A lady presents with grade 3 dyspnea. She has severe mitral strenosis with atrial fibrillation. Also increased ventricular rate with a clot in the left atrium. Which of the following should not be done?
Diltiazem to reduce the hea rateWarfarin therapy Warfarin therapy Open mitral commissurotomy and removal of clot Cardioversion with percutaneous balloon valvotomy