II. Indications
- EKG criteria for diagnosis of acute Myocardial Infarction when Left Bundle Branch Block is present
III. Criteria: Sgarbossa
- ST segment elevation of 1 mm or more if in same direction (concordant) as QRS Complex in any lead
- Score: 5 Points
- ST segment depression of 1 mm or more in any lead from V1 to V3
- Score: 3 Points
- ST segment elevation of 5 mm or more in opposite direction (discordant) of QRS Complex
- Score: 1 Point
IV. Criteria: Modified Sgarbossa (first 2 criteria are the same as with Sgarbossa)
- ST segment elevation of 1 mm or more if in same direction (concordant) as QRS Complex in any lead
- Score: 5 Points
- ST segment depression of 1 mm or more in any lead from V1 to V3
- Score: 3 Points
- ST segment elevation / S-wave amplitude = -0.25 (modified from original Sgarbossa)
- Score: 1 Point
- References
V. Interpretation
- Score of 3 or more suggests acute Myocardial Infarction
- Primarily focuses on the concordance of ST and QRS polarity (typically opposite or discordant in normal LBBB)
VI. Efficacy
- Test Specificity: 90%
- Test Sensitivity: 20%
