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A new method for measurement of carb...

Preiss, David Alan.

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A new method for measurement of carbon dioxide flux in the lungs during breathing.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A new method for measurement of carbon dioxide flux in the lungs during breathing./
作者:	Preiss, David Alan.
面頁冊數:	63 p.
附註:	Source: Masters Abstracts International, Volume: 41-06, page: 1769.
Contained By:	Masters Abstracts International41-06.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MQ78504
ISBN:	0612785041

A new method for measurement of carbon dioxide flux in the lungs during breathing.
Preiss, David Alan.

A new method for measurement of carbon dioxide flux in the lungs during breathing. - 63 p.

Source: Masters Abstracts International, Volume: 41-06, page: 1769.

Thesis (M.A.Sc.)--University of Toronto (Canada), 2003.

I have developed a method of measuring alveolar ventilation (V&dot;<smcap> A</smcap>) for the purposes of calculating minute carbon dioxide production (V&dot; <smcap>CO</smcap>2) in subjects breathing via a partial rebreathing circuit. I consider the patient and circuit as a single metabolic unit and make calculations based on mass balances around the circuit. V&dot; <smcap> A</smcap> is determined by gradually reducing the flow of fresh gas (FGF) delivered to the partial rebreathing circuit until the end-tidal pressure of CO2 (P<smcap>ET</smcap>CO2) begins to rise, indicating that previously exhaled gas is being rebreathed. The FGF delivered to the circuit at this point is equal to V&dot; <smcap>A</smcap>. Fourteen subjects breathed via a partial rebreathing circuit at rest. The sequential delivery of fresh gas and rebreathed gas through the circuit allowed V&dot; <smcap> A</smcap> to be identified when the flow was reduced to a point where P<smcap> ET</smcap>CO2 just began to rise. V&dot; <smcap>CO</smcap> 2 was then calculated as (FGF x P<smcap>ET</smcap>CO2)/(barometric pressure). V&dot; <smcap>CO</smcap>2 was compared to that measured by a commercial metabolic cart (MC) and a standard bag collection. The difference (M +/− SD) between V&dot; <smcap>CO</smcap>2 measured by the new method and the bag collection was 0.009 ± 0.037 L/min, and between the MC and the bag collection was 0.001 ± 0.052 L/min. The coefficients of variation for the circuit and MC on a test-retest basis were 2.8 and 11.4%, respectively, and the coefficients of variation for the circuit and the MC on a breath-by-breath basis were 3.3 and 34.0%, respectively. This study employs the first practical method for finding V&dot; <smcap>A</smcap> for the purposes of calculating V&dot; <smcap>CO</smcap>2 with a high accuracy and a greater precision than standard bag collections and commercial metabolic carts.

ISBN: 0612785041Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

A new method for measurement of carbon dioxide flux in the lungs during breathing.
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245 1 0 $a A new method for measurement of carbon dioxide flux in the lungs during breathing.
300 $a 63 p.
500 $a Source: Masters Abstracts International, Volume: 41-06, page: 1769.
500 $a Advisers: M. Shoichet; J. A. Fisher.
502 $a Thesis (M.A.Sc.)--University of Toronto (Canada), 2003.
520 $a I have developed a method of measuring alveolar ventilation (V&dot;<smcap> A</smcap>) for the purposes of calculating minute carbon dioxide production (V&dot; <smcap>CO</smcap>2) in subjects breathing via a partial rebreathing circuit. I consider the patient and circuit as a single metabolic unit and make calculations based on mass balances around the circuit. V&dot; <smcap> A</smcap> is determined by gradually reducing the flow of fresh gas (FGF) delivered to the partial rebreathing circuit until the end-tidal pressure of CO2 (P<smcap>ET</smcap>CO2) begins to rise, indicating that previously exhaled gas is being rebreathed. The FGF delivered to the circuit at this point is equal to V&dot; <smcap>A</smcap>. Fourteen subjects breathed via a partial rebreathing circuit at rest. The sequential delivery of fresh gas and rebreathed gas through the circuit allowed V&dot; <smcap> A</smcap> to be identified when the flow was reduced to a point where P<smcap> ET</smcap>CO2 just began to rise. V&dot; <smcap>CO</smcap> 2 was then calculated as (FGF x P<smcap>ET</smcap>CO2)/(barometric pressure). V&dot; <smcap>CO</smcap>2 was compared to that measured by a commercial metabolic cart (MC) and a standard bag collection. The difference (M +/− SD) between V&dot; <smcap>CO</smcap>2 measured by the new method and the bag collection was 0.009 ± 0.037 L/min, and between the MC and the bag collection was 0.001 ± 0.052 L/min. The coefficients of variation for the circuit and MC on a test-retest basis were 2.8 and 11.4%, respectively, and the coefficients of variation for the circuit and the MC on a breath-by-breath basis were 3.3 and 34.0%, respectively. This study employs the first practical method for finding V&dot; <smcap>A</smcap> for the purposes of calculating V&dot; <smcap>CO</smcap>2 with a high accuracy and a greater precision than standard bag collections and commercial metabolic carts.
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