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  • Title: Failure of heart rate response to cardioaccelerator nerve stimulation in Siamese cats.
    Author: Ilhan M, Long JP, Brody MJ.
    Journal: Lab Anim Sci; 1980 Aug; 30(4 Pt 1):657-60. PubMed ID: 6252369.
    Abstract:
    Heart rate responses during stimulation of the cardioaccelerator nerves were compared using Siamese and non-Siamese cats. The positive chronotropic responses of Siamese cats during activation of the cardioaccelerator nerves were significantly less than that observed for non-Siamese cats. There were no differences between the two cat populations when vasopressor and chronotropic responses to norepinephrine were cmpared. Comparison of atria from Siamese and non-Siamese cats using histochemical fluorescence indciated that there was a decreased norepinephrine content of the sympathetic nerves innervating the atria of Siamese cats.
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