There are 2 programs written in Visual Basic to assist with pressure-volume and strain analysis in rat and mouse hearts. The programs are in folders called PV Analysis and Strain 2D in the Software Setups directory in the Public Folder on Cardprint. The programs can either be setup on a remote computer with the set up file, or the *.exe file can be copied to a PC if certain Visual Basic files are on that computer (the setup program copies these automatically). If the programs were there and you are just updating, only the *.exe file needs to be copied.
The PV Analysis program can analyze files recorded from the Windaq system. Data files from Windaq must be saved at a low compression value in text format, with typically 3 columns of data, P, V and the 1 Hz timing signal. The PV Analysis program will read this text file and find the P/V data at the 1 Hz time points, save such data, curve fitting and averaging.
The Strain 2D program has 2 uses: (1) to calculate homogeneous strains from triads of coordinates. A data file will contain X-Y data points for a number of triangles, and possible "apex" and "base" coordinates for coordinate system calculations. These files can be read and smoothed, and 2D strains can be found and rotated to another coordinate system (i.e. fiber coordinates). The strain files can be saved. (2) Analysis of pressure-volume-strain data. This section can open both a pressure-volume file (created with PV Analysis above) and a strain-volume file, and fit P-V and strain-V data to compute pressure-strain curves. Such data can be plotted on the screen, averaged and saved.