Final answer:
Auscultation, or listening to a patient's heart sounds, is a useful diagnostic tool in assessing left-sided heart function due to heart failure.
Step-by-step explanation:
Auscultation, or listening to a patient's heart sounds, is one of the most useful diagnostic tools in assessing the client's left-sided heart function. By using a stethoscope, the nurse can listen for abnormal heart sounds, such as crackles or murmurs, which can indicate left-sided heart failure. These abnormal sounds may be heard during the client's inhalation or expiration, and can provide specific information about the client's left-side heart function.