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mayoheart 158497-- Charles Okeke walks with JoJo Okyere in the Mayo Clinic Hospital. Anytime Okeke needs to go somewhere, he must be accompanied by a technician to monitor his Total Artificial Heart. The Total Artificial Heart weighs 400 pounds keeping him stuck in the hospital until he can get a heart transplant or until he can be hooked up to a more portable version. (Pat Shannahan/ The Arizona Republic)