Series Editors: Shamai Grossman, Assistant Professor of Medicine; Director, Clinical Decision Unit and Cardiac Emergency Center. Beth Israel Deaconess Medical Center, Boston, MA. Peter Rosen, Senior Lecturer Emergency Medicine Harvard Medical School; Attending Emergency Physician Beth Israel Deaconess Medical Center; Visiting Clinical Professor Emergency Medicine University of Arizona; Professor Emergency Medicine University of California San Diego, MA. Editor-Chief: Amal Mattu, MD, Professor of Emergency Medicine and Vice Chair, Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD, USA. Dr. Mattu is one of the leading emergency medicine educators in the US and a strong advocate for geriatric emergency medicine training. He has authored or co-authored 5 books for Wiley, including his extremely successful ECGs for Emergency Physicians titles, which have been perennial bestsellers. Dr. Mattu is Consulting Editor for Emergency Medicine Clinics of North America; he is a popular speaker at conferences around the world and he has won multiple awards for his excellence in teaching, including national awards from the American College of Emergency Physicians, the American Academy of Emergency Medicine, and the Council of Residency Directors in Emergency Medicine.