Paroxysmal bundle branch block a case of two to one right bundle branch block followed by intermit­tent right bundle branch block

A case of paroxysmal bundle branch block, two to one right bundle branch block followed by intermittent right bundle branch block, which is associated with chronic cor pulmonale secondary to active, far advanced pulmonary tuberculosis, is presented. The incidence and mechanism of the paroxysmal bundle branch block have been discussed.