Pulse oximeter is used to measure?

GMCH Chandigarh - 2022

Nursing Foundation

Easy

Appeared in: GMCH Chandigarh - 2022

Explanation

A pulse oximeter is a non-invasive medical device used for monitoring two key vital signs simultaneously.
Its primary function is to measure the peripheral oxygen saturation (SpO₂) of arterial blood, which estimates the amount of oxygen being carried by hemoglobin.
Concurrently, it measures the patient's pulse rate (heart rate) in beats per minute (bpm) by detecting the pulsatile flow of blood.
Therefore, the most comprehensive and accurate description of its function is that it measures both oxygen saturation and pulse rate.

Option A: This option is incomplete. While measuring oxygen saturation is a primary function of a pulse oximeter, it is not the only function.
Option B: This option is incomplete. The 'oxi' part of 'oximeter' refers to oxygen. The device's main purpose is to measure oxygenation, although it also provides the pulse rate.
Option D: This option is incorrect because the pulse oximeter is specifically designed to measure the parameters listed in options A and B.

Visual 1: Diagram - An illustration showing a pulse oximeter probe on a finger, with arrows indicating the emission of red and infrared light through the nail bed to a photodetector. This helps visualize the working principle.
Visual 2: Infographic - A chart displaying different SpO₂ percentage ranges (e.g., >95% Normal, 91-94% Mild Hypoxemia, <90% Severe Hypoxemia) and their clinical implications. This helps in interpreting the readings.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of a Pulse Oximeter as background academic context rather than a clinical decision trigger.
Nurses rely on pulse oximetry for rapid, continuous, and non-invasive monitoring of a patient's oxygenation status. It is a fundamental component of vital signs assessment, crucial for early detection of hypoxemia.
The readings guide clinical decisions, such as the need to start, adjust, or wean supplemental oxygen therapy, and help assess a patient's response to respiratory interventions.
What if? If a patient has dark nail polish or artificial nails, the pulse oximeter reading may be falsely low. The nurse's first action should be to remove the polish/nail. If that's not possible, an alternative site like an earlobe, toe (if no polish), or forehead sensor should be used to obtain an accurate reading.

How to Approach the Question

First, analyze the name of the device: 'Pulse Oximeter'. Break it down into its components: 'Pulse' and 'Oxi' (referring to oxygen).
This breakdown strongly suggests the device measures both pulse and something related to oxygen.
Recall the standard use of this device in clinical settings. It is routinely used to check both heart rate and oxygen levels.
Evaluate the given options. Option A ('Oxygen saturation') and Option B ('Pulse rate') are both correct functions, but they are incomplete on their own.
Look for an option that combines these functions. Option C ('Both a and b') is the most comprehensive and accurate answer.
Eliminate Option D ('None of these') as the device clearly performs the functions mentioned.

Concept Tested & Keywords

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