St. Jude Medical, Inc. develops, manufactures, and distributes cardiovascular and implantable neurostimulation medical devices worldwide. It operates in four segments: Cardiac Rhythm Management, Cardiovascular, Atrial Fibrillation, and Neuromodulation. The Cardiac Rhythm Management segment offers products for cardiac arrhythmias, or irregular heart beats. Its products include tachycardia implantable cardioverter defibrillator systems to provide therapy to patients suffering from lethal heart conditions, such as sudden cardiac arrest; cardiac resynchronization therapy devices to treat patients suffering from heart failure; pacemakers to help people whose hearts beat too slowly or who suffer from other cardiac arrhythmias; and leads that connect devices to the heart to carry the electrical impulses to the heart and provide information from the heart to the device. The Cardiovascular segment offers mechanical and tissue replacement heart valves, as well as heart valve repair products. It also provides vascular products, including vascular closure devices, compression assist devices, pressure measurement guidewires, diagnostic coronary imaging technology, vascular plugs, percutaneous catheter introducers, and diagnostic guidewires. The Atrial Fibrillation segment offers a system of products for access, diagnosis, visualization, and ablation that assist physicians in diagnosing and treating various irregular heart rhythms; and for use in the electrophysiology lab and cardiac surgery. It provides electrophysiology introducers and catheters, cardiac mapping, navigation and recording systems, and ablation systems. The Neuromodulation segment offers a range of neurostimulation systems, such as rechargeable implantable pulse generators (IPGs), primary cell IPGs, and radio frequency powered systems. St. Jude Medical, Inc. markets its products through direct sales force and independent distributors. The company was founded in 1976 and is headquartered in Saint Paul, Minnesota.