TY - JOUR
T1 - Effects of halothane, enflurane, isoflurane, and sevoflurane on slowly adapting pulmonary stretch receptor activity in anesthetized dogs
AU - Mutoh, T.
AU - Tsubone, H.
AU - Nishimura, R.
AU - Sasaki, N.
PY - 1998/1/1
Y1 - 1998/1/1
N2 - The aim of this study was to evaluate the effects of halothane, enflurane, isoflurane, and sevoflurane on slowly adapting pulmonary stretch receptor (SAR) activity in dogs. Eight beagles were anesthetized with an intravenous injection of a mixture of urethane and α-chloralose as a basal anesthesia, then vagotomized, artificially ventilated, and chest opened. Single afferent activities from SARs were recorded from the peripheral nerve cut end of the left vagus. Changes in SAR activities with inhalation of halothane, enflurane, isoflurane, and sevoflurane at 1, 1.5, and 2 times the minimal alveolar anesthetic concentration (MAC) were measured, and differences in the discharges within and among four anesthetics were evaluated. As a result, two different types of SARs, low threshold SARs and high threshold SARs, were detected in this study. In all anesthetics, expiratory discharges of low threshold SARs decreased significantly in a dose-dependent manner, whereas inspiratory discharges did not change significantly at any anesthetic level. Discharges of high threshold SARs tended to decrease with increasing anesthetic level; however, no statistical significance was observed at any anesthetic level. Only one exception to these changes was observed at 1 MAC of halothane where no significant decrease in the expiratory discharge of low threshold SARs or significant increase in the discharge of high threshold SARs was induced against a control value. In conclusion, recent inhalation anesthetics, except for halothane at the light anesthetic level, tended to decrease SAR activities depending on the anesthetic level, suggesting attenuation of the Hering- Breuer inflation reflex.
AB - The aim of this study was to evaluate the effects of halothane, enflurane, isoflurane, and sevoflurane on slowly adapting pulmonary stretch receptor (SAR) activity in dogs. Eight beagles were anesthetized with an intravenous injection of a mixture of urethane and α-chloralose as a basal anesthesia, then vagotomized, artificially ventilated, and chest opened. Single afferent activities from SARs were recorded from the peripheral nerve cut end of the left vagus. Changes in SAR activities with inhalation of halothane, enflurane, isoflurane, and sevoflurane at 1, 1.5, and 2 times the minimal alveolar anesthetic concentration (MAC) were measured, and differences in the discharges within and among four anesthetics were evaluated. As a result, two different types of SARs, low threshold SARs and high threshold SARs, were detected in this study. In all anesthetics, expiratory discharges of low threshold SARs decreased significantly in a dose-dependent manner, whereas inspiratory discharges did not change significantly at any anesthetic level. Discharges of high threshold SARs tended to decrease with increasing anesthetic level; however, no statistical significance was observed at any anesthetic level. Only one exception to these changes was observed at 1 MAC of halothane where no significant decrease in the expiratory discharge of low threshold SARs or significant increase in the discharge of high threshold SARs was induced against a control value. In conclusion, recent inhalation anesthetics, except for halothane at the light anesthetic level, tended to decrease SAR activities depending on the anesthetic level, suggesting attenuation of the Hering- Breuer inflation reflex.
KW - Control of breathing
KW - Dog
KW - Pulmonary stretch receptor
KW - Vagal afferents
KW - Volatile anesthetics
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U2 - 10.1007/PL00007601
DO - 10.1007/PL00007601
M3 - Article
C2 - 9638638
AN - SCOPUS:0031745739
VL - 176
SP - 181
EP - 190
JO - Pneumonologie. Pneumonology
JF - Pneumonologie. Pneumonology
SN - 0341-2040
IS - 3
ER -