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 D

Explanation

Choice A Reason:

A pulse of 86 beats per minute is within the normal range for adults (60-100 beats per minute) and does not typically indicate a postoperative complication. While it is important to monitor vital signs, this pulse rate alone is not concerning unless accompanied by other abnormal findings.

Choice B Reason:

Hypoactive bowel sounds in all four quadrants can occur after surgery due to the effects of anesthesia and the surgical procedure itself. While it is important to monitor bowel sounds, hypoactivity is not immediately concerning unless it persists or is accompanied by other symptoms such as abdominal pain or distention. Therefore, this finding alone does not indicate an evolving complication.

Choice C Reason:

A blood pressure of 110/70 mm Hg is within the normal range for adults and does not typically indicate a postoperative complication. Blood pressure should be monitored regularly, but this reading alone is not concerning unless there are significant changes or other abnormal findings.

Choice D Reason:

Increasing restlessness is a concerning sign in the immediate postoperative period. It can indicate several potential complications, including pain, hypoxia, or the onset of delirium. Restlessness may also be an early sign of shock or other serious conditions that require prompt intervention. Therefore, this symptom warrants further assessment and immediate attention to determine the underlying cause and provide appropriate treatment.

A. Pronation of the hands. B. Extension of the arms. C. External rotation of the lower extremities. D. Plantar flexion of the legs.

Correct Answer is D

Explanation

Choice A Reason:

Pronation of the hands.

Pronation of the hands is not typically associated with decorticate posturing. Decorticate posturing is characterized by the flexion of the arms and wrists, with the hands often clenched into fists. Pronation refers to the rotation of the hands so that the palms face downward, which is not a feature of decorticate posturing.

Choice B Reason:

Extension of the arms.

Extension of the arms is more characteristic of decerebrate posturing, not decorticate posturing. In decorticate posturing, the arms are flexed and held tightly to the chest, not extended. This flexion is due to damage to the cerebral hemispheres, which affects the corticospinal tract.

Choice C Reason:

External rotation of the lower extremities.

External rotation of the lower extremities is not a typical finding in decorticate posturing. In decorticate posturing, the legs are usually extended and rigid, with the toes pointed. External rotation would indicate a different type of posturing or neurological condition.

Choice D Reason:

Plantar flexion of the legs.

Plantar flexion of the legs is a characteristic finding in decorticate posturing. This involves the toes pointing downward, which is a result of the increased muscle tone and reflexes due to the brain injury. This posture indicates severe damage to the brain, specifically the corticospinal tract.

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Nursing Test Bank

Naxlex Comprehensive Predictor Exams

The nurse is monitoring the status of a postoperative client in the immediate postoperative period. The nurse would become most concerned with which sign that could indicate an evolving complication?

Correct Answer is D

Explanation

An acute care nurse receives a shift report for a client who has increased intracranial pressure. The nurse is told that the client demonstrates decorticate posturing. Which of the following findings should the nurse expect to observe when assessing the client?

Correct Answer is D

Explanation

A new nurse is having a difficult time identifying which client should be seen first because they all seem important. The nurse preceptor helps and explains that the client with which of the following should be seen first?

A client with Parkinson’s disease (PD) is being discharged home with his wife. To ensure success with the management plan, which discharge action is most effective?

The nurse is caring for a client recovering from an esophagogastroduodenoscopy (EGD). Which of the following client symptoms would require further nursing assessment?

A client has been admitted with new-onset status epilepticus. Which seizure precautions would the nurse implement? (Select all that apply.)

A client is on intravenous heparin to treat DVT in the right leg. The client’s most recent partial thromboplastin time (PTT) was 25 seconds. What order would the nurse anticipate?

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)

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

The nurse is planning health teaching for a client starting on donepezil for Alzheimer’s disease (AD). For which side effect will the nurse teach the family to monitor?