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Figure 1 Examples of MRI tagging images, acquired during LVbase pacing. Presented are short-axis images at the papillary level, with taglines oriented at an angle of 0 (SA 0) and 90° (SA 90) with the circumference and long-axis images with taglines at an angle of 90° with the long axis (LA 90). In plane, resolution was 1.25 mm (readout direction) x 3 mm (phase encoding direction) and slice thickness was 7 mm. Images were taken every 20 ms, frame 0 being the time when taglines were parallel. Note the inward bending of taglines at the LV anterior wall and the outward bending in the septum in the SA0 image of frame 4, indicating early systolic shortening and stretching in these regions, respectively.
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