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Test Findings
 
 

Pathological Q Waves

 
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Overview

While T wave and ST changes revert post myocardial infarction, Q waves are permanent and thus their presence may indicate previous infarction.
  • Look For

    A negative deflection that is either broad or deep:
  • Broad: >40ms (1mm) in duration
  • Deep: >0.2mV (2mm) or ≥1/3 of R wave size
  • Pathological Q Waves
     
Non-pathological Q waves may occur in I, III, aVL, V5 and V5.
  • Causes of Pathological Q Waves

  • Myocardial infarction
  • Hypertrophic cardiomyopathy (inferior / anterior leads)
  • Dilated cardiomyopathy (leads V1 to V4)
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