When LabChart's PV Loop Analysis Module is set to use Sinusoidal Pressure Fit for End Systole detection it will display the End Systolic Pressure Volume Relationship (ESPVR) in the Hemodynamics Table, but it does not display the End Diastolic Pressure Volume Relationship (EDPVR). When using the Sinusoidal Pressure Fit mode the ESPVR values calculated in the hemodynamics windows are based on a single beat calculation. EDPVR is not calculated beat-to-beat, so this value is not provided in the Hemodynamics Table.
You can, however, still gain information about EDPVR within the PV Loop Module. In the Loop View graph, you have the option to display the ESPVR and EDPVR best fit regression equations. From the EDPVR regression line, you can extract information that relates to the passive filling curve of the left ventricle during diastole and chamber stiffness. The slope of EDPVR is the reciprocal of compliance and is used to measure ventricular stiffness. A decrease in compliance may be related to ventricular hypertrophy, and an increase in compliance might be related to a dilated cardiomyopathy. Please note that if you are using the PV Loop Workflows, regression information is not available when the Baseline Analysis Type is selected. Select the Occlusion Analysis Type to see this information.
In summary, LabChart 8 does not calculate EDPVR values beat-to-beat, which is why it is not displayed in the Hemodynamics Table, but information can be extracted from the regression relationship.
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