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"]

Explanation

Choice A reason: A 22-year-old client with asthma is considered a priority for pneumonia vaccination. Asthma is a chronic respiratory condition that can increase the risk of complications from pneumonia. Vaccination helps protect against pneumococcal infections, which can be particularly severe in individuals with underlying respiratory conditions.

Choice B reason: A healthy 72-year-old client is also a priority for pneumonia vaccination. The Centers for Disease Control and Prevention (CDC) recommends pneumococcal vaccination for all adults aged 65 years and older. Older adults are at higher risk for pneumococcal disease due to age-related decline in immune function.

Choice C reason: A client with well-controlled diabetes should be prioritized for pneumonia vaccination. Diabetes can weaken the immune system, making individuals more susceptible to infections, including pneumonia. Vaccination is an important preventive measure for individuals with chronic health conditions.

Choice D reason: A client who is taking medication for hypertension is not necessarily a priority for pneumonia vaccination based solely on their hypertension. While hypertension is a common condition, it does not directly increase the risk of pneumococcal disease. However, if the client has other risk factors or comorbidities, they may still be considered for vaccination.

Choice E reason: A client who had a cholecystectomy last year is not a priority for pneumonia vaccination based on this surgical history alone. A cholecystectomy, which is the removal of the gallbladder, does not increase the risk of pneumococcal disease. Priority for vaccination is typically given to individuals with chronic health conditions, older adults, and those with weakened immune systems.

A. Increase in the temperature from 37.5°C (99.5°F) to 38.6°C (101.5°F) B. Decrease in the urinary output from 50 to 30 mL per hour C. Increase in the heart rate from 88 to 110/min D. Decrease in the respiratory rate from 20 to 16/min

Correct Answer is B

Explanation

Choice A reason: An increase in temperature is not a primary indicator of hypovolemic shock. While fever can occur due to infection or inflammation, it is not directly related to hypovolemic shock, which is primarily characterized by a significant loss of blood or fluids leading to decreased perfusion and oxygenation of tissues.

Choice B reason: A decrease in urinary output is a critical sign of hypovolemic shock. When the body loses a significant amount of blood or fluids, the kidneys receive less blood flow, leading to reduced urine production. This is a compensatory mechanism to conserve fluids and maintain blood pressure. Normal urine output is typically around 30 to 50 mL per hour, so a drop below this range is concerning.

Choice C reason: An increase in heart rate is a common response to hypovolemic shock as the body attempts to maintain cardiac output and blood pressure despite the loss of blood volume. Tachycardia (increased heart rate) is one of the early signs of shock, indicating that the heart is working harder to pump blood to vital organs.

Choice D reason: A decrease in respiratory rate is not typical of hypovolemic shock. In fact, hypovolemic shock often leads to an increased respiratory rate (tachypnea) as the body tries to compensate for decreased oxygen delivery to tissues. A decrease in respiratory rate could indicate other issues but is not a hallmark of hypovolemic shock.

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Naxlex Comprehensive Predictor Exams

A nurse is providing pneumonia vaccinations in a community setting. Due to limited finances, the event organizers must limit giving the vaccination to priority groups. What clients would be considered a priority when administering the pneumonia vaccination? (Select all that apply)

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

Explanation

A nurse is caring for a client who returns to the nursing unit from the recovery room after a sigmoid colon resection for adenocarcinoma. The client had an episode of intraoperative bleeding. Which finding indicates to the nurse that the client may be developing hypovolemic shock?

Correct Answer is B

Explanation

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