A patient asks which conditions will cause his heart to need more oxygen. The nurse answers with which statement(s)?
1. "Increasing physical activity."
2. "Watching a television show."
3. "Emotional stress."
4. "Eating a meal."
5. "Listening to music."
Correct Answer: 1,3
Rationale 1: Increased physical activity requires more cardiac output, increasing the work of the heart and increasing myocardial oxygen demand.
Rationale 2: Watching a television show generally does not require more cardiac output.
Rationale 3: Emotional stress causes epinephrine release, increasing heart rate and contractility and increasing myocardial oxygen demand.
Rationale 4: Eating a meal generally does not require more cardiac output.
Rationale 5: Listening to music generally does not require more cardiac output.
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