四、sound of the heart examination clinical significance:

Chart 2 sound of the heart six kind of ingredients localizations schematic drawing

Chart 2 sound of the heart six kind of ingredients localizations schematic drawing

1st, introduction: The heart disease creates sick and disabled and the death common disease, In the developed country, the cardiovascular system disease has become the most common disease and the lethal important reason, But along with our country population old age, a cardiovascular disease proportion also year compared to one aged. cardiovascular diagnosis besides clinical, mainly depends upon the medical instrument. the heart electricity and the sound of the heart are examines the cardiovascular disease two different methods,The heart electricity mainly applies to the heart rate is abnormal and the cardic muscle lacks the blood qualitative and the quantitative analysis diagnosis, the cardiovascular medicine curative effect appraisal. The sound of the heart chart can effective make up the heart auscultation insufficiency,

The sound of the heart signal auscultation cannot record which the heart or is not easy to distinguish the signal to record with the graph form, analyzes the use for doctor . The sound of the heart chart union electrocardiogram, can greatly enhance the cardiovascular disease the distinction and the diagnosis level,

Regarding the understanding cardiovascular function, the choice treatment, the judgement pathology as well as studied certain diseases the mechanism all to provide the very valuable material, the application has been day by day widespread.

2nd, what is called the sound of the heart, the sound of the heart is how produces?

The sound of the heart is in the cardiac cycle,as a result of the cardic muscle contraction and the diastole, the valve opens shuts, blood stream impact factor and so on ventricle wall and aorta causes mechanical vibrations, Organizes through periphery to pass to chest, Tightly pastes the chest the ear or puts the stethoscope the sound which hears in the chest certain spotUsually is very easy to hear to first and the second sound of the heart, sometimes hears in certain situations to third or the fourth sound of the heart.

First sound of the heart: Occurs in the heart contraction time start,

Tonality low and deep, the duration to be longer (approximately for 0.15 second). Produces the reason including the ventricle myo- contraction, the atrioventricular valve suddenly closes as well as afterwards shoots the blood to be in charge the artery and so on the vibration which causes. First sound of the heart best auscultation spot in linea medioclavicularis fifth Rib gap or in breastbone right reason.

Second sound of the heart: Occurs in the heart diastole time start, the frequency high, the duration to be shorter (approximately for 0.08 second). Produces the reason is 半月瓣 the closure, the valve mutually hits as well as in the aorta the blood decelerates the vibration which causes with the room intrinsic pressure rapid drop. Second sound of the heart best auscultation spot right flank second rib gap aorta petal area and left side pulmonary artery petal area.

Third sound of the heart and fourth sound of the heart: The third sound of the heart occurs in the second sound of the heart latter 0.1 ~ 0.2 second, the frequency is low, Its production and the blood fast flow in the ventricle to cause the ventricle and the valve has the vibration related, Usually only can hear in the child, because is easier to conduct the body surface. The fourth sound of the heart causes by the atrium contraction, also calls the atrium sound.