During inspiration, the venous blood flow into the right atrium and ventricle are increased, which increases the stroke volume of the right ventricle during systole. As a result, the leak of blood from the right ventricle into the right atrium is larger during inspiration, causing the murmur to become louder. During expiration, the leak of blood backwards through the tricuspid valve is lessened, making the murmur more quiet. Conversely, the murmur of mitral regurgitation becomes louder during expiration due to the increase in venous return from the pulmonary veins to the left heart.
Carvallo's sign
Winterbottom's sign
Dance's sign
Darier's sign
Kelly's sign
Froment's sign
Dahl's sign
Hegar's sign