NORCET 1 - 2020
Medical & Surgical Nursing
Easy
The activity not recorded by a pulse oximeter?
Appeared in: NORCET 1 - 2020
Explanation
- ECG changes because a pulse oximeter is not designed to measure the electrical activity of the heart.
- A pulse oximeter functions using spectrophotometry, passing red and infrared light through a capillary bed to measure oxygen saturation and pulse rate.
- An electrocardiogram (ECG) is the specific tool required to record the heart's electrical signals, which are displayed as waveforms representing depolarization and repolarization of the heart muscle.
- Therefore, detecting or recording ECG changes is outside the technological capability of a pulse oximeter.
Why Other Options Were Wrong
- Option A: This is incorrect because a pulse oximeter directly measures and displays the pulse rate. It detects the pulsatile flow of arterial blood with each heartbeat.
- Option B: This is incorrect because the primary purpose of a pulse oximeter is to measure the oxygen level in the blood, specifically the percentage of hemoglobin saturated with oxygen.
- Option D: This is incorrect because SpO2% (peripheral oxygen saturation) is the specific parameter that a pulse oximeter is designed to measure and display. It is the most direct function of the device.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function and limitations of a pulse oximeter as background academic context rather than a clinical decision trigger.
- A nurse must understand the specific function of each monitoring device to interpret data correctly and avoid making clinical decisions based on misinterpreted information. Confusing a pulse oximeter with an ECG can lead to a failure to detect life-threatening arrhythmias.
- Patient safety depends on using the right tool for the right assessment. If a patient complains of chest pain or palpitations, a pulse oximeter reading is insufficient; an ECG is required to assess for cardiac ischemia or dysrhythmia.
- What if? If a patient has a normal SpO2 and pulse rate on the oximeter but is pale, diaphoretic, and complains of chest pain, the nurse's priority is to obtain an ECG immediately. The normal oximeter reading does not rule out a serious cardiac event like a myocardial infarction.
How to Approach the Question
- First, identify the core subject of the question, which is the function of a 'pulse oximeter'.
- Second, recall the primary measurements this device provides. A pulse oximeter measures oxygen saturation (SpO2) and pulse rate.
- Third, analyze the lead-in keyword 'not'. This means you are looking for the option that is outside the device's capability.
- Evaluate each option: 'Pulse' (yes, it measures this), 'Oxygen'/'SpO2%' (yes, it measures this), 'ECG changes' (no, this is electrical activity).
- The process of elimination clearly identifies 'ECG changes' as the parameter not recorded by a pulse oximeter.
Concept Tested & Keywords
- Concept Tested: Function and limitations of a pulse oximeter
- Stem keywords: pulse oximeter, not recorded
- Lead-in keywords: not
- Negative lead-in flag: The question asks to identify the parameter that is NOT measured by the device.
Question ID
QsSKpIY06XncdX6ERsQXbc
Reference Book
E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 23-25
E6 Medicine Davidson Principles Practice 24e p. 195-197
E6 Nursing Brunner Adult Health 3SA Vol 2 Part 1 p. 41-43
Practise the full NORCET 1 - 2020
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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