Colorimetric capnography
Colorimetric Capnography
Colorimetric capnography (pronunciation: kuh-luh-rim-uh-trik kap-nog-ruh-fee) is a method used to determine the concentration of carbon dioxide (CO2) in exhaled breath. This technique is commonly used in medical settings, particularly in anesthesia and critical care.
Etymology
The term "colorimetric capnography" is derived from three words: "colorimetric", "capno", and "graphy". "Colorimetric" is derived from the word "colorimetry", which is a technique used to determine the concentration of colored compounds in solutions. "Capno" is derived from the Greek word "kapnos", which means smoke, and is used in medical terminology to refer to carbon dioxide. "Graphy" is a suffix used in English to denote a process or form of drawing, writing, or recording.
Procedure
In colorimetric capnography, a chemical indicator changes color in response to the presence of carbon dioxide. The color change is then compared to a reference chart to determine the concentration of carbon dioxide. This method is non-invasive and provides immediate results, making it a valuable tool in emergency and critical care settings.
Related Terms
- Capnography: The monitoring of the concentration or partial pressure of carbon dioxide in the respiratory gases.
- End-tidal CO2: The level of carbon dioxide released at the end of an exhaled breath.
- Respiration: The process of inhaling oxygen and exhaling carbon dioxide.
- Pulse oximetry: A test used to measure the oxygen level (oxygen saturation) of the blood.
Applications
Colorimetric capnography is used in various medical applications, including:
- Verifying endotracheal tube placement: The presence of carbon dioxide indicates that the tube is correctly placed in the trachea and not in the esophagus.
- Monitoring patients during sedation: The technique allows healthcare providers to monitor the patient's respiratory status and detect any potential complications.
- Assessing the effectiveness of cardiopulmonary resuscitation (CPR): A change in the color of the indicator suggests that the patient's circulation is improving.
External links
- Medical encyclopedia article on Colorimetric capnography
- Wikipedia's article - Colorimetric capnography
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