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Figure 3 Scatterplots of individual data points of rest and exercise RV:LV perfusion ratio for each patient in the study are shown, grouped by CAD anatomic features or normalcy. The RV:LV perfusion ratios are highly correlated (p < 0.0001) for each subgroup of patients, except for the patients with LM CAD or LME CAD and a lesser degree of (or absent) RCAp disease (A), in whom the exercise RV:LV index is much greater than the resting RV:LV, with r = 0.39, p = NS. The criteria of an exercise RV:LV ratio of >0.42 and exercise to resting RV:LV index ratio of >1.2 was met by the majority of this group, but by no one with a proximal RCA lesion as their tightest stenosis. These criteria were met by only three patients with no significant CAD on Cath and only one patient in the normalcy group (B). The frequency of this finding increased as the degree of CAD increased (C). Abbreviations are the same as in Figure 2.
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