In this Monday, Jan. 14, 2013, photo, Dr. Steve Sun looks over a heart monitor display in the emergency room at St. Mary's Medical Center in San Francisco. A new government report shows the number of people seeking emergency treatment after consuming energy drinks has doubled nationwide over the last four years. (AP Photo/Eric Risberg)

Photo by: Eric Risberg

In this Monday, Jan. 14, 2013, photo, Dr. Steve Sun looks over a heart monitor display in the emergency room at St. Mary's Medical Center in San Francisco. A new government report shows the number of people seeking emergency treatment after consuming energy drinks has doubled nationwide over the last four years. (AP Photo/Eric Risberg)