A nurse is auscultating heart sounds on a client and hears an extra sound late in diastole, just before the S1. How should the nurse document this finding?

A) The third heart sound (S3): The third heart sound (S3) occurs early in diastole, immediately following S2. It is often associated with conditions that cause increased volume and pressure in the ventricles, such as heart failure or dilated cardiomyopathy. S3 is not heard late in diastole, so it does not match the described timing of the extra heart sound. B) The fourth heart sound (S4): The fourth heart sound (S4) is heard late in diastole, just before S1. It is caused by the atria contracting forcefully to push blood into a non-compliant or stiff ventricle, often associated with conditions like left ventricular hypertrophy or ischemic heart disease. The timing of S4, occurring just before S1, makes it the correct identification of the described extra heart sound. C) A split second heart sound S2: A split S2 occurs when the aortic and pulmonic valves do not close simultaneously, causing the second heart sound (S2) to be heard as two distinct components. This split can vary with respiration but does not occur late in diastole. Therefore, it does not align with the extra heart sound heard just before S1. D) A friction rub: A friction rub is a sound associated with pericarditis, caused by the rubbing of inflamed pericardial layers. It has a distinct, grating quality and can be heard throughout the cardiac cycle. A friction rub is not a late diastolic sound, making it an incorrect identification for the extra heart sound described.