Left ventricular pressure and volume data acquisition and analysis using LabVIEW(TM)

To automate analysis of left ventricular pressure-volume data, we used LabVIEW(TM) to create applications that digitize and display data recorded from conductance and manometric catheters. Applications separate data into cardiac cycles, calculate parallel conductance, and calculate indices of left ventricular function, including end-systolic elastance, preload-recruitable stroke work, stroke volume, ejection fraction, stroke work, maximum and minimum derivative of ventricular pressure, heart rate, indices of relaxation, peak filling rate, and ventricular chamber stiffness. Pressure-volume loops can be graphically displayed. These analyses are exported to a text file. These applications have simplified and automated the process of evaluating ventricular function.