Heart is the most important organ of the body, and its impossible to live without it.But An American teen-girl survived for 118 Days without a heart, kept alive by a custom-built artificial blood-pumping device, until she was able to have a heart transplant in Miami.D’zhana Simmons of South Carolina, 14, is literally a walking, talking, medical miracle. She suffered from dilated cardiomyopathy, a condition in which the patient's heart becomes weakened and enlarged and does not pump blood efficiently.The patient, D'Zhana Simmons of South Carolina, said the experience of living for so long with a machine pumping her blood was "scary.""You never knew when it would malfunction," she said, her voice barely above a whisper, at a news conference at the University of Miami/Jackson Memorial Medical Center."It was like I was a fake person, like I didn't really exist. I was just here," she said of living without a heart.