Unexpected Cardiac Tamponade Due to Bleeding From the Left Atrium During Transcatheter Aortic Valve Replacement

An 88 years-old woman admitted undergoing transcatheter aortic valve replacement (TAVR) because of severe aortic valve stenosis. Pre-procedural computed tomography demonstrated that annulus area was 345 mm2 ([Figure 1A][1]) and minimum diameter of Valsalva was 27.4 mm ([Figure 1B][1]).