Photoplethysmogram
Photoplethysmogram
Photoplethysmogram (pronunciation: /ˌfoʊtoʊplɛθɪzmoʊˈɡræm/) is a non-invasive method used to detect blood volume changes in the microvascular bed of tissue. It is often used in wearable technologies to measure heart rate, blood pressure, and oxygen saturation.
Etymology
The term "Photoplethysmogram" is derived from the Greek words "photo" meaning light, "plethysmo" meaning increase, and "gram" meaning something written.
Method
A photoplethysmography device emits a light onto the skin and measures the light that is either transmitted through or reflected off the body. The changes in this light intensity are used to calculate blood volume changes, which can then be used to determine various physiological parameters.
Applications
Photoplethysmograms are used in a variety of medical and fitness applications. They are commonly used in pulse oximetry to measure oxygen saturation, in heart rate monitors to measure heart rate, and in blood pressure monitors to measure blood pressure. They are also used in sleep studies to monitor changes in blood volume during sleep.
Related Terms
- Photoplethysmography: The method of obtaining a photoplethysmogram.
- Pulse Oximetry: A test used to measure the oxygen level (oxygen saturation) of the blood.
- Heart Rate Monitor: A device used to continuously monitor the heart rate.
- Blood Pressure Monitor: A device used to measure blood pressure.
External links
- Medical encyclopedia article on Photoplethysmogram
- Wikipedia's article - Photoplethysmogram
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