Method, a system and a computer program product for determining a beat-to-beat stroke volume and/or a cardiac output

Abstract

The invention relates to a method 10 for determining a beat-to-beat stroke volume 9 a and/or a cardiac output 9 b based on a measurement 2 of suitable arterial pressure data. At the step 4 a waveform of the arterial pressure pulse is assessed based on data obtained during the measurement of step 2. At step 6 a compliance or impedance in dependence of at least one measurement of arterial pressure data is computed using a non-linear model 7. The non-linear model may comprise an arctangent model. The arctangent model may be differentiated numerically or analytically to obtain the compliance or the impedance of an aortic portions. The thus obtained compliance or impedance may then be substituted into a linear model 8. The linear model 8 may comprise a Windkessel model 8 a, or a Waterhammer model 8 b or any other suitable linear pulse contour model 8 c. As a result, the beat-to-beat stroke volume 9 a and/or cardiac output 9 b are computed.

What is claimed is: 
     
         1 . A non-transitory computer program product executable to cause a processor to carry out steps comprising:
 computing a compliance or impedance using a non-linear model and based on at least one measurement of arterial pressure data;   computing a stroke volume or a cardiac output using a pulse contour method and based on the measurement of the arterial pressure data and the computed compliance or impedance.   
     
     
         2 . A processor-based system including a processor configured to carry out steps comprising:
 computing a compliance or impedance using a non-linear model and based on at least one measurement of arterial pressure data;   computing a stroke volume or a cardiac output using a pulse contour method and based on the measurement of the arterial pressure data and the computed compliance or impedance.