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A heart monitoring system for assessing a patient's cardiac
condition. Bioimpedance components induce an electric current
through the thorax of a patient's body and a first signal
representing amplitude of transthoracic impedance as a function of
time is obtained. Electrocardiograph components obtain an
electrocardiograph signal from the patient simultaneously with the
first signal. First processing circuitry is connected to the
bioimpedance components for processing the first signal and
producing therefrom a second signal representing cardiovascular
hemodynamic changes as a function of time. Second processing
circuitry is connected to the electrocardiograph components for
measuring changes in the electrocardiograph signal. An analyzer is
connected to the first and second processing circuits for producing
an output indicating changes in a portion of the second signal over
a period of time relative to changes in the electrocardiograph
signal over the same period of time. A presentation device presents
a visualization of the output of the analyzer for use in providing
an assessment of cardiac condition.