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Updated: June 17, 2025
It has long been known that the vasomotor, the cardiac, and the respiratory centers discharge energy in response to traumatic stimuli applied to various sensitive regions of the body during surgical anesthesia.
Probably such vasomotor effect enters in, changing the blood circulation in the brain, when a personal contact between the transmitter and receiver of the suggestion is brought about.
Then begins the physical examination, the study of his sense organs and his nerves, of the motor inabilities, the pains, the local anæsthesias and paræsthesias, the disturbances of the reflexes, of the spasms, tremors, convulsions, and incoördinations, of the vasomotor and trophic disorders, and so on.
Hyperthyroidism, or Graves' Disease, a condition in which there is overactivity of the thyroid gland and which is particularly prevalent among young women, is one of those diseases. In this condition excitability, irritability, emotional outbursts, fatigue, restlessness, digestive disorders, vasomotor disorders, appear before the characteristic symptoms do. Neuro-syphilis is another such disease.
The most frequent cause of such a reflex is abdominal pain, perhaps due to some serious condition in the stomach, to gastralgia, to an intestinal twist, to intussusception or other obstruction, or to hepatic or renal colic. A severe nerve injury anywhere may cause such a heart reflex. Hence serious nerve pain must always be stopped almost immediately, else cardiac and vasomotor shock will occur.
A certain sequence of nervous shocks and of vasomotor changes, certain stimulations and relations and contractions of the internal organs have been set up as the "diffusive wave" from the sense-stimulations, and a particular emotional tinge is the result. That is a direct impression, but an expression too. Take the same case on a much lower level.
Kennedy had been examining the books in the bookcase and now pulled out a medical dictionary. It opened readily to the heading, "Polyneuritis multiple neuritis." I bent over and read with him. In the disease, it seemed, the nerve fibers themselves in the small nerves broke down and the affection was motor, sensory, vasomotor, or endemic.
The conclusion reached after admitting possible objections to them is that, "the vasomotor theory of the production of emotion becomes, I think untenable, also that visceral presentations are necessary to emotion."
The more air that passes in and out of the lungs in a given time, the greater the loss of heat. And in such animals as the dog, who do not perspire easily by the skin, respiration becomes far more important. But for man the great heat regulator is undoubtedly the skin, which regulates heat loss by its vasomotor mechanism, and also by the nervous mechanism of perspiration.
While small, more or less undiluted closes of alcohol, as whisky or brandy, may cause quick stimulation of the heart by reflex irritation of the esophagus and stomach, vasodilatation occurs as soon as the alcohol is absorbed, and if large closes are absorbed, vasomotor paresis may occur, temporarily at least.
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