capnography etymology

Etymology

• capno- (Greek): smoke, vapor
• -graphy (Greek): writing, recording

Meaning

Capnography is the graphical recording of carbon dioxide (CO2) levels in exhaled breath.

Origin

The term "capnography" was coined by British anesthesiologist William Mapleson in 1954. It was originally used to describe the technique of measuring CO2 levels in the end-tidal portion of exhaled breath, which occurs at the end of expiration.

History

Capnography has its roots in the early 1900s, when physiologists began experimenting with methods to measure CO2 levels in exhaled breath. In the 1930s, the development of infrared spectroscopy led to the first practical capnographs. However, these early devices were cumbersome and expensive.

In the 1950s, Mapleson's invention of the side-stream capnograph made capnography more accessible and practical. This device samples a small portion of exhaled breath and measures CO2 levels using infrared spectroscopy.

Over the years, capnography has evolved from a research tool to a standard of care in many clinical settings, including operating rooms, intensive care units, and emergency rooms. It is used to monitor CO2 levels during anesthesia, surgery, and other procedures that can affect respiration.

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