The nurse is reviewing the client's telemetry printout. Which of the following cardiac components should the nurse identify as the role of the P wave?
Ventricular depolarization
Early ventricular repolarization
Slow repolarization of ventricular Purkinje fibers
Atrial depolarization
The Correct Answer is D
Rationale:
A. Ventricular depolarization is incorrect because this is represented by the QRS complex on the ECG, not the P wave. Ventricular depolarization reflects the electrical impulse spreading through the ventricles, triggering ventricular contraction.
B. Early ventricular repolarization is incorrect because this is represented by the ST segment, which occurs after ventricular depolarization (QRS complex) and before the T wave. Repolarization is part of the recovery phase, not the P wave.
C. Slow repolarization of ventricular Purkinje fibers is incorrect because repolarization occurs primarily during the T wave, not during the P wave. The Purkinje fibers help conduct the impulse rapidly through the ventricles but do not define the P wave.
D. Atrial depolarization is correct because the P wave represents the electrical activity that triggers atrial contraction. It is the first positive deflection on a standard ECG, indicating that the SA node has fired and the atria are depolarizing, which precedes ventricular contraction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale:
A. Encourage the client to move to the left lateral position is incorrect because while positioning can help comfort and circulation, it does not correct uterine displacement or a boggy fundus. The primary concern is uterine atony due to bladder distention, not positioning.
B. Encourage the client to perform Kegel exercises is incorrect because Kegel exercises strengthen pelvic floor muscles but do not address uterine atony or displacement. They are appropriate for long-term pelvic floor recovery, not acute fundal management.
C. Assist the client to the bathroom to void is correct because a boggy and displaced fundus often indicates a full bladder, which prevents the uterus from contracting effectively. Urinary retention can lead to uterine atony and postpartum hemorrhage. Having the client void or using a catheter if necessary allows the fundus to return to midline and become firm, reducing bleeding risk.
D. Ask the client to rate her pain is incorrect because while assessing pain is part of routine postpartum care, it does not address the immediate priority of correcting fundal atony and displacement, which can lead to postpartum hemorrhage if left uncorrected.
Correct Answer is B
Explanation
Rationale:
A. Plan to administer a plain water enema and maintain contact precautions is incorrect because pyloric stenosis is not an infectious condition and does not require contact precautions. Enemas, especially plain water enemas, are contraindicated in infants due to the risk of causing severe electrolyte imbalance and water intoxication. This intervention does not address the underlying problem of vomiting and dehydration.
B. Monitor the infant for dehydration and electrolyte imbalance is correct because infants with pyloric stenosis experience projectile, non-bilious vomiting, which leads to significant loss of fluids and gastric electrolytes. This commonly causes metabolic alkalosis, hyponatremia, and hypokalemia. The infant in the scenario already shows signs of dehydration, including dry mucous membranes and a depressed anterior fontanel, making fluid and electrolyte monitoring the top priority. Restoring hydration and correcting electrolyte disturbances are essential before any surgical intervention (pyloromyotomy).
C. Measure the infant's head circumference and weigh the infant is incorrect because although weight monitoring is part of routine assessment, head circumference measurement is not a priority in the context of acute dehydration from pyloric stenosis. The immediate concern is stabilizing fluid and electrolyte status.
D. Offer the infant small, frequent feedings of thickened liquids is incorrect because infants with pyloric stenosis are typically NPO until after surgical correction. Continuing oral feedings would worsen vomiting and further dehydrate the infant. Feeding modifications are not an appropriate intervention at this stage.
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