316290.fig.002a
(a)
316290.fig.002b
(b)
316290.fig.002c
(c)
316290.fig.002d
(d)
Figure 2: The same animal during atrioventricular pacing at the left ventricular (LV) apex (a), ventricular pacing at the LV apex (b), atrioventricular pacing at the lateral wall (c), and ventricular pacing at the lateral wall (d). LV twist was maintained at the same level as in sinus rhythm (Figure 1) when atrioventricular pacing was implemented at the LV apex. Atrioventricular or ventricular pacing at the lateral wall and ventricular pacing at the LV apex reduce twist significantly.