It has been determined that a patient has a high preload. Which of the following will occur with this patient?
1. stroke volume will be low
2. stroke volume will be high
3. stroke volume will be unchanged
4. afterload will increase
2
Rationale: The greater the volume of blood in the ventricle, the greater the amount of stretch that the fibers experience. Preload is greatly affected by the volume of blood delivered to the heart from the venous system. If a large volume of blood returns from the venous system to the ventricle, the myocardial fibers will be stretched so that they are far apart. This represents a high preload. High preload corresponds to high volume; low preload corresponds to low volume. If afterload increases, stroke volume decreases.
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