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Figure 2 Mean values of exercise-to-rest ratios are shown for each of the subgroups of patients with and without coronary artery disease. There was marked increase in RV:LV ratio from the resting thallium-201 to exercise Tc-99m-sestamibi or tetrofosmin in the group of patients with LM or LME CAD and less stenosis of the proximal right coronary artery (*p < 0.001 vs. normals and other CAD groups). CAD = coronary artery disease; Cath = percent diameter stenosis on cardiac catheterization; CX = circumflex CAD; LAD = left anterior descending CAD; LM = left main CAD; LME = "left main equivalent" proximal LAD and CX CAD; LV = left ventricular; RCAp = proximal right CAD; RV = right ventricular; 1 or 2VD = single- or double-vessel CAD.