Chapter 9 - The Cardiovascular System University of New Hampshire NURS 807 .

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Bates’ Guide to Physical Examination and History Taking, 11th Edition Chapter 9: The Cardiovascular System Multiple Choice 1. You are performing a thorough cardiac examination. Which of the follo... wing chambers of the heart can you assess by palpation? A) Left atrium B) Right atrium C) Right ventricle D) Sinus node Ans: C Chapter: 09 Page and Header: 323, Anatomy and Physiology Feedback: The right ventricle occupies most of the anterior cardiac surface and is easily accessible to palpation. The other structures are less likely to have findings on palpation and the sinus node is an intracardiac structure. You may be able to diagnose abnormal rhythms caused by the sinus node indirectly by palpation, but this is less obvious. 2. What is responsible for the inspiratory splitting of S2? A) Closure of aortic, then pulmonic valves B) Closure of mitral, then tricuspid valves C) Closure of aortic, then tricuspid valves D) Closure of mitral, then pulmonic valves Ans: A Chapter: 09 Page and Header: 323, Anatomy and Physiology Feedback: During inspiration, the closure of the aortic valve and the closure of the pulmonic valve separate slightly, and this may be heard as two audible components, instead of a single sound. Current explanations of inspiratory splitting include increased capacitance in the pulmonary vascular bed during inspiration, which prolongs ejection of blood from the right ventricle, delaying closure of the pulmonic valve. Because the pulmonic component is soft, you may not hear it away from the left second intercostal space. Because it is a low-pitched sound, you may not hear it unless you use the bell of your stethoscope. It is generally easy to hear in school-aged children, and it is easy to notice the respiratory variation of the splitting. [Show More]

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