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Figure 1 The Venn diagram depicts the universe of patients with LBBB evaluated in the emergency department and the relationships between LBBB and AMI. Categories/subsets emphasize the wide range of possibilities that exist. The Venn diagram is discussed in the text.
The LBBB with new ST displacement subset emphasizes there may be ECG changes helpful in diagnosing AMI. The scoring system of Sgarbossa is one approach. ST-segment elevation >1 mm and concordant with QRS complex, 5 points; ST-segment depression >1 mm in lead V1, V2, and V3, 3 points; ST-segment elevation >5 mm and discordant with QRS complex, 2 points; an ECG score of 3 is used to diagnose AMI; 2 is suspicious for AMI.
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