sydänääniä
Sydänääniä refers to the sounds produced by the heart during the cardiac cycle. These sounds are primarily generated by the closure of heart valves. The normal heart sounds are typically described as "lub-dub".
The first heart sound, or "lub," is caused by the closure of the atrioventricular valves, namely the
The second heart sound, or "dub," is produced by the closure of the semilunar valves, the aortic
Variations or additional sounds can sometimes be heard. A third heart sound, or S3, can occur in
Listening to heart sounds with a stethoscope is a fundamental part of a physical examination. Physicians use