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Figure 5 CMR Image After Septal Myectomy Versus Septal Ablation

Top panels show long-axis cardiovascular magnetic resonance (CMR) imaging views before (left) and after (right) septal myectomy. The portion of basal septum evident in this plane, projecting into the left ventricular (LV) outflow tract, has been resected at myectomy (arrows). Bottom panels show long-axis views before (left) and 5 months after (right) septal ablation. The ablation has spared the most proximal portion of basal septum at the level of systolic anterior motion and mitral valve-septal contact, involving only the more distal septum below this level of obstruction (arrows). AML = anterior mitral leaflets; Ao = aorta; LA = left atrium; RV = right ventricle.