DSSSB 6 September 2024
Medical Surgical Nursing
Easy
Which method is considered the most accurate for assessing the core body temperature in a critically ill patient?
Appeared in: DSSSB 6 September 2024
Explanation
- A pulmonary artery catheter (PAC) thermistor is considered the gold standard for core temperature measurement in critically ill patients.
- It measures the temperature of the blood directly within the central circulation (pulmonary artery), providing the most accurate and immediate reflection of core body temperature.
- This real-time data is essential for managing hemodynamically unstable patients, guiding therapies like targeted temperature management, and promptly detecting fever or hypothermia.
Why Other Options Were Wrong
- Option A: While a rectal probe measures a core temperature, it is known to lag behind rapid changes in central temperature, which can be critical in an unstable patient. Its accuracy can also be affected by the presence of stool or reduced blood flow to the rectum.
- Option C: The accuracy of tympanic sensors is highly dependent on the user's technique to get a proper seal in the ear canal. Readings can be easily distorted by factors like earwax (cerumen) or a middle ear infection (otitis media), making it unreliable for precise monitoring in the ICU.
- Option D: An oral thermometer measures sublingual temperature, not true core temperature. It is highly unreliable in critically ill patients who may be intubated, breathing through their mouth, receiving oxygen, or unable to keep their mouth closed.
Related Visual
Clinical Relevance
- Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Core body temperature assessment in critically ill patients in acute care settings.
- Accurate core temperature monitoring is vital in the ICU to promptly detect fever (a sign of infection/sepsis), monitor for hypothermia, and guide advanced therapies like targeted temperature management after cardiac arrest.
- Relying on less accurate peripheral methods in a critically ill patient can lead to delayed diagnosis, missed signs of deterioration, or inappropriate clinical interventions.
- What if? If a pulmonary artery catheter is not available or contraindicated, the next most accurate methods for continuous core monitoring in a critically ill patient would be an esophageal probe or a urinary bladder catheter with an integrated temperature sensor.
How to Approach the Question
- First, identify the keywords in the question: 'most accurate,' 'core body temperature,' and 'critically ill patient.'
- Recognize that 'critically ill' implies a need for the highest level of precision, often in an ICU setting where rapid changes must be detected.
- Evaluate each option based on its ability to measure the body's central or 'core' temperature, as opposed to a peripheral or surface temperature.
- Compare the core measurement sites. An oral thermometer measures surface temperature and is unreliable. Tympanic and rectal are core sites but have known limitations (user error, lag time).
- Conclude that measuring the temperature of the blood itself in a central vessel like the pulmonary artery is the most direct and therefore the most accurate method, making it the gold standard.
Concept Tested & Keywords
- Concept Tested: Core body temperature assessment in critically ill patients
- Stem keywords: most accurate, core body temperature, critically ill patient
- Lead-in keywords: Which method
- Negative lead-in flag: false
Question ID
QadXj0aF2HGBjK1qU8RY5I
Reference Book
E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 13-15
E6 Nursing Fundamentals Taylor p. 121-123
Practise the full DSSSB 6 September 2024
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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