Diseases of the heart and circulation in infancy and adolescence . complex sound,—the niiis-culo-valvular sound; themuscular element beingmade apparent by thestroke of the heart againstthe chest-wall and by theaudible contraction of thecardiac muscle. It is thelong, low, dull boom. Thesecond, or valvular, soundis short, clacking, abrupt,and ringing; it is almostpurely valvular, and isdue to the sudden closureof the semilunar valves,the aortic and this is happeningthe blood is slowly find-ing its way from auriclesto ventricles through theopened mitral and tricus-pid valves in or
Diseases of the heart and circulation in infancy and adolescence . complex sound,—the niiis-culo-valvular sound; themuscular element beingmade apparent by thestroke of the heart againstthe chest-wall and by theaudible contraction of thecardiac muscle. It is thelong, low, dull boom. Thesecond, or valvular, soundis short, clacking, abrupt,and ringing; it is almostpurely valvular, and isdue to the sudden closureof the semilunar valves,the aortic and this is happeningthe blood is slowly find-ing its way from auriclesto ventricles through theopened mitral and tricus-pid valves in order to pro-duce another systolic ac-tion. The aortic and pul-monary arteries at theirorigin, the chordae tendineae,and the whirl of blood inthe ventricles severally as-sist in the- production ofthe cardiac sounds. Justhow much of it they con-tribute is as yet a mootquestion. The sounds and pausesof the cardiac rhythm willperhaps be made clear bythe accompanying diagram-matic representation withwhich we have been accus- and Circulation in Infancy and Adolescenc
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectheartdi, bookyear1888
