treat scars with increasing popularity in dermatology. In this context, associated to micro-needling, drugs and active substances can be administered through the technique known as drug delivery. We highlight the use of vitamin C, due to its known antioxidant properties. Another example is Carapa guianensis Aubl., due to its anti-inflammatory, analgesic, antiseptic and healing properties. Objective: To evaluate the effects of Carapa guyanensis associated to microneedling. Methods: Thirty-one male mice, distributed into five groups, were used: GPi (pilot), with three animals; GM (micro-needling); GMA (micro-needling + Carapa guyanensis); GMV (microneedling + vitamin C); and GOM (microneedling + mineral oil), with seven animals in each group. The animals were submitted to the microneedling technique on D0 (day 0) and to the application of the substance of its respective group in the skin, in the morning for seven days. Results: There was a significant difference between the expression of fibroblast proliferation and vascularization observed in the tissue of animals in groups GM and GMV. The expression of collagen fibers was superior in animals in the GMV group. Conclusions: Carapa guyanensis oil had inferior results as drug delivery when compared to vitamin C.