This is article with a Video tutorial, where you will learn basic of left bundle branch. In this video tutorial you will learn how to identify LBBB; how to differentiate from RBBB, mechanism of LBBB ECG changes in most simplified way. Criteria for dignosis of Complete LBBB, how to diagnose incomplete LBBB. And also how to diagnose MI in presence of LBBB i.e. sgarbossa criteria explained in most simplified way
- Concordant ST elevation > 1mm in leads with a positive QRS complex (score 5)
- Concordant ST depression > 1 mm in V1-V3 (score 3)
- Excessively discordant ST elevation > 5 mm in leads with a negative QRS complex (score 2). This criterium is sensitive, but not specific for ischemia in LBBB. It is however associated with a worse prognosis, when present in LBBB during ischemia.