Implanted Loop Recorders for Detection and Management of Arrhythmia With Bruton Tyrosine Kinase Inhibitors

Inclusion Criteria: * \>18yo * Willing to sign and date consent form, * Willing to be remotely monitored * Initiating BTK inhibitor for approved condition (i.e. CLL, Waldenstrom's, etc) * Willing to have Medtronic cardiac monitor inserted to allow at minimum 24 hours continuous monitoring prior to initiating BTK inhibitor Exclusion Criteria: * Documented AF/VA in past 12 months * Cerebral Vascular Accident (CVA) or Transient Ischemic Attack (TIA) in past year * Has current implanted pulse generator, defibrillator, pacemaker, or resynchronization device * heart surgery within past 90 days * Myocardial Infarction within past 90 days * Patient is taking an anti-arrhythmic or anticoagulant * has concomitant condition that precludes safe participation in study (substance abuse, etc) * Enrollment in separate study that could confound results of this study