Dr. Hugh Calkins answers the question: 'Atrial Fibrillation vs. Atrial Flutter?' — -- Question: My doctor told me I sometimes have atrial fibrillation and at other times have atrial flutter. What ...

DEAR DR. ROACH: I’m a 67-year-old man who developed typical atrial flutter two years ago, but I haven’t had any symptoms that I am aware of. I don’t have a history of heart problems. My heart rate was ...

The rhythm in Figure 1 has a subtle pattern—a narrow QRS complex with alternating short and long R-R intervals, resulting in paired QRS complexes. Careful observation of V1 in Figure 2 reveals tiny ...

Narrow QRS complexes occur regularly. This tracing suggests either atrial flutter or ventricular tachycardia. It is not atrial flutter, however. If it were, the QRS complexes occurring regularly would ...

The beat of your heart can tell you a lot. It may race on your way to a first date. It can speed up when you’re too stressed or have had too much coffee. Or maybe it slows down during a blissful visit ...

While the Chargers were warming up in Denver last Sunday, Jim Harbaugh felt his heart racing. He knew that feeling, having experienced it as a player in 1999 and as an NFL head coach 13 years later. A ...