Which heart sound is noted at the end of S2 during late diastole?

The heart sound noted at the end of S2 during late diastole is S3. This sound occurs shortly after S2 and is associated with the rapid filling phase of the ventricles. It is often described as a low-frequency sound that can be indicative of increased ventricular filling pressures, which may be seen in conditions such as heart failure or volume overload. An S3 sound can be a normal finding in younger individuals and athletes, reflecting a healthy, compliant ventricle.

Recognizing S3 is important in clinical practice, as it provides valuable information about a patient's hemodynamic status. Identifying when it occurs and what it might suggest about the patient's heart function aids in assessing various cardiovascular conditions. Understanding S3's relationship with the cardiac cycle enhances a clinician's ability to interpret heart sounds accurately and make informed decisions regarding patient care.