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Pressão subaracnóide, índice pressão volume e parâmetros cardiorrespiratórios em ovinos submetidos a mielografia lombar

Authors: Souza, João Augusto Leonel de;

Pressão subaracnóide, índice pressão volume e parâmetros cardiorrespiratórios em ovinos submetidos a mielografia lombar

Abstract

The myelography is very accomplished in veterinary practice, however there are significant adverse effects associated with it. The aim of this research was to evaluate the possible effects of subarachnoid pressure, cardiorespiratory parameters (TC, FR, FC, PAS, PAD, PAM, EtCO2, SpO2, InspISO and FeISO) and pressure-volume index (PVI) in sheep otherwise healthy undergoing lumbar myelography. 8 healthy female sheep were used, which were pre-medicated with midazolam (0.5 mg / kg) anesthetic induction with propofol (3-6 mg / kg) and anesthesia maintained with isoflurane. First, the animals were submitted to the puncture of the cisterna magna and pressure monitoring. Subsequently, the lumbar myelography was performed by application of iohexol (300 mg / ml at rate 4.1 ml / min and a dose of 0.4 ml / kg). The time points studied were: immediately after anesthetic stabilization (M0) during a lumbar puncture (M1), two, four and six minutes after application of contrast (M2, M3 and M4, respectively). Subarachnoid pressure (Sap) was taken immediately after the atlanto-occipital punch (Sap0), the largest value during application of the contrast medium (Sapmax), two, four and six minutes after application of the contrast medium (SAP2, Sap3 and Sap4, respectively). They found significant differences at 5% confidence between times the variables TC, PAS, PAD, PAM, InspISO, FeISO Sap and PPC by Tukey test. With the Pearson correlation TC/FR, FC/SpO2, FC/FR, FR/PAS, FR/PAD, FR/PAM, FR/PPC, Sap/PAS, PAD/Sap, PAM/Sap, EtCO2/SPO2, EtCO2/InsplSO, PAD/PAS, PAS/PAM, PAM/PAD, FelSO/InsplSO and Sap/PPC Based on the results we conclude that the PVI values for the sheep, the methodology employed was 17.91 mL, close to normal values for adults of the human species. While performing the lumbar myelography is significant increase in Sap (average of 101.87 mmHg), causing severe reduction in PPC.

A mielografia é muito realizada na prática veterinária, entretanto, existem importantes efeitos adversos associados a ela. O objetivo da presente pesquisa foi avaliar os possíveis efeitos sobre a pressão subaracnoide, parâmetros cardiorrespiratórios (TC, FR, FC, PAS, PAD, PAM, EtCO2, SpO2, InspISO e FeISO) e do índice de pressão-volume (PVI) em ovelhas hígidas submetidas à mielografia lombar. Foram utilizados 8 ovinos fêmeas sadios, os quais foram pré-medicados com Midazolan (0,5 mg/Kg), indução anestésica com Propofol (3-6 mg/Kg) e manutenção anestésica com Isoflurano. Primeiramente, os animais foram submetidos à punção da cisterna magna para monitoramento da pressão subaracnoide (Sap). Ato contínuo, foi realizado a mielografia lombar por meio da aplicação de Iohexol (300 mg/mL, taxa de 4,1 mL/min e dose de 0,4 mL/Kg). Os momentos estudados foram: imediatamente após a estabilização anestésica (M0), durante a punção lombar (M1), dois, quatro e seis minutos após a aplicação do contraste (M2, M3 e M4, respectivamente). A Sap foi colhida imediatamente após à punção atlanto-occipital (Sap0), o maior valor durante a aplicação do meio de contraste (Sapmax), dois, quatro e seis minutos após a aplicação do meio de contraste (Sap2, Sap3 e Sap4, respectivamente). Constataram-se diferenças significativas a 5% de confiança entre os momentos as variáveis: TC, PAS, PAD, PAM, InspISO, FeISO Sap e PPC pelo teste de Tukey. Com a correlação de Pearson TC/FR, FC/SpO2, FC/FR, FR/PAS, FR/PAD, FR/PAM, FR/PPC, Sap/PAS, PAD/Sap, PAM/Sap, EtCO2/SPO2, EtCO2/InsplSO, PAD/PAS, PAS/PAM, PAM/PAD, FelSO/InsplSO e Sap/PPC. Com base nos resultados concluímos que os valores de PVI, para a espécie ovina, com a metodologia empregada foi de 17,91 mL. Durante a realização da mielografia lombar ocorre aumento significativo da Sap (média de 101,87 mmHg), provocando grave redução da PPC.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Pós-graduação em Cirurgia Veterinária - FCAV

Country
Brazil
Keywords

Neurorradiologia, Sheep, Neuroradiology, Intracranial pressure, Pressão intracraniana, PVI, Ovelhas

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green