The purpose of this study is to understand individuals' physical and emotional conditions and concerns after being ventilated in the hospital. Modern hospital care helps many people survive even if they are on ventilators for long periods of time. Some individuals who leave the hospital after this kind of intensive care suffer from depression, post-traumatic stress disorder, muscle weakness, tiredness or breathing difficulties that may decrease their quality of life. Doctors know little about finding and treating these problems in survivors of mechanical ventilation.