FIGURE 1. Planar early and late ¹²³I-MIBG and ²⁰¹Tl images of 2 typical patients, 72-y-old man with ISM and sudden cardiac death (A) and 65-y-old woman with ICM and death from heart failure (B). Both early and late cardiac ¹²³I-MIBG uptakes are tremendously reduced in well-perfused hearts; in particular, late H/M was <1.5 in both patients.