Shake Your Groove Thing

Meredith realizes that she must take on a lot more responsibility when she is told that her mother needs to sign over all of her assets to her. As Izzie prepares to have a party for her boyfriend Hank (the scale of which is unknown to Meredith), Meredith has her first heart surgery.  During the surgery she fears that she has fallen asleep and damaged the patient's heart. Meanwhile, Cristina and Burke hit it off. At the party, Meredith and Derek get caught together by Dr. Bailey.