Medical transactions / Royal College of Physicians of London.

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Licence: Public Domain Mark

Credit: Medical transactions / Royal College of Physicians of London. Source: Wellcome Collection.

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    neceffarily have much impeded the tranfmiffion of blood through thofe parts, and thereby have occafioned dyfpncea, &c.; yet thefe, though they greatly aggravated the fymptoms, were by no means the caule of the dileale. 'The origin of this diforder is here evi¬ dently to be traced from the indura¬ tion of the femilunar valves; which exifted, probably, in a lefs degree for feveral years, and increaled gradually till it came to a boney hardnefs and immobility. From the inftant this rigidity in the valves firft began, the circulation through the heart, and con- fequently through the lungs, was in fome degree impeded: but when at laft they became fo much indurated as to f ' ' be hardly moveable, the blood mull have been propelled into the aorta with great difficulty; and probably part of it regurgitated again into the ventricle during the fyjfole of the artery. By this obftacle to the circu- C 2 lation, l