A nurse is reviewing the electrocardiogram (ECG) results. Which portion of the conduction system does the nurse consider when evaluating the P wave?
SA node
AV node
Bundle of His
Purkinje fibers
The Correct Answer is A
A. The P wave represents atrial depolarization, which is initiated by the SA node, the heart's natural pacemaker.
B. The AV node is responsible for conducting impulses from the atria to the ventricles but does not initiate the P wave.
C. The Bundle of His transmits the electrical impulses to the ventricles but is not directly associated with the P wave.
D. Purkinje fibers are involved in ventricular depolarization, which corresponds to the QRS complex, not the P wave.
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Correct Answer is D
Explanation
A. Grief evaluation refers to assessing the grief process rather than actively engaging in supportive dialogue, which is not the primary focus of the nurse's action.
B. Pain-management techniques would not apply directly to this context, as the discussion centers on emotional support rather than physical pain.
C. Palliative care encompasses a broader approach to managing patients with serious illnesses but does not specifically address the emotional support provided in this situation.
D. The nurse's action of discussing the child's life and death helps the parents express their grief and memories, thereby facilitating normal mourning, making this the most appropriate principle demonstrated.
Correct Answer is C
Explanation
A. Weak quadriceps muscles can occur with electrolyte imbalances, but the provided values do not indicate hypokalemia or other issues causing muscle weakness.
B. Decreased deep tendon reflexes are generally associated with elevated calcium levels or other electrolyte disturbances but are not specifically indicated by the given lab values.
C. A calcium level of 4.5 mg/dL is significantly low (normal range is typically around 8.5-10.5 mg/dL), which can lead to hypocalcemia symptoms such as tingling of the extremities and tetany due to increased neuromuscular excitability.
D. Light-headedness when standing up (orthostatic hypotension) is more related to fluid volume status or dehydration rather than directly related to the given electrolyte levels.