Possible causes of Low heart rate

10 conditions can cause this symptom. Most common are listed first.

• Arrhythmia (abnormal heart rhythm) Common Urgent Pediatric
• Atrioventricular node conduction block Common Urgent Pediatric
• Congestive heart failure (CHF) Common Urgent
• Heart attack Common Urgent
• Hypothyroidism (low thyroid hormone) Common Pediatric
• Medication reaction Common Urgent
• Myocarditis (heart muscle inflammation) Common Pediatric
• Congenital heart disease (heart defect at birth) Urgent Pediatric
• Hemochromatosis
• Myxedema coma (severe low thyroid) Urgent