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","C","D","E","G"]

Explanation

Choice A Reason: Adherence to proper hand hygiene

Proper hand hygiene is a fundamental practice in preventing infections, including ventilator-associated pneumonia (VAP). Hand hygiene involves washing hands with soap and water or using an alcohol-based hand sanitizer before and after patient contact, after touching potentially contaminated surfaces, and before performing any aseptic procedures. This practice helps to reduce the transmission of pathogens that can cause infections in mechanically ventilated patients. Studies have shown that adherence to hand hygiene protocols significantly decreases the incidence of VAP and other healthcare-associated infections.

Choice B Reason: Suction the client at least every 2 hours

While suctioning is an important aspect of care for mechanically ventilated patients, routine suctioning every 2 hours is not recommended. Instead, suctioning should be performed based on the patient’s clinical condition and as needed. Over-suctioning can cause trauma to the airway and increase the risk of infection. Therefore, this choice is not included in the best practices for preventing VAP.

Choice C Reason: Administering antiulcer medication

Administering antiulcer medication is a recommended practice to prevent stress ulcers and gastrointestinal bleeding in mechanically ventilated patients. Stress ulcers can lead to complications such as aspiration of gastric contents, which can contribute to the development of VAP. Antiulcer medications, such as proton pump inhibitors or H2 receptor antagonists, help to reduce gastric acidity and the risk of ulcer formation. This practice is part of the comprehensive care plan to prevent VAP.

Choice D Reason: Providing oral care per protocol

Providing oral care per protocol is a critical component of VAP prevention. Oral care involves cleaning the patient’s mouth, teeth, and gums to reduce the colonization of harmful bacteria that can be aspirated into the lungs. Protocols for oral care typically include the use of antiseptic solutions, such as chlorhexidine, to disinfect the oral cavity. Regular oral care has been shown to significantly reduce the incidence of VAP in mechanically ventilated patients.

Choice E Reason: Elevating the head of the bed

Elevating the head of the bed to an angle of 30 to 45 degrees is a recommended practice to prevent VAP. This position helps to reduce the risk of aspiration of gastric contents into the lungs, which is a major risk factor for VAP. Elevating the head of the bed also promotes better lung expansion and ventilation, which can improve the patient’s respiratory status. This practice is widely recognized as an effective measure to prevent VAP.

Choice F Reason: Suctioning the client on a regular schedule

Similar to Choice B, routine suctioning on a regular schedule is not recommended. Suctioning should be performed based on the patient’s clinical needs and not on a fixed schedule. Over-suctioning can cause harm and increase the risk of infection. Therefore, this choice is not included in the best practices for preventing VAP.

Choice G Reason: Turning and positioning the client at least every 2 hours

Turning and positioning the client at least every 2 hours is an important practice to prevent complications such as pressure ulcers and to promote lung expansion. Regular repositioning helps to improve ventilation and drainage of secretions, reducing the risk of VAP. This practice is part of the standard care for mechanically ventilated patients to prevent various complications, including VAP.

A. Stretch marks B. Foul-smelling breath C. Increased abdominal girth D. Visible distended veins E. Rapid weight gain

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

Explanation

Choice A reason: Stretch marks, also known as striae, are not specific to ascites. They can occur due to rapid weight gain or loss, pregnancy, or other conditions that cause the skin to stretch. While they may be present in individuals with ascites due to rapid abdominal expansion, they are not a primary clinical manifestation of ascites.

Choice B reason: Foul-smelling breath, or halitosis, is not a typical symptom of ascites. It can be associated with various conditions, including poor oral hygiene, gastrointestinal disorders, or liver disease, but it is not a direct indicator of ascites.

Choice C reason: Increased abdominal girth is a primary clinical manifestation of ascites. Ascites is characterized by the accumulation of fluid in the peritoneal cavity, leading to noticeable abdominal distension. This symptom is often accompanied by a feeling of fullness or bloating.

Choice D reason: Visible distended veins, particularly around the abdomen, can be a sign of ascites. This occurs due to increased pressure in the abdominal veins as a result of fluid accumulation. The veins become more prominent and visible under the skin.

Choice E reason: Rapid weight gain is another key indicator of ascites. The accumulation of fluid in the abdomen leads to a significant increase in body weight over a short period. This rapid weight gain is often one of the first signs that prompts further investigation for ascites.

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Naxlex Comprehensive Predictor Exams

The nurse caring for mechanically ventilated clients uses best practices to prevent ventilator-associated pneumonia. What actions are included in this practice? (Select all that apply)

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

Explanation

What does the nurse recognize as clinical manifestations consistent with ascites? Select all that apply.

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

Explanation

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

Which symptom will the nurse anticipate in a patient diagnosed with supraventricular tachycardia (SVT) with a non-sustained ventricular response?

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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.

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.

A nurse suspects a client has diabetes insipidus. What are the priority interventions? 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?