John M. Miller MD FACC


Av node ablation for atrial fibrillation

How the heart’s electrical system works In a normal heart, electrical impulses pace the rhythm at which the heart contracts and relaxes. The sinoatrial (SA) node triggers the electrical impulse, causing the upper chambers (atria) to contract. The signal travels through the atrioventricular (AV) node to the…

Heart Rate Problems: Should I Get a Pacemaker?

Topic guides reader through decision to get a pacemaker for heart rate problems. Provides general overview of what pacemakers are and what heart problems can be helped with pacemakers. Lists benefits and possible complications of getting a pacemaker.

Heart Arrhythmias and Exercise

If you have an irregular heartbeat ( arrhythmia ), ask your doctor what type and level of exercise is safe for you. Regular activity can help keep your heart and body healthy. The type and amount of exercise that is allowable will vary depending on the cause of your abnormal heart rhythm and whether you have other forms…

Electrical Cardioversion

For electrical cardioversion, your doctor first gives you a medicine that relaxes you and controls pain. Then your doctor places patches either on your chest or on your chest and back, depending on your doctor’s preference. The patches send an electric current to your heart. This resets your heart rhythm.

Bradycardia (Slow Heart Rate)

What is bradycardia? Having bradycardia (say “bray-dee-KAR-dee-uh”) means that your heart beats very slowly. For most people, a heart rate of 60 to 100 beats a minute while at rest is considered normal. If your heart beats less than 60 times a minute, it is slower than normal. A slow heart rate can be normal and…