FIGURE LEGENDS
Figure 1Intracardiac electrograms during low-output (A) and high-output (B) atrial entrainment pacing at a pacing cycle length of 240ms from CS 3,4, which corresponds to the 4’o clock position of the mitral annuls. The numbers indicate the cycle lengths in ms. I, aVF, V1 = surface electrogram; CS = coronary sinus; HRA = high right atrium.Figure 2Intracardiac electrograms during low-output (A) and high-output (B and C) atrial entrainment pacing at a pacing cycle length of 240ms from CS 3,4 after the location of a multielectrode catheter in the left atrium close to the CS 3,4. Arrow = the terminal component of the CS 7,8 potential. The numbers indicate the intervals in ms. The other abbreviations are as in Figure 1.