《英文msh詞典》Sound,Heart
[入口詞] Sound,Heart
[主題詞] Heart Sounds
[英文釋義] The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of SYSTOLE and is heard as a lubb sound; the second is produced by the closing of the AORTIC VALVE and PULMONARY VALVE and is heard as a dupp sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the HEART ATRIA; and the fourth is produced by atrial contraction and ventricular filling.