Difficulty: Medium
Average Score: 88%
Simulated
A student nurse is precepting on the cardiac unit with the charge nurse. The charge nurse is educating the student about heart sounds and asks the student nurse to describe what causes the S1 sound. Which response by the student nurse reflects an understanding of cardiac sounds?
Correct answer
A
Rationale
S1 is caused by the closure of mitral and tricuspid valves (A) at the start of systole. Pulmonic and aortic valves (C) cause S2, and other combinations (B, D) are incorrect.