The nurse is concerned about a patient's cardiac output. Which of the following will help the nurse determine this patient's cardiac output?
1. as stroke volume decreases and heart rate increases
2. as stroke volume decreases and heart rate decreases
3. as stroke volume increases and heart rate increases
4. as stroke volume maintains and heart rate maintains
1
Rationale: Stroke volume and heart rate form an interrelationship to keep cardiac output at the level needed by the body. This is a compensatory mechanism that is an inverse relationship. If the stroke volume decreases, the heart rate increases to compensate. If the heart rate decreases, the stroke volume increases to compensate.
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