Which murmur typically radiates to the left axilla?

Mitral regurgitation is characterized by a holosystolic (or pansystolic) murmur that occurs due to the backflow of blood from the left ventricle into the left atrium when the left ventricle contracts. This type of murmur is typically heard best at the apex of the heart, which is located in the fifth intercostal space at the midclavicular line.

One of the distinctive features of mitral regurgitation is that it commonly radiates to the left axilla. This radiation occurs because the sound waves generated by the turbulent blood flow travel through the heart's structures and can be perceived in adjacent areas, such as the left axillary region. The anatomy and position of the heart allow this sound to propagate towards the axilla, making it a classic finding in the setting of mitral regurgitation.

In contrast, the other murmurs listed are associated with different anatomical conditions and areas of radiation. Aortic regurgitation typically radiates to the left sternal border or the carotids, while pulmonary stenosis often has a peak in intensity in the second intercostal space and may radiate to the neck. Tricuspid stenosis produces a murmur best heard at the