Summary
A simplified measurement of oxygen consumption was investigated in 15 spontaneously ventilating and 11 apnoeic patients in the intensive care unit following open-heart surgery, using a Godart Pulmonet type 11e. Three consecutive measurements were performed on each patient to define the reproducibility of the method. The coefficient of variation of Vo2 was ±3.16 per cent and ±3.42 per cent in spontaneously breathing and apnoeic patients respectively. Arteriomixed venous oxygen difference (Cao2-CvO2) was also measured and cardiac output (CO) calculated using the Fick principle, in the spontaneously ventilating patients. Coefficient of variation of Cao2-CvO2 and CO values were±4.63 per cent and ±4.70 per cent respecetively.
RéSUMé
Les auteurs ont fait l’évaluation d’une méthode simple permettant d’établir la consommation d’oxygène (Vo2) au moyen d’un appareil Pulmonet de Godart de type 114. Ces mesures ont été effectuées dans l’unité de soins intensifs, après chirurgie cardiaque, chez quinze malades en respiration spontanée et chez onze autres curarisés et apnéiques. On a repris la procédure à trois reprises chez chaque malade afin d’établir la marge de variation de la méthode. Le coefficient de variation a été respectivement de ±3.16 et de ±3.42 pour cent chez les malades en respiration spontanée et chez ceux en apnée.
On a également fait la mesure de la différence artério-veineuse (Cao2-Cvo2) et ainsi on a pu calculer le débit cardiaque selon le principe de Fick chez les malades en respiration spontanée.
Les coefficients de variations de la différence artério-veineuse centrale (Cao2Cvo2) et ceux du débit cardiaque s’établissaient respectivement à ±4.63 et ±4.7 pour cent.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Huntsberger, D.V. &Leaverton, P.E. Statistical inference in the biomedicai sciences. Boston, Allyn and Bacon (1970) page 29.
Thomasson, B. Cardiac output in normal subjects under standard basal conditions. The repeatability of measurements by the Fick method. Scand. J. Clin. & Lab. Investigation9: 365 (1957).
Seely, R.D., Nerluk, W.E., &Gregg, D.E. The comparison of cardiac output determined by the Fick procedure and a direct method using the rotameter. Circulation1: 1261 (1950).
Grevik, A. Errors of the dye dilution method compared to the direct Fick method in determination of cardiac output in man. Scand. J. Clin. & Lab. Investigation18: 486 (1966).
Enchoff, E., Michaelsson, M., Pavek, U., &Sjogren, S.A. A comparison between the thermal dilation method and the direct Fick and the dye dilution methods for cardiac output measurements in man. Acta. Soc. Med.75: 157 (1970).
Branthwarte, M.A. &Bradley, R.D. Measurement of cardiac output by thermal dilution in man. J. Appl. Physiol.24: 434 (1968).
Makos, G.G., Haddy, F.J., &Visscher, M.B. Discrepancies of cardiac output measured by two applications of the direct Fick principle. Am. J. Physiology117: 752 (1952).
Visscher, M.D., Johnson, J.A. The Fick principle: analysis of potential errors in its conventional application. J. Appl. Physiology5: 635 (1953).
Engstrom, C.G., Herzog, P., &Norlander, O. A method for the continuous measurement of oxygen consumption in the presence of inert gases during controlled ventilation. Acta Anaesth. Scandinav.5: 115 (1961).
Stern, B. &Strom, G. Errors and differences of method in determination of basal oxygen uptake. Nord Med.7: 243 (1957).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hoyt, J.L., Boutros, A.R. A method for measuring oxygen consumption and cardiac output in intensive care units. Canad. Anaesth. Soc. J. 22, 460–465 (1975). https://doi.org/10.1007/BF03004860
Issue Date:
DOI: https://doi.org/10.1007/BF03004860