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Figure 2 Effect of Septal Ablation on the LVOT Gradient

(A) Change in left ventricular outflow tract (LVOT) gradient with septal ablation, (B) change in left atrial pressure (LAP) with septal ablation, and (C) the relation between change in LVOT gradient and change in LAP with septal ablation. Septal ablation resulted in variable effects on left atrial pressure, which correlated with the extent of LVOT gradient reduction. Closed circles = patients with resting LVOT gradients of 40 mm Hg; open circles = patients with resting LVOT gradients of <40 mm Hg.