Approval to modify the shock coil on the riata st optim and riata sts optim leads and to add two new passive lead models.  The devices, as modified, will be marketed under the trade name riata st optim lead models 7020, 7021, 7022, 7030, 7031, 7070 and 7071 and riata sts optim lead models 7120, 7121,7122, 7130, 7131, 7170 and 7171 and are indicated for use with compatible pulse generators (refer to the applicable defibrillator manul for system indications).  They provide pacing and sensing and deliver cardioversion/ defibrillation therapy to the heart.