A nurse is reinforcing teaching with a newly licensed nurse about reading a client's ECG tracing. The nurse should include in the teaching that the P wave represents which of the following cardiac electrical activities?
Late ventricular repolarization
Ventricular depolarization
Early ventricular repolarization
Atrial depolarization
The Correct Answer is D
A. Late ventricular repolarization: Late ventricular repolarization is represented by the T wave on an ECG, not the P wave.
B. Ventricular depolarization: Ventricular depolarization is represented by the QRS complex, not the P wave.
C. Early ventricular repolarization: Early ventricular repolarization is not related to the P wave. It is part of the T wave, which represents repolarization of the ventricles.
D. Atrial depolarization: The P wave represents atrial depolarization, which is the electrical activity that triggers the contraction of the atria.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Orthopnea: Orthopnea is more commonly associated with left-sided heart failure.
B. Dyspnea: Dyspnea is more indicative of left-sided heart failure, where fluid backs up into the lungs, causing difficulty breathing.
C. Peripheral edema: Peripheral edema is a classic symptom of right-sided heart failure due to the backup of blood in the systemic circulation, leading to fluid retention in the lower extremities.
D. Frothy sputum: Frothy sputum is typically associated with left-sided heart failure due to pulmonary congestion and edema.
Correct Answer is D
Explanation
A. Serum sodium level of 140 mEq/L (136-145): A sodium level of 140 mEq/L is within the normal range and does not warrant withholding furosemide.
B. Serum potassium level of 4.8 mEq/L (3.5-5.0): A potassium level of 4.8 mEq/L is also within the normal range, and this finding would not be a reason to withhold furosemide.
C. Oxygen saturation of 95%: An oxygen saturation of 95% is within normal limits and would not be a contraindication to administering furosemide.
D. Blood pressure of 80/40 mm Hg: Furosemide is a potent diuretic that can further lower blood pressure. A blood pressure of 80/40 mm Hg is already hypotensive, and administering furosemide could exacerbate this, potentially leading to shock. Therefore, the medication should be withheld.
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