The nurse is preparing to auscultate a patient's heart sounds. At which location will S1 be heard the loudest?
1. left midclavicular line at the fifth intercostal space
2. left sternal border at the fifth intercostal space
3. right midclavicular line at the fifth intercostal space
4. right sternal border at the third intercostal space
Correct Answer: 1
S1 is the sound produced by the atrioventricular (AV) valves closing and is heard the best at the left midclavicular line, fifth intercostal space. The sound is audible at the left sternal border, but would not be as loud. This sound would not normally be audible on the right midclavicular line at the fifth intercostal space, nor at the sternal border.
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