A paradoxical pulse (a palpable decrease in pulse amplitude on quiet inspiration) signals pericardial tamponade. a complication of CABG surgery. Option A: Left-sided heart failure can cause.Option A: Left-sided heart failure can cause pulsus alternans (pulse amplitude alternation from beat to beat. with a regular rhythm).Option B: Aortic regurgitation may cause bisferious pulse (an increased arterial pulse with a double systolic peak).Option C: Complete heart block may cause a bounding pulse (a strong pulse with increased pulse pressure).