Sinus Tachycardia | Tachyarrhythmias - MedSchool
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Tachyarrhythmias
 
 
Tachyarrhythmias
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.
 

Sinus Tachycardia

 
 

Overview

  • 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.
    • Look For

    • Heart rate >100bpm
    • Regular rhythm (RR interval)
    • Each P wave followed by a QRS complex
    • Positive P wave in leads I and II
    •  
    • 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
Last updated on December 29th, 2018
 
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