mitral valve repair supraventricular tachycardia maze procedure MITRAL VALVE REPAIR SurgiFrost is used to treat atrial fibrillation during mitral valve repair. Surgeons use the system during a well-established procedure (the Maze procedure) that is safe and effective. The use of the Maze procedure adds just a little more time to the operation. Treating atrial fibrillation in this manner has a positive impact on the patient’s lifestyle and reduces the potential for stroke. It also reduces the patient’s need for anti-arrhythmic and anti-coagulant medications as well as the side effects associated with them.