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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effects of anesthetics on cardiovascular responses of the marmot Marmota flaviventris.

The effects of pentobarbital (30 mg/kg), urethan (2 g/kg), chloralose/urethan (50 mg/kg, 500 mg/kg), and thiobutabarbital (Inactin, 100 mg/kg) on the mean arterial pressure (BP) and heart period (HP) of Marmota flaviventris were examined. Anesthesia significantly decreased BP by 22-27 mm Hg and HP by 123-151 msec. In a series of paired studies with eight marmots it was found that pentobarbital increased the BP response to phenylephrine and almost abolished the baroreflex HP responses to phenylephrine and nitroglycerin. In another series of animals right carotid occlusion in unanesthetized animals produced greater changes in BP and HP than occlusion of the left carotid. Chloralose/urethan, urethan, or Inactin reduced the reflex BP response to unilateral carotid occlusion by 50% and the HP response by 96%. It was concluded that the anesthetic agents investigated depress baroreflex responses significantly by influencing efferent sympathetic and parasympathetic reflex responses. They, therefore, are not appropriate for cardiovascular studies in acute, anesthetized preparations of the marmot and, perhaps, other hibernating species.[1]


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