An 83-y-old man was admitted to our hospital with pneumonia and critical cardiac failure. He had severe calcific stenosis of a bicuspid aortic valve, with a pressure gradient of about 100 mmHg, poor left ventricular function and an ascending aortic aneurysm. His family requested the surgery, but there was an unacceptably high surgical risk because of the presence of serious infection. We tried percutaneous transluminal balloon aortic valvuloplasty (PTAV) with a small sized (12 mm) peripheral percutaneous transluminal angioplasty balloon as a bridge to surgery. We managed to control his critical hemodynamics and infection after the procedure. Thereafter, he underwent successful aortic valve replacement and ascending aorta replacement. PTAV may be a useful palliative therapy, but there are various procedure-related complications. To avoid such complications, we used a small sized balloon. Actually we could not completely normalize the pressure gradient, but it was enough to control his critical cardiac failure until he could undergo surgery.