Critical Care: Sinus Rhythms

I. NORMAL SINUS

  • HEART RATE: 60-100
  • RHYTHM: Regular
  • P WAVES: Normal
  • P-R INTERVAL: Normal
  • QRS WIDTH: Normal
  • INTERVENTIONS: Continue to monitor, check pulse

II. SINUS BRADYCARDIA

  • HEART RATE: <60
  • RHYTHM: Regular
  • P WAVES: Normal
  • P-R INTERVAL: Normal
  • QRS WIDTH: Normal
  • INTERVENTIONS: Symptomatic? (low BP, pale, dizzy) – may need atropine; otherwise, monitor and check pulse

III. SINUS TACHYCARDIA

  • HEART RATE: >100
  • RHYTHM: Regular
  • P WAVES: Normal
  • P-R INTERVAL: Normal
  • QRS WIDTH: Normal
  • INTERVENTIONS: Determine causes (anxiety? pain?); may need beta blockers, calcium channel blockers, analgesics or antipyretics as appropriate

IV. SINUS ARRHYTHMIA

  • HEART RATE: Variable
  • RHYTHM: Irregular
  • P WAVES: Normal
  • P-R INTERVAL: Normal
  • QRS WIDTH: Normal
  • INTERVENTIONS: Continue to monitor, check pulse
Image Source: #1, #2.
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