While percussing the borders of the heart, the nurse picks up an area of dullness beginning at the 5th left intercostal space and moving upward to the 2nd left intercostal space at the sternal border. What do these findings indicate?

Choice A rationale A benign variation would not typically present with a pattern of dullness extending from the 5th left intercostal space to the 2nd left intercostal space at the sternal border. This pattern suggests an abnormality rather than a benign variation. Choice B rationale Cardiac enlargement is indicated by an area of dullness extending from the 5th left intercostal space to the 2nd left intercostal space at the sternal border. This finding suggests an enlarged heart, which can be due to conditions such as cardiomegaly or left ventricular hypertrophy. Choice C rationale Cardiac atrophy refers to a decrease in the size or mass of the heart muscle, resulting in a smaller than normal heart. The described findings indicate dullness extending upward, suggesting an enlargement rather than atrophy of the heart. Choice D rationale An expected finding would not typically present with the described pattern of dullness. The normal area of cardiac dullness is more limited and does not extend as described.