听力原文： Vice-President Dick Chency has left a Washington hospital after doctors implanted a small device in his chest Saturday morning to prevent further episodes of an irregular heartbeat. VOA' s Paula Wolfson reports his cardiologist says the prognosis is good. Dr. Jonathon Reiner says the procedure went smoothly and the vice-president is feeling great. He'll take it easy for the rest of today. And he will be back at work on Monday morning, really in an unrestricted fashion. What can we infer from the news?