THE EFFECTS OF THYROID FEEDING ON THE HEART RATE IN NORMAL DOGS AND IN DOGS WITH COMPLETELY DENERVATED HEARTS

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Abstract
The heart rate in 4 dogs with complete cardiac denervation did not change in response to slight movements. This is not the case when vagotomy and removal of the stellate ganglia are performed. The tachycardia of chronic experimental hyperthyroidism was practically identical in dogs with complete heart denervation and in 3 dogs with all the cardiac nerves intact. The rate of loss of body weight and temp. elevation on comparable doses of thyroid hormone is the same in normal and in the heart denervated dogs, but the latter animals are more incapacitated (asthenic) by the hyperthyroidism .

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