Patent ID: 7169111

Claim:
A method for evaluating cardiac performance in a body of a subject having a circulatory system, the method comprising: (a) measuring outputs of a plurality of sensors, each sensor deployed at a site of the circulatory system of the subject and providing a signal constituting a channel, each channel having an output; (b) collecting a plurality of channel outputs from the plurality of channels at specified instants of time; (c) expressing the plurality of channel outputs in terms of a finite set of auto-regression parameters by recursive solution of an estimation model for auto-correlation functions, thereby estimating an impulse response and transfer function for each channel; (d) estimating an input by deconvolution based on the estimated impulse response and the plurality of channel outputs to provided an indication of cardiac performance; and (e) updating the finite set of auto-regression parameters based on continued performance of steps (a), (b), (c), and (d) in which new data points are included and earlier data points are disregarded.