A nurse is preparing to administer digoxin to a client who has heart failure.
Before administering this medication, which of the following actions should the nurse take?

Choice A rationale:

Administer IV morphine. Administering IV morphine may be necessary for pain management in a client with a pulmonary embolism. However, pain relief should not take precedence over ensuring the patient's oxygenation and cardiovascular stability. Oxygen therapy is the top priority to address hypoxia and prevent further deterioration. Once oxygenation is secured, pain management can be considered.

Choice B rationale:

Start an IV infusion of lactated Ringer's. Initiating an IV infusion of lactated Ringer's solution may be important for maintaining hydration and electrolyte balance in a patient with a pulmonary embolism. However, this is not the top priority when a client is at risk of or experiencing a pulmonary embolism. Ensuring oxygenation and cardiovascular stability takes precedence. Once the patient is stable, intravenous fluids can be administered if needed.

Choice D rationale:

Initiate cardiac monitoring. Initiating cardiac monitoring is important in assessing the patient's cardiac rhythm and identifying any dysrhythmias or changes that may occur due to the pulmonary embolism. While this is a vital step, it is not the highest priority when the client is in a state of hypoxia and respiratory distress. Oxygen therapy should be the first intervention to address the immediate threat to the patient's life.

The correct answer is Choice D: Headache.

Rationale for Choice D (Headache): Hyponatremia, defined as a serum sodium level below 135 mEq/L, can lead to various neurological symptoms due to the altered osmotic pressure in the brain cells. When the sodium level drops below normal, water moves into the cells, causing them to swell, which can lead to increased intracranial pressure and subsequent headaches. Therefore, a client with a sodium level of 128 mEq/L is likely to experience headaches as a manifestation of hyponatremia.

Rationale for other choices:

Choice A: Hyporeflexia Hyporeflexia refers to diminished or absent reflexes. While hyponatremia can affect neurological function, hyporeflexia is not a typical manifestation. Instead, hyperreflexia may occur in severe cases due to cerebral edema and increased intracranial pressure.

Choice B: Constipation Constipation is not a common manifestation of hyponatremia. Gastrointestinal symptoms such as nausea, vomiting, and abdominal cramping may occur, but constipation is not typically associated with sodium imbalances.

Choice C: Increased appetite Hyponatremia does not typically cause increased appetite. Instead, gastrointestinal symptoms such as nausea and anorexia are more commonly observed. Increased appetite is not directly related to sodium levels but may be seen in conditions such as hyperthyroidism or certain medications.

Therefore, based on the provided data and typical manifestations of hyponatremia, the correct answer is Choice D: Headache. This is because headaches are a common neurological symptom associated with low sodium levels and increased intracranial pressure.