A nurse is caring for a 65-year-old female client in the emergency department. Select the landmarks that are used to find the PMI to auscultate the apical pulse.

Choice A rationale: The angle of Louis, or the sternal angle, is an important anatomical landmark located at the junction of the manubrium and body of the sternum. It helps locate the second rib and second intercostal space, providing a starting point for counting ribs and spaces to identify the correct level for PMI assessment. Choice B rationale: The second intercostal space lies just below the second rib, identified by palpating down from the angle of Louis. It is the reference point used to count down to the fifth intercostal space where the PMI is located, enabling accurate localization of cardiac landmarks during auscultation. Choice C rationale: The fifth intercostal space is the level where the PMI is typically found. This space lies below the fourth rib and corresponds to the apex of the heart in most adults. Locating this space is essential for accurate auscultation of the apical pulse. Choice D rationale: The left midclavicular line is a vertical line drawn down from the midpoint of the left clavicle. The PMI is most often located at the intersection of the fifth intercostal space and this line, making it a critical landmark for cardiac examination. Choice E rationale: The sternum itself is a midline bone and not used directly to locate the PMI. While it provides structural support and serves as a reference for the angle of Louis, it is not a landmark for auscultating the apical impulse, which is lateral to the sternum.