Investigation Into the Use of the Laryngeal Mask Airway in Pentobarbital Anesthetized Dogs

Bráz, José Reinaldo Cerqueira; Martins, Regina Helena Garcia; Mori, A. Rodríguez; Luna, Stélio Pacca Loureiro

doi:10.1111/j.1532-950x.1999.00502.x

Cited by 21 publications

(11 citation statements)

References 11 publications

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“…We had already shown in a previous study the efficacy of LM to maintain dog's airway patency during spontaneous ventilation 11 . In humans, LM 12,13 minimally changes cardiovascular dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…Por outro lado, pressões mais baixas podem não impedir escapes de ar ou aspiração do conteúdo gástrico, durante a ventilação mecânica 10 . Recentemente foi demonstrada a efetividade da ML em manter a patência das vias aéreas no cão 11 . Os objetivos do presente estudo foram verificar os efeitos da pressão de 60 cmH 2 O no balonete da ML sobre a mucosa faringolaríngea do cão, através de estudo de microscopia ópti-ca e eletrônica de varredura, além da avaliação das condições ventilatórias durante o experimento.…”

Section: * Recebido Do (Received From) Laboratório De Anestesiologia unclassified

“…Foram utilizados oito cães adultos, sendo cinco machos e três fêmeas, com peso variando de 14 a 20 quilogramas, constituindo um único grupo experimental (grupo G1). Um estudo prévio demonstrou que a ML de nú-mero 4 é a melhor opção para animais desse porte por acomodar-se efetivamente sobre a laringe e promover verdadeiro "selo", sem escape de ar durante a ventilação mecânica, com pressão inspiratória ao redor de 10 -15 cmH 2 O 11 . Instalou-se ventilação controlada em sistema circular semifechado, utilizando-se fluxo de gases frescos composto por mistura de ar comprimido (1 L.min -1 ) e O 2 (1 L.min -1 ), utilizando-se o aparelho de anestesia Exel 210 SE da Ohmeda (EUA).…”

Section: Métodounclassified

“…On the other hand, very low pressures may not prevent air leakages or gastric content aspiration during mechanical ventilation 10 . The effectiveness of the LM in maintaining airway patency in dogs has been recently shown 11 . This study aimed at observing the effects of 60 cmH 2 O cuff pressure on the laryngopharyngeal mucosa of dogs using light microscopy and scanning electronic microscopy, in addition to evaluating ventilatory conditions during the experiment.…”

Section: Introductionmentioning

confidence: 99%

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Efeitos de baixas pressões no balonete da máscara laríngea na mucosa faringolaríngea do cão

Martins¹,

Bráz²,

Moura³

et al. 2001

Rev. Bras. Anestesiol.

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Section: Discussionmentioning

confidence: 99%

Section: * Recebido Do (Received From) Laboratório De Anestesiologia unclassified

Section: Métodounclassified

Section: Introductionmentioning

confidence: 99%

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Efeitos de baixas pressões no balonete da máscara laríngea na mucosa faringolaríngea do cão

Martins¹,

Bráz²,

Moura³

et al. 2001

Rev. Bras. Anestesiol.

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“…A previous study showed that a number 4 LMA was the best option for dogs of this size to effectively cover the larynx and provide an effective seal. 10 Before anesthesia, an aneroid manometer (Tajiri Instrumental Co, Tokyo, Japan) was connected to a three-way stopcock to measure LMA intracuff pressure. Before each experiment, the device was calibrated against a mercury column.…”

Section: Discussionmentioning

confidence: 99%

Les pressions élevées du masque laryngé, causées par le protoxyde d’azote, n’augmentent pas les lésions muqueuses chez les chiens

Abud

Bráz

Martins

et al. 2001

Can J Anesth/J Can Anesth

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P Pu ur rp po os se e: : During general anesthesia, nitrous oxide (N 2 O) diffuses rapidly into the air-filled laryngeal mask airway (LMA) cuff, increasing intracuff pressure. There is no clear correlation between LMA intracuff pressure and pressure on the pharynx. We have studied the effects of high LMA intracuff pressures secondary to N 2 O on the pharyngeal mucosa of dogs.M Me et th ho od ds s: : Sixteen mongrel dogs were randomly allocated to two groups: G1 (intracuff volume, 30 mL; n=8) breathed a mixture of O 2 (l L·min 1 ) and air (l L·min 1 ) and G2 (intracuff volume, 30 mL; n=8) a mixture of O 2 (l L·min 1 ) and N 2 O (l L·min 1 ). Anesthesia was induced and maintained with pentobarbitone. LMA cuff pressure was measured at zero (control), 30, 60, 90 and 120 min after #4 LMA insertion. The dogs were sacrificed, and biopsy specimens from seven predetermined areas of the pharynx in contact with the LMA cuff were collected for light (LM) and scanning electron microscopic (SEM) examination by a blinded observer.R Re es su ul lt ts s: : LMA intracuff pressure decreased with time in G1 (P <0.001) and increased in G2 (P <0.001). There was a significant difference between the groups (P <0.001). In both groups, the LM study showed a normal epithelium covering the pharyngeal mucosa and mild congestion in the subepithelial layer. There were no differences between the groups (P >0.10) or among the areas sampled (P >0.05). In both groups, the SEM study showed a normal pharyngeal mucosa with mild superficial desquamation. Few specimens in G1 and G2 showed more intense epithelial desquamation.C Co on nc cl lu us si io on n: : High LMA intracuff pressures produced by N 2 O do not increase pharyngeal mucosal injury in dogs.Objectif : Pendant l anesthésie générale, le protoxyde d azote (N 2 O) diffuse rapidement dans le ballonnet gonflable du masque laryngé (ML), ce qui augmente la pression intraballonnet. Il n existe pas de corrélation évidente entre cette pression et la pression sur le pharynx. Nous avons étudié les effets de pressions élevées à l intérieur du ballonnet du ML, secondaires au N 2 O, sur la muqueuse pharyngée de chiens. Résultats : La pression intraballonnet du ML a diminué avec le temps dans le G1 (P < 0,001) et augmenté dans le G2 (P < 0,001). Il n y a pas eu de différence intergroupe significative ( P < 0,001). Dans les deux groupes, l examen MC a montré qu un épithélium normal recouvrait la muqueuse pharyngée et qu une congestion mineure existait dans la couche sous-épithéliale. Encore ici, il n y a pas eu de différence intergroupe (P > 0,10) ou de différence entre les zones échantillon-nées (P > 0,05). Dans les deux groupes, l examen MEB a montré une muqueuse pharyngée normale et une desquamation superficielle légère. Peu de spécimens du G1 et du G2 ont affiché une desquamation épithéliale plus importante.

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Airway Management

Rozanski

2018

Textbook of Small Animal Emergency Medicine

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Investigation Into the Use of the Laryngeal Mask Airway in Pentobarbital Anesthetized Dogs

Abstract: This device may allow safe maintenance of an airway in dogs when intubation is difficult or when it interferes with the procedure (eg, cervical myelography).

Cited by 21 publications

References 11 publications

Efeitos de baixas pressões no balonete da máscara laríngea na mucosa faringolaríngea do cão

Efeitos de baixas pressões no balonete da máscara laríngea na mucosa faringolaríngea do cão

Les pressions élevées du masque laryngé, causées par le protoxyde d’azote, n’augmentent pas les lésions muqueuses chez les chiens

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