A nurse is auscultating a client’s heart sounds and hears a third heart sound (S3). Which finding is consistent with the presence of an S3 sound in a client with congestive heart failure?
A.
High-pitched, scratchy sound heard during inhalation
B.
Extra heart sound heard immediately after S1 and S2
C.
Prolonged, whooshing sound heard during systole
D.
Irregular heart rhythm with varying intensity
The correct answer and Explanation is :
The correct answer is:
B. Extra heart sound heard immediately after S1 and S2
Explanation:
The third heart sound (S3), also known as a ventricular gallop, is typically heard just after the second heart sound (S2), which marks the end of ventricular systole and the beginning of ventricular diastole. It occurs during the early rapid filling phase of the ventricles when blood flows from the atria into the ventricles. In clients with congestive heart failure (CHF), S3 is a hallmark of volume overload, indicating that the ventricles are dilated and unable to pump blood efficiently.
S3 is produced by the sudden deceleration of blood flow into the dilated, non-compliant ventricle. In congestive heart failure, the heart cannot effectively pump blood, leading to an increase in pressure in the ventricles. This results in the early filling phase occurring more forcefully, producing the S3 sound.
This sound is often described as a low-pitched, “dull thudding” sound and is best heard using the bell of the stethoscope at the apex of the heart, with the client lying in the left lateral position. It is commonly described as sounding like the word “Kentucky,” with the S1 and S2 representing the “Ken” and “tuc,” and the S3 representing the “ky.”
In contrast, the other options do not describe the characteristics of an S3 sound:
- A refers to a pleural friction rub, common in pericarditis.
- C describes a systolic murmur, often associated with valvular heart diseases.
- D suggests an arrhythmia or irregular heart rhythm, unrelated to an S3 gallop.
In summary, S3 is an abnormal heart sound often associated with heart failure and indicates impaired ventricular function due to volume overload.