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.

Nursing Test Bank

Test Bank #1: RN Pharmacology Exams Test Bank #2: RN Medical-Surgical Exams Test Bank #3: RN Fundamentals Exams Test Bank #4: RN Maternal-Newborn Exams Test Bank #5: RN Anatomy and Physiology Exams Test Bank #6: RN Obstetrics and Pediatrics Exams Test Bank #7: RN Fluid and Electrolytes Exams Test Bank #9: RN Adult Health Test Bank #10: RN Dosage Calculation Test Bank #11: RN Community Health Exams Test Bank #12: RN Psychology Exams Test Bank #13: RN Nursing Care Of Children Test Bank #14: RN Foundations of Nursing Exams

Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Exam #1: RN Comprehensive predictor 2023 proctored exam Exam #2: Ati rn vati comprehensive predictor proctored exam Exam #3: Ati Rn Comprehensive Predictor Proctored Exam 2023 Exam #4: Rn Comprehensive Predictor 2023 Proctored Exam - St. Joseph Exam #5: RN Comprehensive Predictor Proctored Exam (National U CA San Diego) Exam #6: Ati rn comprehensive predictor 2023 retake proctored exam Exam #7: RN Hesi Exit Proctored Exam Exam #8: Hesi RN Exit proctored exam Exam #9: Hesi rn exit proctored exam Exam #10: Hesi Rn compass exit B proctored exam

Free Nursing Study Resources

Correct Answer is A

Explanation

Choice A Reason:

Hemoptysis, or coughing up blood, is a common feature of both mitral valve stenosis and mitral valve regurgitation. In mitral valve stenosis, the narrowing of the valve leads to increased pressure in the pulmonary veins, which can cause pulmonary congestion and hemoptysis. Similarly, in mitral valve regurgitation, the backflow of blood into the left atrium increases pulmonary pressure, potentially leading to pulmonary edema and hemoptysis. Therefore, hemoptysis is a shared symptom of both conditions.

Choice B Reason:

A high-pitched holosystolic murmur is more commonly associated with mitral valve regurgitation rather than mitral valve stenosis. In mitral valve regurgitation, the murmur is caused by the backflow of blood from the left ventricle into the left atrium during systole3. Mitral valve stenosis, on the other hand, typically presents with a diastolic murmur due to the turbulent flow of blood through the narrowed valve during diastole. Therefore, a high-pitched holosystolic murmur is not a common feature of both disorders.

Choice C Reason:

Hepatomegaly, or an enlarged liver, can occur in advanced cases of both mitral valve stenosis and mitral valve regurgitation due to right-sided heart failure. However, it is not a primary or common feature of these conditions. Hepatomegaly is more often associated with conditions that directly affect the right side of the heart or cause systemic congestion. Therefore, hepatomegaly is not a common feature of both mitral valve stenosis and mitral valve regurgitation.

A. Weigh the client daily. B. Restrict food intake. C. Administer oral corticosteroids. D. Provide a low carbohydrate diet.

Correct Answer is C

Explanation

Choice A Reason:

Weigh the client daily: While monitoring weight is important for clients with Addison’s disease, it is not the primary action to prevent an Addisonian crisis. Daily weight monitoring helps track fluid balance and detect any sudden changes that might indicate complications, but it does not directly address the hormonal imbalance that characterizes Addisonian crisis.

Choice B Reason:

Restrict food intake: Restricting food intake is not recommended for clients with Addison’s disease. Proper nutrition is crucial for maintaining energy levels and overall health. Clients with Addison’s disease need a balanced diet to manage their condition effectively. Restricting food intake could lead to malnutrition and exacerbate symptoms.

Choice C Reason:

Administer oral corticosteroids: This is the correct action. Addison’s disease is characterized by insufficient production of cortisol and aldosterone by the adrenal glands. Administering oral corticosteroids helps replace the deficient hormones and manage the symptoms of Addison’s disease. During an Addisonian crisis, immediate administration of corticosteroids is critical to prevent severe complications such as shock, coma, or even death.

Choice D Reason:

Provide a low carbohydrate diet: A low carbohydrate diet is not specifically recommended for clients with Addison’s disease. Instead, a balanced diet that includes adequate carbohydrates, proteins, and fats is essential. Carbohydrates are important for maintaining energy levels, especially since clients with Addison’s disease may experience fatigue and weakness. Restricting carbohydrates could lead to low blood sugar levels, which can be dangerous for these clients.

View Question and Answer

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

After teaching a nursing student about mitral valve stenosis and mitral valve regurgitation, the nurse identifies effective learning when the student identifies which common feature of both disorders?

Correct Answer is A

Explanation

A nurse is caring for a client who has Addison’s disease and is at risk for Addisonian crisis. Which of the following actions should the nurse take?

Correct Answer is C

Explanation

A nurse is providing teaching for a client who has a new diagnosis of gastroesophageal reflux disease (GERD). The client asks about foods he should avoid eating. Which of the following foods should the nurse tell him to avoid?

A client with a history of seizures is scheduled for an electroencephalogram (EEG). Which instruction does the nurse give the client before the test?

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.

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 caring for a client who had a hemorrhagic stroke. Which assessment finding is the earliest sign of increasing intracranial pressure (ICP) for this client?

A nurse is caring for a client who has hypernatremia and requires IV fluid therapy due to his NPO status. Which of the following solutions should the nurse prepare to infuse for this client?

The nurse is caring for a client with a heart rate of 143 beats/min with atrial fibrillation. Which assessment data will the nurse anticipate? Select all that apply:

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?