John M. Miller MD FACC


Heart Rhythm Problems: Diary of Symptoms

If your doctor thinks you might have a heart rhythm problem, he or she may ask you to keep a diary of symptoms. This information can help your doctor find out what type of rhythm problem you have. And if you have a rhythm problem, a symptom diary can help you keep track of your condition. You can then discuss your…

Bradycardia (Slow Heart Rate)

Having bradycardia 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. Sometimes bradycardia is normal. For example, healthy young adults and well-trained athletes…

Pacemaker for heart failure (cardiac resynchronization therapy)

A pacemaker for heart failure, used for cardiac resynchronization therapy (CRT), sends electrical pulses to the heart to keep the lower chambers (the ventricles) pumping together. This type of pacemaker is also called a biventricular pacemaker. A doctor places the pacemaker in the chest. The pacemaker has three wires…

Types of Bradycardia

There are several types of slow heart rates ( bradycardias or bradyarrhythmias). Each type carries a specific risk of complications and treatment options. Some of the types are described here. Sinus bradycardia When a person has sinus bradycardia, the heart rate is less than 60 beats per minute. This slow heart rate…