On arrival at the intensive care unit, a critically ill patient suffers respiratory arrest and is placed on mechanical ventilation. The physician orders pulse oximetry to monitor the patient’s arterial oxygen saturation (SaO₂) noninvasively. Which vital sign abnormality may alter pulse oximetry values?

Tachycardia

Hypotension

Tachypnea

Fever

Answer and Explanation

The Correct Answer is B

Choice A: Tachycardia

Tachycardia, defined as a heart rate exceeding 100 beats per minute, can affect the accuracy of pulse oximetry readings. When the heart beats too quickly, it may not fill with enough blood between beats, leading to reduced perfusion and oxygen delivery to tissues. However, while tachycardia can influence the readings, it is not the most significant factor compared to hypotension.

Choice B: Hypotension

Hypotension, or low blood pressure, significantly impacts pulse oximetry accuracy. When blood pressure is low, there is reduced perfusion to peripheral tissues, including the extremities where pulse oximeters are typically placed. This reduced perfusion can lead to inaccurate readings, as the device may not detect sufficient blood flow to measure oxygen saturation accurately. Hypotension is a critical factor that can alter pulse oximetry values, making it the most relevant choice.

Choice C: Tachypnea

Tachypnea, or rapid breathing, can affect oxygen levels in the blood but does not directly interfere with the pulse oximeter’s ability to measure oxygen saturation. While it indicates respiratory distress and can lead to hypoxemia, the pulse oximeter can still provide accurate readings unless accompanied by other factors like low perfusion.

Choice D: Fever

Fever can cause peripheral vasodilation, which might theoretically affect pulse oximetry readings by altering blood flow to the extremities. However, this effect is generally minimal compared to the impact of hypotension. Fever alone is unlikely to cause significant inaccuracies in pulse oximetry measurements.

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Free Nursing Study Resources

Correct Answer is ["A","B","C","D"]

Explanation

Choice A reason: Monitoring the heart rate is crucial when administering amiodarone, as this drug can cause bradycardia (a slower than normal heart rate). Amiodarone affects the electrical conduction system of the heart, and close monitoring helps ensure that the heart rate remains within a safe range. The normal resting heart rate for adults is typically between 60 and 100 beats per minute.

Choice B reason: Respiratory rate monitoring is essential because amiodarone can cause pulmonary toxicity, which may manifest as interstitial pneumonitis or pulmonary fibrosis. Early detection of respiratory changes can help prevent severe complications. The normal respiratory rate for adults is 12 to 20 breaths per minute.

Choice C reason: Monitoring heart rhythm is necessary because amiodarone is used to treat arrhythmias, and it can also cause new arrhythmias or exacerbate existing ones. Continuous ECG monitoring helps detect any abnormal rhythms early, allowing for prompt intervention. Normal sinus rhythm is characterized by a regular rhythm with a rate of 60 to 100 beats per minute.

Choice D reason: Cardiac output monitoring is important because amiodarone can affect the contractility of the heart and overall cardiac function. Cardiac output is a measure of the amount of blood the heart pumps in one minute, and it is crucial for ensuring adequate tissue perfusion. Normal cardiac output ranges from 4 to 8 liters per minute in adults.

A. Administer 0.45% NS at 50 mL/h. B. Obtain daily weight. C. Maintain seizure precautions. D. Administer 3% saline as ordered. E. Encourage fluid intake.

Correct Answer is ["B","C","D"]

Explanation

Choice A Reason:

Administering 0.45% NS (normal saline) at 50 mL/h is not appropriate for a client with SIADH (Syndrome of Inappropriate Antidiuretic Hormone Secretion). This solution is hypotonic and can exacerbate the condition by increasing water retention and worsening hyponatremia. Therefore, this choice is not included in the plan of care.

Choice B Reason:

Obtaining daily weight is crucial for monitoring fluid balance in clients with SIADH. Daily weights help detect fluid retention or loss, which is essential for managing the condition. Accurate weight measurements can indicate changes in fluid status and guide adjustments in treatment.

Choice C Reason:

Maintaining seizure precautions is vital for clients with SIADH because severe hyponatremia can lead to neurological symptoms, including seizures. Implementing seizure precautions helps ensure the client’s safety and allows for prompt intervention if seizures occur.

Choice D Reason:

Administering 3% saline as ordered is appropriate for treating severe hyponatremia in clients with SIADH. Hypertonic saline helps increase serum sodium levels, which is critical for correcting the electrolyte imbalance. This intervention should be closely monitored to avoid rapid changes in sodium levels.

Choice E Reason:

Encouraging fluid intake is not appropriate for clients with SIADH. The condition is characterized by excessive water retention, and increasing fluid intake can worsen hyponatremia. Instead, fluid restriction is typically recommended to manage the condition effectively.

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Naxlex Comprehensive Predictor Exams

The nurse administers amiodarone to a client with ventricular tachycardia. Which monitoring by the nurse is necessary with this drug? (Select all that apply)

Correct Answer is ["A","B","C","D"]

Explanation

The nurse is planning care for a client diagnosed with SIADH. Which of the following would be included in the plan of care? Select all that apply.

Correct Answer is ["B","C","D"]

Explanation

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The nurse is caring for a client immediately following a cardioversion. What nursing actions are appropriate? (Select all that apply.)

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What does the nurse recognize as clinical manifestations consistent with ascites? Select all that apply.

A postoperative client following a thyroidectomy suddenly develops difficulty breathing, stridor, and an increase in swelling of the anterior neck area. What should the nurse do first?

A nurse admits a client to the emergency department who reports nausea and vomiting that worsens when he lies down. Antacids do not help. The provider suspects acute pancreatitis. Which of the following laboratory test results should the nurse expect to see?

Which symptom will the nurse anticipate in a patient diagnosed with supraventricular tachycardia (SVT) with a non-sustained ventricular response?