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 ["B"]

Explanation

Choice A Reason:

I sleep at least 8 hours each night.

This statement is not concerning because getting adequate sleep is generally a sign of good health. It does not directly relate to symptoms of high blood glucose levels. Therefore, this choice is not relevant to the nurse’s concerns regarding the client’s elevated blood glucose level.

Choice B Reason:

I cannot seem to quench my thirst.

This statement is concerning because excessive thirst, known as polydipsia, is a common symptom of high blood glucose levels or hyperglycemia. When blood glucose levels are elevated, the body tries to eliminate the excess glucose through urine, leading to dehydration and increased thirst. This symptom indicates that the client’s blood glucose levels may be poorly controlled, which requires medical attention.

Choice C Reason:

I have to void nearly every hour.

Frequent urination, or polyuria, is another symptom of high blood glucose levels. When there is too much glucose in the blood, the kidneys work harder to filter and absorb it. When they can’t keep up, the excess glucose is excreted into the urine, pulling fluids from the tissues and causing frequent urination. This symptom is a clear indicator of hyperglycemia and needs to be addressed by the nurse.

Choice D Reason:

At times my vision is blurry.

Blurred vision can be a symptom of high blood glucose levels. Elevated glucose levels can cause the lens of the eye to swell, leading to changes in vision. This symptom is concerning because it suggests that the client’s blood glucose levels are affecting their vision, which can be a sign of poorly managed diabetes or other complications.

Choice E Reason:

I have lost 10 pounds without even trying.

Unintentional weight loss is a concerning symptom of high blood glucose levels. When the body cannot use glucose for energy due to insulin resistance or lack of insulin, it starts to break down muscle and fat for energy, leading to weight loss. This symptom indicates that the client’s diabetes may be uncontrolled, and immediate medical intervention is necessary.

A. Metabolic alkalosis B. Respiratory alkalosis C. Respiratory acidosis D. Metabolic acidosis

Correct Answer is D

Explanation

Choice A Reason:

Metabolic alkalosis is characterized by an elevated pH (greater than 7.45) and an increased bicarbonate (HCO3) level. In this case, the pH is 7.30, indicating acidosis, and the HCO3 level is 18 mEq/L, which is below the normal range (22-26 mEq/L). Therefore, metabolic alkalosis is not the correct diagnosis.

Choice B Reason:

Respiratory alkalosis is indicated by a high pH (greater than 7.45) and a low PaCO2 (less than 35 mm Hg). Although the PaCO2 is low at 28 mm Hg, the pH is 7.30, indicating acidosis rather than alkalosis. Therefore, respiratory alkalosis is not the correct diagnosis.

Choice C Reason:

Respiratory acidosis is characterized by a low pH (less than 7.35) and an elevated PaCO2 (greater than 45 mm Hg). In this case, the pH is low, indicating acidosis, but the PaCO2 is also low at 28 mm Hg, which does not fit the criteria for respiratory acidosis. Therefore, respiratory acidosis is not the correct diagnosis.

Choice D Reason:

Metabolic acidosis is indicated by a low pH (less than 7.35) and a low bicarbonate (HCO3) level (less than 22 mEq/L). In this case, the pH is 7.30, indicating acidosis, and the HCO3 level is 18 mEq/L, which is below the normal range. The low PaCO2 of 28 mm Hg suggests a compensatory respiratory response to the metabolic acidosis. Therefore, metabolic acidosis is the correct diagnosis.

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Nursing Test Bank

Naxlex Comprehensive Predictor Exams

During a routine medical evaluation, a client is found to have a random blood glucose level of 310 mg/dL. Which client statements are concerning to the nurse? Select all that apply.

Correct Answer is ["B"]

Explanation

A nurse is caring for a client who has the following arterial blood gas results: HCO3 18 mEq/L, PaCO2 28 mm Hg, and pH 7.30. The nurse recognizes the client is experiencing which of the following acid-base imbalances?

Correct Answer is D

Explanation

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