Which valve lesion produces a murmur of equal intensity throughout systole?

The correct answer reflects that mitral insufficiency produces a holosystolic or pansystolic murmur that is typically of equal intensity throughout the entire systole. This type of murmur occurs due to the backflow of blood from the left ventricle into the left atrium when the ventricles contract. The continuous and uniform nature of the murmur is a distinguishing feature, making it different from other types of murmurs that may vary in intensity at different phases of the cardiac cycle.

For instance, aortic stenosis generally generates a systolic ejection murmur that crescendos and then decrescendos as the left ventricle ejects blood. This variation in intensity does not produce a uniform sound throughout systole.

Tricuspid stenosis, while it may create a murmur during diastole due to restricted flow from the right atrium to the right ventricle, does not contribute to a continuous murmur throughout systole. Similarly, pulmonic regurgitation is characterized by a diastolic murmur that occurs due to backflow of blood from the pulmonary artery into the right ventricle during diastole, which is also not present during the entirety of systole.

Hence, the unique characteristic