After age 40, a pathologic S3 usually indicates which conditions?

After age 40, a pathologic S3 usually indicates which conditions?

• A. LV failure or diastolic volume overload from anemia, thyrotoxicosis, VSD or MR
• B. Aortic stenosis only
• C. Pulmonary embolism
• D. Tricuspid regurgitation

Answer: (A)

A pathologic S3 in adults over age 40 signals left-sided volume overload or systolic dysfunction, meaning the left ventricle is dealing with high filling pressures or an increased end-diastolic volume. This rapid early diastolic filling into a dilated or hyperdynamic ventricle produces the extra sound. Conditions that create diastolic volume overload or boost LV volume—such as a high-output state from anemia or thyrotoxicosis, or left-to-right shunts like a VSD or mitral regurgitation—promote this S3. In contrast, aortic stenosis typically yields an S4 from a stiff ventricle, pulmonary embolism is more about acute right‑sided strain, and tricuspid regurgitation involves the right heart with characteristic murmurs rather than a left-sided S3. So the combination of LV failure and diastolic volume overload states best explains the finding.

A pathologic S3 in adults over age 40 signals left-sided volume overload or systolic dysfunction, meaning the left ventricle is dealing with high filling pressures or an increased end-diastolic volume. This rapid early diastolic filling into a dilated or hyperdynamic ventricle produces the extra sound. Conditions that create diastolic volume overload or boost LV volume—such as a high-output state from anemia or thyrotoxicosis, or left-to-right shunts like a VSD or mitral regurgitation—promote this S3.

In contrast, aortic stenosis typically yields an S4 from a stiff ventricle, pulmonary embolism is more about acute right‑sided strain, and tricuspid regurgitation involves the right heart with characteristic murmurs rather than a left-sided S3. So the combination of LV failure and diastolic volume overload states best explains the finding.