Figure legend:
1. A. A cardiac catheterization image indicates compression (arrow) of the left anterior descending artery (LAD) due to a myocardial bridge. B. A frame of the Medistim video during systole shows the lumen of the LAD (arrow) is compressed by myocardial bridge above (arrowhead). C. A frame of the Medistim video post-myectomy shows the LAD (arrow) again in systole, now with a patent lumen with no residual muscle above the vessel.
2. A. The pre-apical myectomy TEE mid-esophageal 2 chamber view shows hypertrophied apical myocardium with a classic spade-shaped LV cavity in diastole. B. A Medistim probe image reveals the thickened apical myocardium (arrow) overriding the narrowed LV chamber (thin line). C. The post-CPB TEE mid-esophageal 2 chamber view shows an underfilled LV with a slightly higher estimated end-diastolic volume, as compared to pre-CPB imaging. The shape of the LV apical cavity appears normal after surgical reduction of the apical myocardium.