A nurse is interpreting the ECG strip of a client who has bradycardia. Which of the following cardiac components should the nurse identify as the role of the P wave?
Slow repolarization of ventricular Purkinje fibers
Atrial depolarization
Early ventricular repolarization
Ventricular depolarization
The Correct Answer is B
The P wave is the first wave on the ECG strip and represents the electrical activity of the atria. It reflects the depolarization of the atrial myocardium, which is the process of changing the electrical charge of the cardiac cells from negative to positive, triggering a contraction. The P wave precedes the QRS complex, which represents ventricular depolarization, and the T wave, which represents ventricular repolarization.
The other options are not correct because:
a. Slow repolarization of ventricular Purkinje fibers. This statement is incorrect because it describes the U wave, which is a small and sometimes invisible wave that follows the T wave on the ECG strip. It reflects the repolarization of the ventricular Purkinje fibers, which are specialized cardiac cells that conduct electrical impulses to the ventricles. The U wave is more prominent in conditions that cause hypokalemia, such as diuretic use or vomiting.
c. Early ventricular repolarization. This statement is incorrect because it describes the ST segment, which is the flat line between the QRS complex and the T wave on the ECG strip. It reflects the early phase of ventricular repolarization, which is the process of restoring the electrical charge of the cardiac cells to negative after a contraction. The ST segment can be elevated or depressed in conditions that cause myocardial ischemia or injury, such as angina or myocardial infarction.
d. Ventricular depolarization. This statement is incorrect because it describes the QRS complex, which is the largest and most visible wave on the ECG strip. It reflects the depolarization of the ventricular myocardium, which triggers a ventricular contraction. The QRS complex follows the P wave and precedes the T wave on the ECG strip.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["50"]
Explanation
To calculate the gt/min, the nurse should use the following formula:
gt/min = (mL/hr x drop factor) / 60
Plugging in the given values, we get:
gt/min = (150 mL/hr x 20 gt/mL) / 60
gt/min = 3000 gt/hr / 60 gt/min = 50 gt/min
Therefore, the nurse should set the manual IV infusion to deliver 50 gt/min.
Correct Answer is C
Explanation
Choice A reason:
This statement is incorrect because it trivializes the patient's concerns and implies that enjoyment is the primary goal, which is not the case. The main purpose of cardiac rehabilitation is to improve health outcomes, not just to make the routine enjoyable.
Choice B reason:
While exercise is beneficial for heart health, this statement is too general and does not address the specific benefits of cardiac rehabilitation for someone who has had a myocardial infarction.
The correct answer is C:
"Cardiac rehabilitation cannot undo the damage to your heart but it can help you get back to your previous level of activity safely." Cardiac rehabilitation is crucial for patients who have experienced a myocardial infarction. It provides a structured program that includes exercise, education, and support to help patients improve their cardiovascular health and prevent future cardiac events.
Choice D reason:
Deferring to the doctor's expertise does not educate the patient about the benefits of cardiac rehabilitation. It's important for patients to understand why they are participating in the program.
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