Which of the following statements best explains what happens to ...

[CQXA]

Which of the following statements best explains what happens to cardiac output when the heart rate gets extremely high?
 
  1. Cardiac output is not generally affected by rapid heart rates.
  2. Cardiac output lowers when the rapid rate doesn't allow enough time for complete filling of the heart chambers.
  3. Cardiac output will continue to increase as long as the heart rate continues to increase.
  4. Cardiac output will increase until the heart rate reaches 150 bpm, at which time it will no longer be affected.

Question 2

The patient receives verapamil (Calan). The patient tells the nurse that he is nervous about taking this medicine. What is the best response by the nurse?
 
  1. This medicine is safe, and most patients do very well with it.
  2. This medicine increases your blood pressure, but we will be monitoring that.
  3. This medicine has many side effects, but you should be okay.
  4. This medicine is a potassium channel blocker and is considered safe.

[emily12345]

Answer to Question 1

Correct Answer: 2
Rationale: Cardiac output lowers when the rapid rate doesn't allow enough time for complete filling of the heart chambers.

Answer to Question 2

Correct Answer: 1
Rationale: Calcium channel blockers are safe medications that are well tolerated by most patients. All medications have side effects, but telling the patient that he should be okay is not very reassuring. Verapamil (Calan) is a calcium channel blocker, not a potassium channel blocker. Verapamil (Calan) lowers, not increases, blood pressure and decreases cardiac workload.

[CQXA]

Thank you!

[emily12345]

Always glad to help...