[Present status and future problems of ventricular assist device].
D000328:Adult; D000368:Aged; D000818:Animals; D001243:Assisted Circulation / Q000009:adverse effects / Q000295:instrumentation / Q000639:trends; D002417:Cattle; D001026:Coronary Artery Bypass; D004285:Dogs; D011211:Electric Power Supplies; D006350:Heart Valve Prosthesis; D006801:Humans; D008875:Middle Aged; D009316:National Institutes of Health (U.S.); D014481:United States