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Colorimetric capnography is a qualitative measurement method that detects the presence of carbon dioxide (CO2, a relatively acidic gas) in a given gaseous environment. From a medical perspective, the method is usually applied by exposing litmus paper/film to an environment containing a patient's airway gases (i.e. placing it into their breathing circuit/airway circuit), where it will then ...
Capnography measures the elimination of CO 2 which may be of greater clinical usefulness than oxygenation status. [4] During the normal cycle of respiration, a single breath can be divided into two phases: inspiration and expiration. At the beginning of inspiration, the lungs expand and CO 2 free gasses fill the lungs.
In colorimetric capnography, the indicator is incorporated in an aqueous matrix that provides a pH just above the indicator's colour change. [4] When exposed to carbon dioxide (CO 2 ), it undergoes a colour change from purple to yellow, because when CO 2 dissolves in the matrix, it forms carbonic acid .
These experiments sought to quantify the typical human chromatic response (color perception) and define it as the standard (colorimetric) observer. The standard observer is defined by the 3 color matching functions in one of the CIE 1931 color spaces.
Colorimetry is "the science and technology used to quantify and describe physically the human color perception". [1] It is similar to spectrophotometry, but is distinguished by its interest in reducing spectra to the physical correlates of color perception, most often the CIE 1931 XYZ color space tristimulus values and related quantities.
Colorimetric analysis is a method of determining the concentration of a chemical element or chemical compound in a solution with the aid of a color reagent.It is applicable to both organic compounds and inorganic compounds and may be used with or without an enzymatic stage.
Waveform capnography has emerged as the gold standard for the confirmation of tube placement within the trachea. Other methods relying on instruments include the use of a colorimetric end-tidal carbon dioxide detector, a self-inflating esophageal bulb, or an esophageal detection device. [ 35 ]
Capnography; Certified anesthesia technician; Certified anesthesia technologist; Certified anesthesiologist assistant; Cisatracurium besilate; Coinduction (anesthetics) Colorimetric capnography; Concentration effect; Cormack–Lehane classification system