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Figure 4 The frequency of an increased RV:LV ratio from rest to exercise, defined as an exercise RV:LV ratio of >0.42 and exercise-to-resting RV:LV index ratio of >1.2, is depicted for each of the patient subgroups described in Figures 1–3. Patients with >70% LM or LME CAD but less (or absent) RCAp disease had a much greater frequency of this finding (93%) than did other groups (*p < 0.0001 vs. normals and other groups). Patients with milder degrees of LM or three-vessel CAD without a tighter proximal RCA had an intermediate frequency of this finding (30%). Abbreviations are the same as in Figures 2 and 3.
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