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