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Figure 2 A representative case of a 50-year-old woman. Left ventricular ejection fraction (LVEF) is 35%, and this patient is in New York Heart Association (NYHA) functional class II. (A) Increased lung uptake and severely reduced myocardial uptake are observed on the delayed 123I-MIBG planar image. The delayed HMR is 1.4. (B) The relationship between heart rate (HR) and LV dP/dtmax of this patient is shown. The baseline LV dP/dtmax and maximum LV dP/dtmax are 1,107 mm Hg/s and 1,284 mm Hg/s, respectively. The percentage change in LV dP/dtmax from the baseline to the critical HR is 10%. A biphasic pattern of change in LV dP/dtmax is observed. bpm = beats per minute; other abbreviations as in Figure 1.
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