The time between A2 and P2 is variable depending on the respiratory rate, but the split is generally only prominent in children during inspiration. In adults and during expiration, the split is usually not long enough to suggest two sounds. Abnormal heart sounds may indicate problems with the health of the valves. Murmurs may also be caused by valve stenosis improper opening and cardiac shunts, a severe condition in which a defect in the septum allows blood to flow between both sides of the heart.
Learn more and compare subscriptions content expands above. Full Terms and Conditions apply to all Subscriptions. Or, if you are already a subscriber Sign in. Other options. Close drawer menu Financial Times International Edition. Search the FT Search. The first heart sound is made up of several components, although the most audible components heard at the bedside are the high frequency vibrations related to mitral and tricuspid closure. Generally, the louder sound of mitral closure drowns out the softer sound of tricuspid closure.
What is the lub dub sound of a heartbeat? Category: medical health heart and cardiovascular diseases. The sound of a heartbeat is caused by the heart valves opening and closing as they pump blood. The" lub " is the sound of the tricuspid and mitral valves closing. The" DUB " is the sound of the aortic and pulmonary valves closing.
What are the lub dub sounds? What do the heart sounds mean? What does s1 and s2 sound like? What is systole and diastole? Where do you listen to s1 and s2 heart sounds? What causes the heart sounds heard with a stethoscope? What causes an s3 heart sound? Which heart sound is the loudest? What are s3 and s4 sounds? What causes an s4 heart sound?
Murmurs can occur when blood is forced to flow through a narrowed valve called stenosis , or when it leaks back through a defective valve called regurgitation. These valve problems may be present at birth congenital or develop later in life because of rheumatic fever , coronary artery disease , infective endocarditis , or aging.
Conditions such as pregnancy, anemia, high blood pressure, fever, or an overactive thyroid gland may also cause a heart murmur that comes and goes. Most people with a heart murmur do not have symptoms.
Usually the murmur is found during a physical exam for other symptoms, such as chest pain, shortness of breath, fatigue, or the presence of a blue coloring to the skin or fingertips called cyanosis. In most cases, your doctor will be able to hear your heart murmur by using a stethoscope to listen to your heart a technique called cardiac auscultation.
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