Biomaterial Database

[Effects of incomplete inspiration and previous pulmonary volume history on the nitrogen test]. 1985

Q T Pham, and D Teculescu, and P L Dao, and M Marchand

The effect of incomplete inspiration and of preceding lung volume history on the different parameters of the expired nitrogen curve after inhaling pure oxygen were studied in 12 healthy non-smokers, aged 21 to 35. The equipment used was attached to a mini-computer enabling the regulation of the measurements and the performance of the tests with immediate calculations on the different indices derived from the curve (VC, RV, TLC, delta N2, CV-closing volume, CV/VC). With each subject three measurements were made: measurements in the normal way (N) after incomplete inspiration (I) and finally after 5 forced inspirations and expirations (previous history - P). The procedure (I) gave values of VC and TLC which were lower than those observed with the other methods and the slope of delta N2 and the CV/VC were higher. After the previous lung volume history (P) VC and TLC were significantly higher, the CV/VC ratio was lower (due to the increase of CV). The measurement technique was not influenced either within sessions or between sessions a week apart.

UI	MeSH Term	Description	Entries
D008176	Lung Volume Measurements	Measurement of the amount of air that the lungs may contain at various points in the respiratory cycle.	Lung Capacities,Lung Volumes,Capacity, Lung,Lung Capacity,Lung Volume,Lung Volume Measurement,Measurement, Lung Volume,Volume, Lung
D008905	Minicomputers	Small computers that lack the speed, memory capacity, and instructional capability of the full-size computer but usually retain its programmable flexibility. They are larger, faster, and more flexible, powerful, and expensive than microcomputers.	Minicomputer
D009584	Nitrogen	An element with the atomic symbol N, atomic number 7, and atomic weight [14.00643; 14.00728]. Nitrogen exists as a diatomic gas and makes up about 78% of the earth's atmosphere by volume. It is a constituent of proteins and nucleic acids and found in all living cells.
D010100	Oxygen	An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.	Dioxygen,Oxygen-16,Oxygen 16
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults