Pneumograph
Pneumograph
Pneumograph (pronounced: /ˈnjuːməʊɡrɑːf/), also known as a respiratory transducer, is a device used to measure the movement of the chest and abdomen during breathing. The term is derived from the Greek words 'pneuma' meaning 'breath' and 'graph' meaning 'writing'.
History
The pneumograph was first developed in the late 19th century as a tool for studying respiration. The early versions of the device were mechanical in nature, using bellows or other types of air-filled chambers to measure the expansion and contraction of the chest and abdomen.
Function
A pneumograph works by detecting changes in air pressure caused by the movement of the chest and abdomen. These changes are then converted into electrical signals, which can be recorded and analyzed. The data collected by a pneumograph can be used to diagnose respiratory disorders, monitor a patient's breathing during surgery, or study the effects of various treatments on respiration.
Types of Pneumographs
There are several types of pneumographs, including:
- Impedance Pneumograph: This type of pneumograph uses electrodes placed on the chest and abdomen to measure changes in electrical impedance caused by breathing.
- Inductive Pneumograph: This type of pneumograph uses coils of wire placed around the chest and abdomen to measure changes in inductance caused by breathing.
- Optical Pneumograph: This type of pneumograph uses light sensors to measure changes in the amount of light reflected by the chest and abdomen during breathing.
Related Terms
- Respiration: The process of inhaling and exhaling air in order to exchange oxygen and carbon dioxide between the lungs and the atmosphere.
- Spirometer: A device used to measure the volume of air inhaled and exhaled by the lungs.
- Plethysmograph: A device used to measure changes in volume within an organ or whole body, often used in conjunction with a pneumograph to provide more comprehensive data on respiration.
- Respiratory Disorders: Medical conditions that affect the respiratory system, including asthma, chronic obstructive pulmonary disease (COPD), and sleep apnea.
External links
- Medical encyclopedia article on Pneumograph
- Wikipedia's article - Pneumograph
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