MEDICAL SPECIALTIES HEALTH CONDITIONS PRODUCTS REIMBURSEMENT About Us Corporate Citizenship News Careers Investors USA Products CRT-D DYNAGEN™ X4 CRT-D DYNAGEN™ X4 Cardiac Resynchronization Therapy Defibrillator (CRT-D) A A Resize Print Only the X4 quadripolar CRT-D provides 17 pacing vectors plus industry-leading projected longevity for more streamlined patient care. Key Resources Technical Information Indications, Safety and Warnings