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Figure 4 Conduction Does Not Vary at 109 Beats/Min
Conduction does not vary ("flat restitution") at 109 beats/min (i.e., diastolic interval [DI]  270 to 290 ms), measured as activation time (AT) from right ventricle apical (RVA) extrastimuli to a second monophasic action potential (MAP) site. This was true for (A) preserved restitution, where AT prolonged only for very short DI (<40 ms) in a 55-year-old man with LVEF of 35%; and (B) broad restitution, whereas AT prolonged for DI <120 ms in a 62-year-old man with LVEF of 31%. Both patients had coronary artery disease. CL = cycle length; RVOT = right ventricular outflow tract; other abbreviations as in Figure 1.
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