Anterior papillary muscle Tachycardia has RBBB pattern with right inferior QRS axis while posterior papillary muscle tachycardia has RBBB, superior axis.
Patent foramen ovale is a valvular opening in the region of fossa ovalis of interatrial septum, remains closed due to higher pressure on left atrial side.
Though life threatening cardiac arrhythmias are the most important adverse effects seen with digitoxicity, the most common ones are anorexia and nausea.