An electrical delay or blockage in the conduction pathway that sends impulses down the left posterior fascicle of the left bundle.
•ECG Criteria:
•Prolonged QRS (0.08-0.11 sec).
•Right axis deviation > +90 degrees.
•Leads 1 and aVL: small R waves and deep S waves.
•Leads 2, 3 and aVF: small Q waves and tall R waves.
•No other explanation for the right axis deviation (e.g. right ventricular hypertrophy or anterior wall myocardial infarction).
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