Friday, 3 May 2013

Monitoring and Pulse oximetery


Monitoring:
The cardiac monitoring commonly known as continue monitoring of the heart activity. Generally it shows, Electrocardiography (Relatively cardiac rhythm, Heart rate etc), It can also measure the hemodynamically status of patient via pressure of blood flow within the circulatory system, and can record also the patient's temperature, respiration and pulse oximetery.

Electrocardiography:

Heart rate
Rhythm
Diagnostic values

Hemodynamically status:
Blood Pressure;

Systolic BP
Diastolic
Mean BP

Temperature:
Normal value is;
98.6 F
37 C

* It is usually measured by anal canal.

Respiration:
It is normally 12 to 20 breathes in Adult.
20 to 25 in Childrens.
25 to 40 in Infants.



Pulse Oximetery:
It is use to measure the oxygen saturation and the pulse rate in the peripheral circulation.



Work:
By a low intensity light beamed, from a light emitting diode (LED) to a light receiving photo-diode.
Two thin beam of light, one of them is; Red and other is; Infrared are transmitted through blood and body tissues, and  Some of portion of light is absorbed by blood and body tissue, a photo-diode measure the proportion of the light that passes through the blood and body tissues, that show the pulse oximetery on monitor.
The relatively light absorbed by oxygenated blood is differ from the deoxgenated blood.



Unreliable:
If patient have poor peripheral perfusion, by vasoconstiction, hypotension, BP cuff inflated by the sensor, hypothermia, other causes of poor blood flow the pulse oximetery not show the accurate results.

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