Sinus Bradycardia

Definition

  • Sinus rhythm with a resting heart rate of < 60 bpm in adults, or below the normal range for age in children.

Normal heart rates in children

  • Newborn: 110 – 150 bpm
  • 2 years: 85 – 125 bpm
  • 4 years: 75 – 115 bpm
  • 6 years+: 60 – 100 bpm

Causes

Non-pharmacological

Pharmacological

Differential Diagnosis

ECG Example

Sinus bradycardia secondary to anorexia nervosa

  • Sinus bradycardia (35 bpm) in a 15-year old girl with anorexia nervosa.
  • Note the prominent U waves in the precordial leads, a common finding in sinus bradycardia.

Related Topics

Further Reading

Author Credits

References

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