A maze procedure is known to be an effective way to treat a patient who experiences atrial fibrillation frequently due to the abnormal and excessive transmission of electrical impulses through the heart tissues. The maze procedure is typically one of the last resort treatments because it is not minimally invasive and requires open-heart surgery. During a maze procedure, the surgeon uses cryotherapy, radiofrequency, or a scalpel to produce a particular pattern that will form into scar tissue. Scar tissue is denser than normal tissue and does not conduct electricity as healthy tissues do. The scar tissue is produced in a certain part of the patient's heart muscle to stop the ability of stray and erratic electrical impulses to flow through these tissues and cause the patient to have atrial fibrillation. The maze procedure can be done at the same time as another major open-heart surgical procedure, like a heart valve repair or coronary artery bypass. Maze procedures for atrial fibrillation are generally successful, but it is also not unheard of for atrial fibrillation to eventually return.