Patent ID: 9560977
Date: 2017-02-07
CPC Classifications: A61B

Claim:
1. A method performed on a computer for estimating stroke volume of a cardiac cycle of a heart comprising: a. recording an arterial blood pressure signal; b. processing with the computer the arterial blood pressure signal to obtain five parameters which are insensitive to distortions resulting from propagation of an arterial pulse through an arterial tree; the five parameters consisting of mean arterial pressure of a cardiac cycle, end-diastolic pressure of the cardiac cycle, end-diastolic pressure of an immediately preceding cardiac cycle, duration of the cardiac cycle and duration of systole of the cardiac cycle; c. incorporating only the five parameters into a formula or algorithm to estimate with the computer the stroke volume of the cardiac cycle of the heart; d. estimating with the computer the stroke volume from the formula or algorithm; and e. outputting the estimated stroke volume from the computer and f. wherein the method further comprises estimating a characteristic time constant of the cardiac cycle and the method further includes determining coefficients associated with the formula or algorithm by analyzing a training set of arterial blood pressure signal data for which the associated stroke volumes have been independently measured.