Cardiologist Dr. Sunil Rao answers your questions about the heart from Twitter. How do you measure your maximum heart rate? Is broken heart syndrome real? What is cholesterol? Can low dose aspirin help prevent heart attacks? Answers to these questions and many more await—it's Heart Support.Check out www.PracticalClinicalSkills.com for lessons, quizzes, and heart and lung sounds.Director: Lisandro Perez-ReyDirector of Photography: Constantine EconomidesEditor: Richard TrammellExpert: Dr.