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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Correct Answer is ["A"]

Explanation

Choice A: Monitor for hypernatremia.

Hypernatremia, or high sodium levels in the blood, is a common complication of diabetes insipidus due to excessive water loss and insufficient water intake. Monitoring for hypernatremia involves regular blood tests to check sodium levels. Symptoms of hypernatremia include extreme thirst, confusion, muscle twitching, and seizures. Early detection and management are crucial to prevent severe complications.

Choice B: Monitor neuro status.

Monitoring neurological status is essential in patients with diabetes insipidus because severe hypernatremia can lead to neurological symptoms such as confusion, irritability, seizures, and even coma. Regular assessments of mental status, level of consciousness, and neurological function help in early detection of complications and timely intervention.

Choice C: Monitor for hyponatremia.

While hyponatremia (low sodium levels) is less common in diabetes insipidus, it can occur if there is excessive water intake without adequate sodium replacement. Symptoms include headache, nausea, vomiting, confusion, and seizures. Monitoring sodium levels helps in maintaining a balance and preventing complications.

Choice D: Monitor urine specific gravity.

Urine specific gravity measures the concentration of solutes in the urine. In diabetes insipidus, urine is typically very dilute, with a specific gravity of less than 1.005. Regular monitoring helps in assessing the effectiveness of treatment and the patient’s hydration status. It also aids in differentiating diabetes insipidus from other conditions with similar symptoms.

Choice E: Monitor strict I&O.

Strict monitoring of intake and output (I&O) is crucial in managing diabetes insipidus. This involves accurately measuring all fluids consumed and excreted to ensure proper hydration and electrolyte balance. It helps in identifying trends in fluid loss and guiding appropriate fluid replacement therapy.

A. Nonfat milk B. Apple C. Chocolate

Correct Answer is C

Explanation

Choice A Reason:

Nonfat milk is generally considered safe for individuals with GERD. While full-fat dairy products can exacerbate GERD symptoms due to their high-fat content, nonfat milk does not have this effect. It is low in fat and unlikely to trigger acid reflux. Therefore, nonfat milk is not a food that needs to be avoided by someone with GERD.

Choice B Reason:

Apples are typically safe for individuals with GERD. In fact, non-citrus fruits like apples are often recommended as part of a GERD-friendly diet. They are low in acid and unlikely to cause reflux symptoms. Therefore, apples do not need to be avoided by someone with GERD.

Choice C Reason:

Chocolate is a common trigger for GERD symptoms. It contains caffeine and theobromine, both of which can relax the lower esophageal sphincter (LES), allowing stomach acid to escape into the esophagus and cause reflux. Additionally, chocolate is high in fat, which can further exacerbate GERD symptoms. Therefore, it is advisable for individuals with GERD to avoid chocolate to prevent worsening of their symptoms.

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Naxlex Comprehensive Predictor Exams

A nurse suspects a client has diabetes insipidus. What are the priority interventions? Select all that apply.

Correct Answer is ["A"]

Explanation

A nurse is providing teaching for a client who has a new diagnosis of gastroesophageal reflux disease (GERD). The client asks about foods he should avoid eating. Which of the following foods should the nurse tell him to avoid?

Correct Answer is C

Explanation

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A nurse is providing teaching to a client who has diabetes mellitus about carbohydrate intake needs when exercising. Which of the following foods should the nurse include as containing a 15 g serving of carbohydrates?

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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.

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