Real-time measurement of ventricular stroke volume...

A - Human Necessities – 61 – B

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A61B 5/02 (2006.01)

Patent

CA 2570144

Ventricular stroke volume variation (SW) is estimated as a function of the standard deviation of arterial blood pressure value measured over each of at least two cardiac cycles, preferably over each of the cardiac cycles in a computation interval covering a full respiratory cycle. In one embodiment, maximum and minimum standard deviation values are determined over the computation interval. SW is then estimated proportional to the ratio of the difference between the maximum and minimum standard deviation values and the mean of the standard deviation values. In another embodiment, SW is then estimated proportional to the ratio of the standard deviation of the standard deviation values and the mean standard deviation over the entire computation interval. A pre-processing arrangement for improving reliability of estimates of more general cardiac or hemodynamic parameters is also disclosed and involves smoothing with an approximating function, and sampling and low-pass filtering at an adjustable rate.

Selon cette invention, on évalue la variation du volume d'éjection systolique ventriculaire en fonction de l'écart standard de la valeur de la pression artérielle mesurée sur chacun des deux cycles cardiaques, de préférence. sur chacun des cycles cardiaques dans un intervalle de calcul couvrant un cycle respiratoire complet. Selon un mode de mise en oeuvre, on détermine des valeurs d'écart standard maximum et minimum sur l'intervalle de calcul. Puis, on évalue la variation du volume d'éjection systolique proportionnelle au rapport de la différence entre les valeurs d'écart standard maximum et minimum et la moyenne des valeurs de l'écart standard. Selon un autre mode de mise en oeuvre, on évalue la variation du volume d'éjection systolique proportionnelle au rapport de l'écart standard des valeurs de l'écart standard et de la moyenne de l'écart standard sur la totalité de l'intervalle de calcul. L'invention porte également sur un dispositif de prétraitement permettant d'améliorer la fiabilité des estimations de plusieurs paramètres généraux hémodynamiques ou cardiaques et d'effectuer un lissage avec une fonction d'approximation, et d'échantillonner et d'effectuer un filtrage passe-bas à un débit variable.

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