NORCET 3 - 2022 (Shift-2)
Medical & Surgical Nursing
Medium
A patient is in shock. Which parameter will be used to assess different organ tissue perfusion?
Appeared in: NORCET 3 - 2022 (Shift-2)
Explanation
- Mean Arterial Pressure (MAP) is the average pressure in a patient's arteries during one cardiac cycle and is considered the most accurate single indicator of organ tissue perfusion.
- Shock is defined by inadequate end-organ perfusion, and MAP directly reflects the driving pressure for blood flow to these organs.
- Clinical guidelines for shock management, such as for sepsis, recommend maintaining a MAP of at least 65 mmHg to ensure adequate perfusion to the brain, heart, and kidneys.
- Unlike systolic blood pressure, which only reflects peak pressure, MAP provides a more stable and comprehensive measure of perfusion pressure over the entire cardiac cycle.
Why Other Options Were Wrong
- Option A: Systolic BP only measures the pressure during the heart's contraction (systole). It can remain deceptively normal in the early stages of shock while tissue perfusion is already compromised, making it a less reliable indicator of overall organ perfusion than MAP.
- Option C: Oxygen saturation (SpO2) measures oxygenation (how much oxygen is bound to hemoglobin), not perfusion (the flow of blood to tissues). A patient can have a normal SpO2 but be in severe shock with critically low blood flow.
- Option D: Temperature, especially core body temperature, is a non-specific sign. While cool, clammy skin can indicate peripheral vasoconstriction due to shock, core temperature is not a direct or reliable measure of vital organ perfusion and is influenced by many other factors like infection or environment.
Related Visual
Clinical Relevance
- Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Assessment of organ tissue perfusion in shock in acute care settings.
- In the ICU, nurses titrate vasopressor infusions (e.g., norepinephrine) based on the MAP to ensure vital organs are adequately perfused, especially in septic or cardiogenic shock.
- Accurate and frequent MAP monitoring, often via an invasive arterial line, is a critical nursing responsibility in unstable patients to guide resuscitation and prevent organ failure.
- A falling MAP is an early warning sign of decompensation, prompting nurses to reassess the patient, check fluid status, and alert the medical team for further intervention.
How to Approach the Question
- First, identify the key concepts in the question: 'shock' and 'organ tissue perfusion'. This tells you the question is about assessing blood flow to vital organs in a critical state.
- Next, analyze each option's physiological meaning. What does each parameter primarily measure?
- Systolic BP measures peak pressure during contraction.
- MAP measures average pressure throughout the cardiac cycle.
- Oxygen saturation measures how much oxygen is in the blood.
- Temperature measures body heat.
Concept Tested & Keywords
- Concept Tested: Assessment of organ tissue perfusion in shock.
- Stem keywords: shock, organ tissue perfusion, assess
- Lead-in keywords: Which parameter
Question ID
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Reference Book
E6 Medicine Harrison 22e Part 2 pp. 196-198, 216-218
E6 Medicine Davidson Principles Practice 24e p. 213-215
Practise the full NORCET 3 - 2022 (Shift-2)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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