Mechanical vibration

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...and leaving the corresponding lung, owing to contraction of the bronchial muscles. Kingscote states moreover, that this procedure causes simultaneously spasmodic contraction of the diaphragmatic muscle." According to "Lefevre,t Salter, Trousseau, C. J. B. Williams, and many others, the spasmodic contraction of the bronchial muscles by greatly narrowing the calibre of the bronchi, provokes the asthma." Stricto-dilation of bronchial arterioles causes congestion of all the bronchial elements and hyperemic swelling. Sajous also notes, that researches show the absence of venous trunks in the bronchial mucosa, so it is supplied only with capillaries. In an attack these capillaries become hypersemic. An attack is relieved by depleting them. They "can be depleted as soon as the excess of blood supplied to them is reduced.' Sajous believes that "a hypersensitiveness of the vagal center jn the posterior pituitary body is a predisposing cause of asthma. Poisons act on the bronchial sensory end-organs of the vagus." These cause afferent impulses which are transmitted to the vagal center. Normally they would cause "periodical contractions of the bronchi, but being hypersensitive the center projects violent stimuli to the bronchial muscles and mucosa," which causes broncho-stenosis, which in turn causes the asthma. Since broncho-stenosis is due principally to contraction of the bronchial muscles and congestive swelling of the bronchial mucous membrane, and the swelling is due to stricto-dilation of the arterioles the first indication is to contract the arterioles and lessen the quantity of blood sent to them. Constriction of the arterioles is by means of the sympathetic fibres. Sajous. The Internal Secretions and the Principles of ...