Bradycardia is a rate that is slower than normal. In adults, a slow heart rate is usually under 60 beats per minute. At standard settings, this means there will be over 5 large grid squares between beats. There are many causes of bradycardia, including rate-slowing medications, ischemia / infarction, hypothyroidism and sleep apnoea. In an older person, sick sinus syndrome is a frequent cause of inappropriate bradycardia.
See also: Rate
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- Goldberger, A (2006) - Clinical Electrocardiography: A Simplified Approach, 9th edn, Elsevier
- Hampton, J and Hampton, J (2019) - The ECG Made Easy, 9th edn, Elsevier