A patient is diagnosed with aortic valve stenosis. Which of the following will this valve disorder effect?
1. afterload
2. heart rate
3. preload
4. contractility
1
Rationale: The major determinant of afterload is the resistance to flow caused by the arterial system. Resistance to flow can be caused by failure of the pulmonic or aortic valve to allow free flow of blood from the ventricle to the artery. In this case, the stenosed valve causes an increase in afterload. The stenosis will not affect heart rate, preload, or contractility.
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