The sinoatrial (SA) node is the natural pacemaker of the heart. It generates electrical impulses that cause the heart’s chambers to contract, setting the heart rate. The SA node typically generates 60 ...

A pacemaker is a small device that can send electrical signals to your heart. Here's who needs a pacemaker and how it works.

Bradycardia, a slow resting heart rate, is healthy for elite athletes — but it can be dangerous if not caused by exercise ...

When high doses of AV blocking drugs are not successful to lower ventricular rates in the setting of atrial fibrillation, AV node ablation can be utilized. Remember that all atrial action potentials ...

Dear Dr. Roach: I am an 84-year-old female in relatively good health. My doctor is concerned that my heart rate is too slow, consistently in the 50s. I have worn a Holter monitor and had an ...

Osler’s nodes occur in the setting of infective endocarditis and represent immune complex deposition. Painful nodule are seen on the palms of the hands and the soles of the feet. Osler’s nodes must be ...