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NurseDive Free Nursing Practice Question
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 (SaOâ‚‚) noninvasively. Which vital sign abnormality may alter pulse oximetry values?
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.
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.
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.
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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Full Explanation
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.
Similar Questions
A male client was admitted with a left-sided stroke this morning. The assistive personnel asks about meeting the client’s nutritional needs. Which response by the nurse is appropriate?
A. He is NPO until the speech-language pathologist performs a swallowing evaluation.
NPO until the speech-language pathologist performs a swallowing evaluation. This is the most appropriate response. NPO stands for “nil per os,” which means nothing by mouth. After a stroke, it is crucial to assess the patient’s ability to swallow safely to prevent aspiration, which can lead to pneumonia and other complications. A speech-language pathologist is trained to evaluate swallowing function and determine the safest diet for the patient. Until this evaluation is completed, the patient should not consume any food or liquids.
B. Be sure to sit him up when you are feeding him to make him feel more natural.
Be sure to sit him up when you are feeding him to make him feel more natural. While sitting the patient up during feeding is important to reduce the risk of aspiration, it is not sufficient on its own. Without a proper swallowing evaluation, feeding the patient could still pose significant risks. Therefore, this choice is not the most appropriate response.
C. You may give him a full-liquid diet, but please avoid solid foods until he gets stronger.
ay give him a full-liquid diet, but please avoid solid foods until he gets stronger. A full-liquid diet might seem like a safer option, but without a swallowing evaluation, there is still a risk of aspiration. The patient’s ability to handle even liquids needs to be assessed by a professional before any oral intake is allowed.
D. Just be sure to add some thickener in his liquids to prevent choking and aspiration.
Just be sure to add some thickener in his liquids to prevent choking and aspiration. Thickening liquids can help manage dysphagia, but this should only be done after a swallowing evaluation has determined the appropriate consistency. Administering thickened liquids without an evaluation could still result in aspiration if the patient has severe swallowing difficulties.
Full Explanation
Choice A: He is NPO until the speech-language pathologist performs a swallowing evaluation.
This is the most appropriate response. NPO stands for “nil per os,” which means nothing by mouth. After a stroke, it is crucial to assess the patient’s ability to swallow safely to prevent aspiration, which can lead to pneumonia and other complications. A speech-language pathologist is trained to evaluate swallowing function and determine the safest diet for the patient. Until this evaluation is completed, the patient should not consume any food or liquids.
Choice B: Be sure to sit him up when you are feeding him to make him feel more natural.
While sitting the patient up during feeding is important to reduce the risk of aspiration, it is not sufficient on its own. Without a proper swallowing evaluation, feeding the patient could still pose significant risks. Therefore, this choice is not the most appropriate response.
Choice C: You may give him a full-liquid diet, but please avoid solid foods until he gets stronger.
A full-liquid diet might seem like a safer option, but without a swallowing evaluation, there is still a risk of aspiration. The patient’s ability to handle even liquids needs to be assessed by a professional before any oral intake is allowed.
Choice D: Just be sure to add some thickener in his liquids to prevent choking and aspiration.
Thickening liquids can help manage dysphagia, but this should only be done after a swallowing evaluation has determined the appropriate consistency. Administering thickened liquids without an evaluation could still result in aspiration if the patient has severe swallowing difficulties.
A nurse suspects a client has diabetes insipidus. What are the priority interventions? Select all that apply.
A. Monitor for hypernatremia.
Hypernatremia, or high sodium levels in the blood, is a common complication of diabetes insipidus due to excessive water loss and insufficient water intake. Monitoring for hypernatremia involves regular blood tests to check sodium levels. Symptoms of hypernatremia include extreme thirst, confusion, muscle twitching, and seizures. Early detection and management are crucial to prevent severe complications.
B. Monitor neuro status.
Monitoring neurological status is essential in patients with diabetes insipidus because severe hypernatremia can lead to neurological symptoms such as confusion, irritability, seizures, and even coma. Regular assessments of mental status, level of consciousness, and neurological function help in early detection of complications and timely intervention.
C. Monitor for hyponatremia.
While hyponatremia (low sodium levels) is less common in diabetes insipidus, it can occur if there is excessive water intake without adequate sodium replacement. Symptoms include headache, nausea, vomiting, confusion, and seizures. Monitoring sodium levels helps in maintaining a balance and preventing complications.
D. Monitor urine specific gravity.
Urine specific gravity measures the concentration of solutes in the urine. In diabetes insipidus, urine is typically very dilute, with a specific gravity of less than 1.005. Regular monitoring helps in assessing the effectiveness of treatment and the patient’s hydration status. It also aids in differentiating diabetes insipidus from other conditions with similar symptoms.
E. Monitor strict I&O.
Strict monitoring of intake and output (I&O) is crucial in managing diabetes insipidus. This involves accurately measuring all fluids consumed and excreted to ensure proper hydration and electrolyte balance. It helps in identifying trends in fluid loss and guiding appropriate fluid replacement therapy.
Full Explanation
Choice A: Monitor for hypernatremia.
Hypernatremia, or high sodium levels in the blood, is a common complication of diabetes insipidus due to excessive water loss and insufficient water intake. Monitoring for hypernatremia involves regular blood tests to check sodium levels. Symptoms of hypernatremia include extreme thirst, confusion, muscle twitching, and seizures. Early detection and management are crucial to prevent severe complications.
Choice B: Monitor neuro status.
Monitoring neurological status is essential in patients with diabetes insipidus because severe hypernatremia can lead to neurological symptoms such as confusion, irritability, seizures, and even coma. Regular assessments of mental status, level of consciousness, and neurological function help in early detection of complications and timely intervention.
Choice C: Monitor for hyponatremia.
While hyponatremia (low sodium levels) is less common in diabetes insipidus, it can occur if there is excessive water intake without adequate sodium replacement. Symptoms include headache, nausea, vomiting, confusion, and seizures. Monitoring sodium levels helps in maintaining a balance and preventing complications.
Choice D: Monitor urine specific gravity.
Urine specific gravity measures the concentration of solutes in the urine. In diabetes insipidus, urine is typically very dilute, with a specific gravity of less than 1.005. Regular monitoring helps in assessing the effectiveness of treatment and the patient’s hydration status. It also aids in differentiating diabetes insipidus from other conditions with similar symptoms.
Choice E: Monitor strict I&O.
Strict monitoring of intake and output (I&O) is crucial in managing diabetes insipidus. This involves accurately measuring all fluids consumed and excreted to ensure proper hydration and electrolyte balance. It helps in identifying trends in fluid loss and guiding appropriate fluid replacement therapy.
The nurse is caring for a client with an ileostomy because of inflammatory bowel disease. Which assessment findings indicate to the nurse that the ileostomy is functioning as expected? Select all that apply.
A. Formed stool in collection pouch.
Formed stool in the collection pouch is not expected in an ileostomy. The output from an ileostomy is typically liquid to semi-liquid because the ileum does not absorb as much water as the colon. If formed stool is present, it may indicate a blockage or other issue that needs to be addressed.
B. Stoma is edematous and bleeding.
An edematous and bleeding stoma is not a normal finding and may indicate complications such as infection, trauma, or poor stoma care. The stoma should be moist and pink, but not swollen or bleeding. Persistent bleeding or significant edema should be reported to a healthcare provider immediately.
C. Stoma is pink and shiny.
A pink and shiny stoma is a sign that the ileostomy is functioning well. This indicates good blood flow and healthy tissue. The stoma should always appear moist and pink, similar to the inside of the mouth. Any deviation from this appearance, such as a pale, dark, or dry stoma, should be evaluated by a healthcare professional.
D. Skin excoriation around the stoma.
Skin excoriation around the stoma is not a normal finding and suggests that the skin is being irritated by the stoma output or the ostomy appliance. Proper skin care and fitting of the ostomy appliance are essential to prevent skin breakdown. If excoriation occurs, it should be treated promptly to prevent further complications.
E. Mucus liquid flows from the stoma.
Mucus liquid flowing from the stoma is expected in an ileostomy. The output is typically liquid to semi-liquid and may contain mucus, which is normal for the small intestine. This type of output indicates that the ileostomy is functioning as intended.
Full Explanation
Choice A: Formed stool in collection pouch
Formed stool in the collection pouch is not expected in an ileostomy. The output from an ileostomy is typically liquid to semi-liquid because the ileum does not absorb as much water as the colon. If formed stool is present, it may indicate a blockage or other issue that needs to be addressed.
Choice B: Stoma is edematous and bleeding
An edematous and bleeding stoma is not a normal finding and may indicate complications such as infection, trauma, or poor stoma care. The stoma should be moist and pink, but not swollen or bleeding. Persistent bleeding or significant edema should be reported to a healthcare provider immediately.
Choice C: Stoma is pink and shiny
A pink and shiny stoma is a sign that the ileostomy is functioning well. This indicates good blood flow and healthy tissue. The stoma should always appear moist and pink, similar to the inside of the mouth. Any deviation from this appearance, such as a pale, dark, or dry stoma, should be evaluated by a healthcare professional.
Choice D: Skin excoriation around the stoma
Skin excoriation around the stoma is not a normal finding and suggests that the skin is being irritated by the stoma output or the ostomy appliance. Proper skin care and fitting of the ostomy appliance are essential to prevent skin breakdown. If excoriation occurs, it should be treated promptly to prevent further complications.
Choice E: Mucus liquid flows from the stoma
Mucus liquid flowing from the stoma is expected in an ileostomy. The output is typically liquid to semi-liquid and may contain mucus, which is normal for the small intestine. This type of output indicates that the ileostomy is functioning as intended.