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 (no͞o′mə-tăk′ə-grăf′, nyo͞o′-) or pneu·mo·tach·y·graph (-tabreve;k′ē-)
An apparatus for recording the rate of airflow to and from the lungs.

[pneumo- + Greek takhos, speed + -graph.]

pneu′mo·tach′o·graph′ic adj.
pneu′mo·ta·chog′ra·phy (-tə-kŏg′rə-fē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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A major change in objective measurements was produced by describing a spirometer by Hutchinson in 1846 [2], which together with pneumotachography, introduced by Fleisch in the 1920s, created a basis for future volume and flow measurements.
The technique of measuring transpulmonary pressure and respiratory airflow with esophageal manometry, airway manometry, and pneumotachography has been previously described [1].
When done properly, the process of pneumotachography will produce accurate and precise flow and volume data for spirometry, diffusion capacity, lung volumes and exercise studies.