What are some causes and symptoms for low heart rates?

Causes of low heart rate (bradycardia)

* Heart problems:

* Heart block

* Sick sinus syndrome

* Atrioventricular nodal reentry tachycardia (AVNRT)

* Wolff-Parkinson-White syndrome

* Hyperthyroidism

* Hypothyroidism

* Diabetes

* Heart failure

* Cardiomyopathy

* Pericarditis

* Medications:

* Beta-blockers

* Calcium channel blockers

* Digoxin

* Clonidine

* Methyldopa

* Other medical conditions:

* Sleep apnea

* Anemia

* Sepsis

* Electrolyte imbalances

* Hypothermia

Symptoms of low heart rate (bradycardia)

* Fatigue

* Weakness

* Lightheadedness

* Dizziness

* Confusion

* Syncope (fainting)

* Shortness of breath

* Chest pain