Click on image to view larger version.

Figure 4 Variable Tolerance to Multiple VT Exit Sites

Shown are the amplitude (top row), and the phase images (bottom row) generated from the equilibrium radionuclide angiograms acquired in patient GW in sinus rhythm and with 3 VT exit sites VT-1, VT-2, and VT-3. Intensity above is proportional to amplitude, and the phase image gray scale, below, parallels the contraction sequence. Regional amplitude and function were near normal in normal sinus rhythm; amplitude was moderately reduced with VT-1, with earliest Ø in the LV (black arrow), and a RBBB pattern; amplitude was well preserved with VT-2, with earliest Ø, black, in the RV (white arrow), and a LBBB pattern; The patient was intolerant to VT-3, with much-reduced amplitude and an LV septal exit site (black arrow), but with delayed RV and LVØ, in gray shades. The heart rate in each of these VT rhythms was similar. See Online Videos 3 and 4. Abbreviations as in Figures 2 and 3.