Frequently repeated Fick cardiac output measurements during anesthesia
Autor: | Koji Morita, Kazuyuki Ikeda, Matsuyuki Doi |
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Rok vydání: | 1990 |
Předmět: |
Cardiac output
Health Informatics Respiratory gas monitoring Anesthesia General Critical Care and Intensive Care Medicine Fick principle Hemoglobins medicine Humans In patient Oximetry Cardiac Output Oxygen saturation (medicine) Monitoring Physiologic business.industry General Engineering Monitoring system Oxygen uptake body regions Oxygen Anesthesiology and Pain Medicine medicine.anatomical_structure Anesthesia cardiovascular system Vascular resistance Vascular Resistance business |
Zdroj: | Journal of clinical monitoring. 6(2) |
ISSN: | 0748-1977 |
Popis: | A computer-based system was developed for monitoring cardiac output using the Fick principle during general anesthesia. The variables of the oxygen-consumption Fick equation were measured using the following system: oxygen uptake by an originally developed respiratory gas monitoring system, arteriovenous oxygen saturation difference by pulse and fiberoptic oximetry, and hemoglobin concentration by an in vitro oximeter. Fick cardiac output and systemic vascular resistance were calculated every 30 seconds. Fick cardiac output was compared with thermodilution cardiac output in 11 anesthetized patients. A total of 208 corresponding cardiac output measurements showed a range of 2 to 9 L.min-1. The correlation coefficient between the thermodilution and Fick cardiac outputs was 0.961, with a regression equation of Fick cardiac output = 1.058 thermodilution cardiac output - 0.359. The difference between the thermodilution and Fick cardiac outputs was 0.103 +/- 0.395. The Fick cardiac output was significantly lower than the thermodilution cardiac output, especially in the low flow range. We demonstrated that this new monitoring system was clinically feasible and sufficiently accurate, under the limited circumstances of our study. The integration of routinely used equipment has made possible a frequently repeatable method for estimating cardiac output in patients. |
Databáze: | OpenAIRE |
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