‘Crochetage’ sign on ECG

‘Crochetage’ sign on ECG

‘Crochetage’ sign on ECG seen in

[A] ASD
[B] VSD
[C] TGA
[D] TOF

‘Crochetage’ sign on ECG

  1. ‘Crochetage’ sign on ECG – Notch near the apex of the R wave in inferior limb leads
  2. Crochetage sign is independent of the incomplete RBBB pattern
  3. When RBBB occurs with crochetage sign in all inferior limb leads, as in this index case, the specificity of the ECG diagnosis of ASD is remarkably high
‘Crochetage’ sign on ECG
Notch near the apex of the R wave in inferior limb leads – II, III, aVF
‘Crochetage’ sign on ECG in secundum ASD

Pranab Jyoti Bhattacharyya
http://dx.doi.org/10.1136/bcr-2016-217817
  • Incomplete right bundle branch blocks – markers for atrial septal defects
  • Crochetage sign – does not depend completely on the presence of an incomplete right bundle branch block for diagnosis
  • Why it is called ‘crochetage’ – because the notch resembles the work of a crochet needle
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