Torn and Frayed (S04E16)

Losing sleep over Charlie's impending brain surgery, a stretched-thin Alex teams up with Cassie when a young woman is admitted with abdominal bruising. But when it becomes clear that her injuries might have been the result of domestic abuse, Cassie and Alex must overcome not only an increasingly domineering spouse, but an increasingly reluctant victim to get their patient the help she needs. In the OR, while a run-away pacemaker puts the life of a patient on the line, forcing him to reconsider the new lease on life he's adopted, Dawn must also struggle to move on as she tries to get passed her broken relationship with Lane by painting her office. In the ER, after a night to remember for all the wrong reasons, Jackson seeks medical attention from Maggie for a neurological symptom that has the nurse anxious over his physical health and romantic future. (iTunes)