Preliminary evaluation of the effects of a 1:1 inspiratory-to-expiratory ratio in anesthetized and ventilated horses

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dc.catalogadorgjm
dc.contributor.authorPittman, Ella
dc.contributor.authorMartin-Flores, Manuel
dc.contributor.authorMosing, Martina
dc.contributor.authorLorenzutti, Matías
dc.contributor.authorRetamal Montes, Jaime
dc.contributor.authorStaffieri, Francesco
dc.contributor.authorAdler, Andy
dc.contributor.authorCampbell, Mark
dc.contributor.authorAraos, Joaquín
dc.date.accessioned2023-12-29T13:46:13Z
dc.date.available2023-12-29T13:46:13Z
dc.date.issued2022
dc.description.abstractObjective: To describe some cardiorespiratory effects of an inspiratory-to-expiratory (IE) ratio of 1:1 compared with 1:3 in ventilated horses in dorsal recumbency. Study design: Randomized crossover experimental study. Animals: A total of eight anesthetized horses, with 444 (330–485) kg body weight [median (range)]. Methods: Horses were ventilated in dorsal recumbency with a tidal volume of 15 mL kg–1 and a respiratory rate of 8 breaths minute–1, and IE ratios of 1:1 (IE1:1) and 1:3 (IE1:3) in random order, each for 25 minutes after applying a recruitment maneuver. Spirometry, arterial blood gases and dobutamine requirements were recorded in all horses during each treatment. Electrical impedance tomography (EIT) data were recorded in four horses and used to generate functional EIT variables including regional ventilation delay index (RVD), a measure of speed of lung inflation, and end-expiratory lung impedance (EELI), an indicator of functional residual capacity (FRC). Results were assessed with linear and generalized linear mixed models. Results: Compared with treatment IE1:3, horses ventilated with treatment IE1:1 had higher mean airway pressures and respiratory system compliance (p < 0.014), while peak, end-inspiratory and driving airway pressures were lower (p < 0.001). No differences in arterial oxygenation or dobutamine requirements were observed. PaCO2 was lower in treatment IE1:1 (p = 0.039). Treatment IE1:1 resulted in lower RVD (p < 0.002) and higher EELI (p = 0.023) than treatment IE1:3. Conclusions and clinical relevance: These results suggest that IE1:1 improved respiratory system mechanics and alveolar ventilation compared with IE1:3, whereas oxygenation and dobutamine requirements were unchanged, although differences were small. In the four horses where EIT was evaluated, IE1:1 led to a faster inflation rate of the lung, possibly the result of increased FRC. The clinical relevance of these findings needs to be further investigated.
dc.description.funderCornell University Hospital for Animals
dc.description.funderFrederik Rousseau-Blass
dc.description.funderUniversité de Montréal
dc.fechaingreso.objetodigital2023-12-29
dc.fuente.origenSCOPUS
dc.identifier.doi10.1016/j.vaa.2022.07.009
dc.identifier.eissn1467-7295
dc.identifier.pubmedid36064498
dc.identifier.scopusidSCOPUS_ID:85138536600
dc.identifier.urihttp://www.elsevier.com/locate/issn/14672987
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/75582
dc.information.autorucEscuela de Medicina; Retamal Montes, Jaime; 0000-0002-6817-3659; 175147
dc.issue.numero6
dc.language.isoen
dc.nota.accesoContenido parcial
dc.pagina.final649
dc.pagina.inicio645
dc.revistaVeterinary Anaesthesia and Analgesia
dc.rightsacceso restringido
dc.subjectElectrical impedance tomography in horses
dc.subjectEquine mechanical ventilation
dc.subjectEquine respiratory mechanics
dc.subjectInspiratory-to-expiratory ratios
dc.titlePreliminary evaluation of the effects of a 1:1 inspiratory-to-expiratory ratio in anesthetized and ventilated horses
dc.typeartículo
dc.volumen49
sipa.codpersvinculados175147
sipa.trazabilidadSCOPUS;10-11-2022
sipa.trazabilidadORCID;2023-12-25
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