. Diseases of the heart and thoracic aorta. on the cause of the condition. Occurring per se,without any associated signs and symptoms of disease, thecondition is of no practical importance. When there areother signs and symptoms the prognosis depends entirelyupon their cause. TJie chief pathological conditions associated zvith irregu-larities in time and volume are—? I. Functional derangements of the heart, such as are pro-duced by hysterical conditions, venereal excess, gout, tobacco,tea, etc. Physiologists have shown that when the excised heart is fed withrabbits serum its action is apt to b
. Diseases of the heart and thoracic aorta. on the cause of the condition. Occurring per se,without any associated signs and symptoms of disease, thecondition is of no practical importance. When there areother signs and symptoms the prognosis depends entirelyupon their cause. TJie chief pathological conditions associated zvith irregu-larities in time and volume are—? I. Functional derangements of the heart, such as are pro-duced by hysterical conditions, venereal excess, gout, tobacco,tea, etc. Physiologists have shown that when the excised heart is fed withrabbits serum its action is apt to become intermittent. This in-termittence is possibly due to the chemical action of the serum. Various chemical substances in the blood (natural or morbid), saysMichael Foster, may thus affect the hearts beat, by acting on itsmuscular fibres, its retlex or automatic ganglia, or its intrinsic inhibitoryapparatus. 2. Mitral lesions, both stenosis and regurgitation, especiallyafter compensation has failed. (See figs. 116, 117, 118 and 119.). Fressiire 3f 116.—Irregularity of the pidse.—W. M., ast. 50, admitted to Newcastle In-firmary 30th November 1878, suffering from the usual symptoms of mitraldisease. The hearts action was extremely irregular. The left ventriclewas much hypertrophied. There was no rheumatic history. The symptomswere of two months duration. A Text-Book of Physiology, third editior, p. 2 74 Diseases of the Heart.
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