The nurse detects a possible extra heart sound while assessing an adult client. To verify this finding, which action should the nurse take?

Choice A rationale Obtaining a pulse oximeter reading from two extremities assesses peripheral oxygen saturation and perfusion. While vital for overall circulatory status, it does not provide direct auditory information about cardiac events and therefore cannot assist in identifying or characterizing extra heart sounds. Choice B rationale The bell of the stethoscope is specifically designed to effectively detect low-frequency sounds. Many extra heart sounds, such as S3 (ventricular gallop) and S4 (atrial gallop), are low-pitched and are best appreciated by applying the bell lightly to the chest wall, allowing these subtle vibrations to be transmitted. Choice C rationale Auscultating for one minute with the stethoscope's diaphragm is primarily used for higher-pitched sounds, such as S1, S2, and certain murmurs. The diaphragm filters out lower frequencies, making it less effective for detecting and characterizing the subtle, often low-pitched, extra heart sounds. Choice D rationale Using a Doppler ultrasound primarily detects and amplifies blood flow, often used for assessing peripheral vascular sounds or fetal heart tones. It does not provide the nuanced acoustic fidelity required for differentiating and characterizing distinct extra heart sounds that signify specific cardiac abnormalities in an adult.