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Sinus Tachycardia



Sinus tachycardia originates from the sinus node and is a physiologic response that occurs due to changes in autonomic regulation - either sympathetic activation or reduction in parasympathetic tone.


  • Causes of Sinus Tachycardia

  • Physical exertion
  • Anxiety
  • Pain
  • Trauma
  • Fever
  • Infection
  • Hypovolaemia
  • Shock
  • Hypoxia
  • Anaemia
  • Pulmonary embolism
  • Coronary ischaemia / infarction
  • Hypoglycaemia
  • Thyrotoxicosis
  • Phaeochromocytoma
  • Drugs - beta agonists, anticholinergics, theophylline, caffeine, amphetamine, cocaine, alcohol


  • ECG Findings

  • Heart rate >100bpm
  • Regular rhythm (RR interval)
  • Each P wave followed by a QRS complex
  • Positive P wave in leads I and II
  • Diagnosis
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