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Sgarbossa’s criteria for diagnosing AMI in the presence of LBBB   Leave a comment

AMI: acute myocardial infarction
LBBB: left bundle branch block

Presence of:

  1. ST segment elevation ≥1mm and concordant with QRS complex — score 5
  2. ST segment depression ≥1mm in lead V1, V2 or V3 — score 3
  3. ST segment elevation ≥5mm and discordant with QRS complex — score 2

score ≥3 has high specificity (90%) but low sensitivity for AMI. which means highly likely to have AMI (or adverse cardiovascular outcome) if present, but absence does not mean no AMI.

 
*definition of LBBB (all of the following):

  • QRS duration at least 0.125 sec in presence of sinus or supraventricular rhythm
  • QS or rS complex in V1
  • R-wave peak pattern of at least 0.06 sec in lead I, V5 or V6 associated with absence of Q wave in the same lead

 
Ref:
Sgarbossa EB, Pinski SL, Barbagelata A, et al. GUSTO-1 Investigators. Electrocardiographic diagnosis of evolving acute myocardial infarction in the presence of left bundle-branch block. N Engl J Med 1996;334:481-487.

Posted October 10, 2011 by absinthemisia in Cardiology

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