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近年来,由于心脏生理、血液动力学和心音图等的研究取得较大进展,因而对心音产生机制有了新的认识。一、正常心音产生机制正常心音按其出现顺序分别称为第一心音(S_1)、第二心音(S_2)、第三心音(S_3)和第四心音(S_4),临床上经常听到的只是S_1和S_2部分儿童和青少年可听到S_3,少数50岁以上的人可听到S_4。多数学者认为四个心音的产生都是由于血液加速和减速运动引起心脏结构的振动。
In recent years, due to the great progress made in the research of cardiac physiology, hemodynamics and phonocardiogram, etc., new understanding has been given to the mechanism of heart sound production. First, the normal heart sound production mechanism Normal heart sounds in accordance with the order of their appearance were called the first heart sound (S_1), the second heart sound (S_2), third heart sound (S_3) and fourth heart sound (S_4), clinically often heard Only S_3 can be heard in children and adolescents in S_1 and S_2, and S_4 can be heard in a few people over 50 years of age. Most scholars believe that the generation of four heart sounds are due to the acceleration and deceleration of blood flow caused by heart vibration.