Method and apparatus for determining cardiac output or total...

Details Method and apparatus for determining cardiac output or total... Method and apparatus for determining cardiac output or total...

A - Human Necessities

61

B

A61B 5/021 (2006.01) A61B 5/029 (2006.01) A61N 1/365 (2006.01)

Patent

CA 2326740

A method and apparatus determines continuously mean cardiac output by measuring the arterial pressure e.g. at a finger and calculating therefrom the mean arterial pressure and the time constant of the arterial system (in diastole). Compliance values are provided from a table. Mean cardiac output is then the product of mean arterial pressure and compliance divided by the time constant. Changes in cardiac output can be used for diagnostic purposes. A pressure cuff or pressure tonometer can be used to measure the arterial pressure with a microcomputer providing the necessary calculations.

Méthode et appareil permettant de déterminer le débit cardiaque moyen en continu en mesurant la pression artérielle, par exemple au niveau d'un doigt, et en calculant à partir de la pression artérielle moyenne et de la constante de temps du système artériel (en diastole ). On obtient des valeurs de conformité à partir d'un tableau. On obtient ensuite le débit cardiaque moyen en divisant la pression artérielle moyenne et la valeur de conformité par la constante de temps. Les changements observés dans le débit cardiaque peuvent servir à des fins de diagnostic. Il est possible d'utiliser un brassard de tensiomètre ou un tonomètre de pression sanguine pour mesurer la pression artérielle au moyen d'un micro-ordinateur assurant les calculs nécessaires.

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