All of the following conditions are more commonly associated with LBBB pattern than RBBB Pattern on ECG, Except:

Answer is D (Ashman Phenomenon) Ashman Phenomenon is more commonly associated with an RBBB aberration than LBBB. Ashman's phenomenon should be suspected in atrial fibrillation when there is a long cycle followed by a sho cycle, with the subsequent QRS complex manifesting a right bundle branch block pattern. Ashman Phenomenon is more commonly associated with an RBBB aberration than LBBB Ashman's phenomenon is a transient functional bundle brunch block resulting from an aberrant intraventricular conduction abnormality that occurs in response to a change in QRS cycle length (When a sho cycle follows a long one). RBBB aberration is typically more common than LBBB. Ashman's phenomenon should be suspected in atrial fibrillation when there is a long cycle followed by a sho cycle, with the subsequent QRS complex manifesting a right bundle branch block pattern. Acute Myocardial Infarction, Aoic Valve disease and Lev Disease are all associated with LBBB Selected Causes of Left Bundle Branch Block Coronary Hea Disease/ Acute MI (frequently with impaired left ventricular function) Hypeensive Hea Disease Aoic Valve Disease Cardiomyopathy Idiopathic fibrosis of the bundle branch fibres (Lev disease and Lenegre Disease