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Respiratory mechanics and morphometric changes during anesthesia with ketamine in normal rats
O Alves-Neto1, P Tavares, P R Rocco
1Laboratório de Fisiologia Respiratória, Departamento de Clínica Médica, Faculdade de Ciências da Saúde, Universidade de Brasília, Brasília, DF, Brasil. onofre@zaz.com.br
Summary
Ketamine increased lung mechanical inhomogeneities in rats, possibly due to alveolar duct dilation and collapse. This suggests ketamine affects the lung periphery rather than airways.
Area of Science:
- Respiratory physiology
- Anesthesiology
- Pulmonary mechanics
Background:
- Ketamine is thought to decrease airway and pulmonary resistance.
- Understanding ketamine's precise effects on respiratory mechanics is crucial.
Purpose of the Study:
- To investigate ketamine's impact on respiratory system, lung, and chest wall mechanical properties.
- To correlate mechanical findings with lung histology in normal animals.
Main Methods:
- Wistar rats were divided into control and ketamine groups.
- Animals were sedated, anesthetized, paralyzed, and mechanically ventilated.
- Respiratory system mechanics and lung histology were analyzed.
Main Results:
- Ketamine significantly increased lung viscoelastic/inhomogeneous pressure by 26%.
- Histology revealed alveolar duct dilation and increased alveolar collapse in the ketamine group.
- Dynamic and static elastances showed a greater difference in the ketamine group.
Conclusions:
- Ketamine's primary effect is on the lung periphery, not airways.
- Increased mechanical inhomogeneities may result from distal airway dilation and alveolar collapse.
- Ketamine alters lung mechanics at the alveolar level.