<qa>  What is the name of the ventricular dysrhythmias that are uncontrolled by drug3. Sustained or symptomatic ventricular dysrhythmias uncontrolled by drug therapy or the use of an implantable defibrillator, andor significant cardiac conduction defects, e.g., 2nd degree or 3rd degree AV block, or sick sinus syndrome, unless a functioning pacemaker is in place. 