What Is the Fourth Ventricle?
Heart sounds are mechanical vibrations caused by factors such as myocardial contraction and relaxation, valve opening and closing, and blood flow impacting the ventricular wall and aorta during the cardiac cycle. They are transmitted to the chest wall through the surrounding tissues. Parts, the sound heard.
Fourth heart sound
Right!
- Chinese name
- Fourth heart sound
- the reason
- Myocardial contraction and relaxation, valve opening and closing
- Aka
- Atrial sound
- Generation mechanism
- Appears at the end of ventricular diastole, before systole
- Heart sounds are mechanical vibrations caused by factors such as myocardial contraction and relaxation, valve opening and closing, and blood flow impacting the ventricular wall and aorta during the cardiac cycle. They are transmitted to the chest wall through the surrounding tissues. Parts, the sound heard.
- It is usually easy to hear the first and second heart sounds, and sometimes in some cases the third or fourth heart sound is heard. The third heart sound can be heard in some adolescents. The fourth heart sound is generally inaudible. If you hear the fourth heart sound, it is pathological.
- The fourth heart sound is the vibration generated by the atrial muscles contracting forcefully to overcome the end-diastolic pressure at the end of systole. It is also called atrial sound.
- Production mechanism: Appears at the end of ventricular diastole, before the systole. It is generally believed that the production of the fourth heart sound is related to the sudden tension and vibration of the atrioventricular valve and its related structures (valve, annulus, chordae, and papillary muscles) due to atrial contraction. [1]
- Auscultation characteristics: The apex and its inner side are obvious, low-key, heavy and weak. Is pathological. [1]