Figure 4:  .

Comparison of segmental activity on a resting technetium-99m sestamibi scan with segmental activity on the redistribution image from a resting thallium-201 scan in segments with abnormal contractile function. There was a significant correlation (r = 0.78) between segmental activity on the two scans, although there was some variability. More importantly, activity in those segments with dysfunction which improved after revascularisation generally exceeded 60% of peak counts on both scans. In contrast, dysfunctional segments that did not improve following revascularisation, presumably because they were fibrotic, generally had activity at less than 60% of peak counts on both scans. (Reproduced from Udelson et al. Predicting recovery of severe regional ventricular dysfunction. Comparison of resting scintigraphy with thallium-201 and technetium-99m sestamibi. Circulation 1994;89:2552, with permission of the American Heart Association.)