Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 3 Transition from VF to VT by formation of a figure-eight. Panel A, activation during VF. Panels B–H, transition to VT by formation of a figure-eight. See text for details. Panel I, schematic representation, with conduction velocities in different portions of the reentrant circuit (the slowest in the isthmus). Panel J shows the tissue with the PM next to the obstacle and an isthmus in between the two. Panel K, shows local electrograms of channels marked in panel I. Wavefronts marked with asterisk and plus sign in panel B are the initiators of VT. Channel 5, located at the isthmus, is shared by both circuits and shows double potentials. Panel L, pECG of the transition from VF to VT.
|
