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Measurement of Respiration Rate from Central Venous Pressure in the Critically Ill Patient

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4 Author(s)
P. F. Meagher ; Shock Research Unit and the Department of Medicine, University of Southern California School of Medicine and the Los Angeles County Hospital, Los Angeles, Calif., and the International Business Machines Corporation, Yorktown Heights, N. Y. ; R. E. Jensen ; M. H. Weil ; H. Shubin

Central venous pressure is measured in critically ill patients. The venous pressure is transmitted to a strain gauge transducer through a catheter inserted into the right atrium or superior vena cava. Through a signal conditioning technique using a low-pass filter with a cutoff at 0.8 c/s, the pulsatile variations related to heart action that are superimposed on the low-frequency respiratory changes are removed. The output of the respirometer is sampled every five minutes by art IBM 1710 control system computer and printed on an output typewriter, together with a number of variables, in a comprehensive patient monitoring system.

Published in:

IEEE Transactions on Biomedical Engineering  (Volume:BME-13 ,  Issue: 2 )