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| Author(s): |
Eveline Simões Azenha Aidar
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Jaboticabal. 2017-09-01. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal |
| Defense date: | 2017-07-20 |
| Advisor: | Newton Nunes; Ana Paula Gering |
| Abstract | |
Maintaining adequate respiratory function is essential for safe and efficient anesthesia. Therefore, studies evaluating ventilatory methods and their use in the clinical routine are necessary. In this study, spontaneous ventilation, pressurecontrolled ventilation, pressure-controlled ventilation associated with positive endexpiratory pressure, and synchronized intermittent mandatory ventilation were compared. The modalities were compared in four groups of eight rabbits each. The rabbits were anesthetized with isofluorane for two hours and placed in the right lateral recumbency, totaling 32 animals. Cardiovascular, ventilatory and hemogasometric variables were recorded at five different moments, with an interval of 30 minutes each. Afterwards, the results were statistically evaluated by the least squares method, followed by the Tukey - Kramer test (p≤0.05). Regarding the cardiovascular variables, mean values of mean arterial pressure (MAP) and systolic blood pressure (SBP) remained slightly below normal values in all groups. There was a significant decrease in MAP and PAS in the group under pressure controlled ventilation associated with positive end-expiratory pressure (GPP) throughout the anesthetic time. As for blood gases, the partial pressure of arterial carbon dioxide was higher in GPP when compared to other groups, generating respiratory acidosis after one hour of procedure. High partial pressure of venous oxygen means suggest a higher supply associated with lower O2 consumption in all groups. End-tidal carbon dioxide presented mildly elevated in pressure controlled ventilation group (GP) and spontaneous ventilation group (GE), whereas GPP presented higher averages that, possibly, are related to the decrease of the tidal volume in this group. Synchronized intermittent mandatory ventilation group (GM) was the only one to present normocapnia. The registered hemodynamic and ventilatory imbalances were aggravated or initiated after one hour of anesthetic procedure. It can be concluded that the use of synchronized intermittent mandatory ventilation provided better hemodynamic and ventilatory stability. (AU) | |
| FAPESP's process: | 15/26543-6 - Qualitative comparison among four different ventilatory modalities applied in prolonged anesthetic procedures in rabbits positioned in lateral recumbency |
| Grantee: | Eveline Simões Azenha Aidar |
| Support Opportunities: | Scholarships in Brazil - Master |