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Circulation Research. 1956;4:450-455

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(Circulation Research. 1956;4:450.)
© 1956 American Heart Association, Inc.

Amplifier for Linear Recording of Oxygen Saturation and Dye Dilution Curves

CURT WIEDERHIELM B.S.1

1 Cardiology Laboratory, Department of Medicine, University of Washington, Seattle, Washington

An amplifier system has been designed for use with commercially available oximeter earpiece or cuvette and a direct recording oscillograph. Linear response to changes in oxygen saturation and in vivo dye concentrations are obtained with a rise time less than 0.5 sec., noise level and drift less than 2.5 per cent and accuracy comparable to Van Slyke-Neill method. Standard error of estimate between Van Slyke-Neill manometric and cuvette oximeter amplifier-recorder systems is ±2 per cent.






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