NEET MDS

The Power Course

Choose the best method to measure the oxygen saturation of the pulp:



Choices

1 ) Laser Doppler Flowmetry
2 ) Pulse Oximetry
3 ) Electric Pulp Test
4 ) Endo Ice

Explanation


Pulse Oximetry:

It is a non-invasive method to measure the oxygen saturation levels of patients' hemoglobin in the arterial blood. This is used during the administration of anesthesia or other medical conditions including intensive care with the help of finger, ear or foot probes. The device which is used for this purpose is known as a pulse oximeter also this device displays heart rate. 

Principle:

It uses spectrophotometry based on Beer - lambert law. 

Beers law:

The intensity of the transmitted light decreases exponentially with the concentration of the substance.

Lambert's law:

The intensity of the transmitted light decreases exponentially with the distance it travels. 

Pulse oximeter differentiates the oxy and deoxyhemoglobin by the difference in the absorption of red light with 660 nm and the infrared light of 940 nm by giving the pulsatile changes in the amount of red and infrared light absorbed by the vascular bed before reaching the photodetector. The photodetector detects the amount of each color absorbed by the arterial blood and transmits this data to the monitor which displays the values with each heartbeat. 

Blood with a good amount of oxygen absorbs the infrared light and allows it to pass. 

Normal values:

Oxygen saturation levels ranging from 95 to 99% in a healthy person. 

Types of pulse oximeter Device:

1. Finger or Hand type

2. Desktop-type

Components of pulse oximeter equipment:

It consists of:

1. Pulse Oximeter Monitor (POM)

2. Pulse Oximeter Sensor (POS)

3. Sensor holder

3. Audible pulse tone

Note:

The pulse oximeter can be used as a vital instrument for measuring the vital and necrotic (non-vital) pulp. 


Answer

Pulse Oximetry

Last Modified : 05-Jan-2020

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