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 B
Explanation
Frothy sputum is a sign of left-sided heart failure, due to the pulmonary congestion and impaired gas exchange. The sputum may be pink-tinged or blood-streaked, indicating pulmonary edema.
a. Dependent edema is more likely to be seen in clients who have right-sided heart failure, due to the increased venous pressure and fluid retention. The edema is usually symmetrical and affects the lower extremities, abdomen, and sometimes the face.
c. Nocturnal polyuria is not a specific finding of left-sided heart failure, but it may occur in clients who have renal impairment, diabetes mellitus, or diuretic therapy.
d. Jugular distention is another sign of right-sided heart failure, due to the increased central venous pressure and backward flow of blood into the superior vena cava. It is visible as a bulging of the neck veins, especially when the client is in a semi-Fowler's position.
Correct Answer is ["125"]
Explanation
To calculate the infusion rate, the nurse should use the following formula:
Infusion rate (mL/hr) = Volume (mL) / Time (hr)
Plugging in the given values, the nurse should get:
Infusion rate (mL/hr) = 250 mL / 2 hr
Infusion rate (mL/hr) = 125 mL/hr
The nurse should round the answer to the nearest whole number and use a leading zero if it applies. Therefore, the nurse should set the IV pump to deliver 125 mL/hr.
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