American Nurses Credentialing Center (ANCC) Practice Exam 2025 - Free ANCC Practice Questions and Study Guide

In the case of detecting a new grade 3 systolic murmur in a healthy 64-year-old patient, the appropriate next step is an echocardiogram. A systolic murmur, especially one that is new, can indicate underlying structural heart issues such as valve abnormalities, congenital heart defects, or other cardiovascular conditions. An echocardiogram is a non-invasive imaging test that utilizes ultrasound to visualize the heart's structure and function. This tool provides crucial information about the heart's valves, chambers, and overall hemodynamics, allowing for accurate diagnosis and management of potential cardiac problems.

In contrast, other diagnostic tests like a C-reactive protein test or troponin levels focus on inflammation or cardiac injury rather than providing the structural information required in this scenario. An electrocardiogram primarily assesses the electrical activity of the heart and may not uncover the underlying causes of a new murmur. Thus, the echocardiogram is the most relevant next step to evaluate the significance of the newly detected systolic murmur.