Journal of Applied Physiology, Vol 43, Issue 3 563-565, Copyright © 1977 by American Physiological Society
An analog approach to measuring O2 uptake on-line
S. M. Cain and T. C. Donald
An analog circuit has been designed to provide a solution to the Haldane
transformation that yields true O2 fraction. Incoming signals proportional
to fractional concentration of CO2 and O2 in mixed expired gas are utilized
in the circuit and the results are multiplied by a value proportional to
ventilation. The final products are analog signals proportional to O2
uptake and CO2 output. The system is applicable to the anesthetized and
paralyzed animal kept at a known constant ventilation. The final products
are analog signals proportional to O2 uptake and CO2 output. The system is
applicable to the anesthetized and paralyzed animal kept at a known
constant ventilation. Diagrams of the circuit and expired gas collection
and analysis arrangements are provided.
