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:

A 42-year-old man with gastroesophageal reflux disease (GERD) is not at the highest risk for obstructive sleep apnea (OSA). While GERD can be associated with OSA, it is not a primary risk factor. The main risk factors for OSA include obesity, age, and anatomical features that can obstruct the airway. Therefore, this individual is not at the greatest risk compared to others.

Choice B Reason:

A 55-year-old woman who is 50 lb (23 kg) overweight is at significant risk for developing OSA. Obesity is one of the most critical risk factors for OSA because excess weight can lead to fat deposits around the upper airway, which can obstruct breathing during sleep. Additionally, being overweight increases the likelihood of other conditions that can exacerbate OSA, such as hypertension and metabolic syndrome.

Choice C Reason:

A 20-year-old woman who is 8 months pregnant may experience temporary sleep disturbances, including snoring and mild sleep apnea, due to hormonal changes and increased abdominal pressure. However, pregnancy-related sleep apnea is usually transient and resolves after childbirth. Therefore, while she may have an increased risk during pregnancy, it is not as significant as the risk posed by obesity.

Choice D Reason:

A 73-year-old man with type 2 diabetes mellitus has an increased risk of OSA, as diabetes is associated with obesity and metabolic syndrome, which are risk factors for OSA. However, the presence of diabetes alone does not pose as high a risk as obesity. Therefore, while this individual is at risk, it is not as high as the risk associated with being significantly overweight.

A. Weight loss. B. Intolerance to cold. C. An elevated systolic blood pressure. D. A heart rate of 90 bpm. E. Increased fatigability.

Correct Answer is ["A","C","E"]

Explanation

Choice A Reason:

Weight loss.

Weight loss is a common symptom of hyperthyroidism. This condition speeds up the body’s metabolism, causing the body to burn calories more quickly than usual. Despite an increased appetite, individuals with hyperthyroidism often experience significant weight loss. This symptom is a direct result of the overproduction of thyroid hormones, which increases the metabolic rate.

Choice B Reason:

Intolerance to cold.

Intolerance to cold is not typically associated with hyperthyroidism; it is more commonly a symptom of hypothyroidism. Hyperthyroidism usually causes heat intolerance due to the increased metabolic rate, which raises the body’s temperature. Therefore, this choice is not relevant to hyperthyroidism.

Choice C Reason:

An elevated systolic blood pressure.

An elevated systolic blood pressure can be a symptom of hyperthyroidism. The increased levels of thyroid hormones can cause the heart to work harder, leading to higher blood pressure. This symptom is important to monitor as it can lead to further cardiovascular complications if left untreated.

Choice D Reason:

A heart rate of 90 bpm.

A heart rate of 90 bpm is within the normal range for adults and is not specifically indicative of hyperthyroidism. Hyperthyroidism typically causes a rapid or irregular heartbeat, often exceeding 100 bpm. Therefore, this choice does not accurately reflect a clinical manifestation of hyperthyroidism.

Choice E Reason:

Increased fatigability.

Increased fatigability is a common symptom of hyperthyroidism. Despite the increased metabolic rate, individuals with hyperthyroidism often feel tired and weak. This paradoxical symptom occurs because the body’s systems are overworked and cannot sustain the heightened activity levels, leading to fatigue.

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Naxlex Comprehensive Predictor Exams

A nurse assesses clients on the medical-surgical unit. Which client is at greatest risk for development of obstructive sleep apnea?

Correct Answer is B

Explanation

What clinical manifestations does the nurse recognize would be associated with a diagnosis of hyperthyroidism? Select all that apply.

Correct Answer is ["A","C","E"]

Explanation

A nurse in a PACU is assessing a client who has a newly created colostomy. Which of the following findings should the nurse report to the provider?

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The nurse is preparing to administer medication using a client’s nasogastric tube. Which actions should the nurse take before administering the medication? Select all that apply.

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