Method for determining cardiac stroke volume

Abstract

A method and apparatus is provided for determining a stroke volume (SV) of an individual, comprising the steps of: providing a first pulse contour stroke volume based on one or more characteristics ofa measured arterial blood pressure waveform or providing a conventionally derived pulse contour stroke volume, determining at least one perfusion parameter descriptive for the perfusion through the fat free mass and the adipose mass of a body of the individual, and / or determining at least one fluid responsiveness parameter function depending on a fluid responsiveness parameter descriptive for a heart-lung interaction of the individual, and adjusting the first pulse contour stroke volume or the conventionally derived pulse contour stroke volume based on at the least one of the perfusion parameter and / or the fluid responsiveness parameter function to provide a second pulse contour stroke volume.

Description

technical field [0001] The invention relates to a method for determining stroke volume. Furthermore, the invention relates to a device for determining a stroke volume and a computer-readable medium for carrying out the method. In particular, the present invention relates to methods, devices and computer readable media for determining stroke volume based on invasive or non-invasive arterial pulse contour analysis, ie so-called pulse contour stroke volume PCSV. Background technique [0002] Cardiac output, which is defined as the volume of blood pumped by the heart over time, is an important parameter for the diagnosis and management of patients, especially during surgical procedures in the intensive care unit or emergency room. Cardiac output is usually measured in liters per minute. Cardiac output CO depends on the volume of blood the heart pumps with each beat or heartbeat (which is called stroke volume) and the number of heartbeats in a given time (which is called heart ...

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Problems solved by technology

Additionally, any conventional uncalibrated biological setting of PCSV and pulse contour cardiac output (PCCO) is complicated by the fact that converting BSA from having a normal fat-free mass / fat mass ratio (FFM / AM ratio ) extrapolation of mean body size to very large obese body BSA does not take into account the greatly reduced FFM / AM ratio in obese individuals with much lower AM perfusion

[0011] Furthermore, known PCSV methods exhibited moderate to poor sensitivity in detecting changes in SV compared to the gold standard reference method, resulting in poor correlation, clinically unacceptably large limits of agreement, high percentage errors and Unsatisfactory compliance rate

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