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Alopecia areata is a condition that causes your hair to fall out. It causes bald patches on the scalp, but it can also cause hair loss on other parts of the body.

Atrial fibrillation, or A-fib, is a common type of heart arrhythmia. It causes fast, chaotic electrical signals in the atria.

Atrial flutter is a type of arrhythmia. It causes the heart to beat faster than normal. Atrial flutter can increase the risk for certain serious problems, such as stroke.

Sacral nerve stimulation helps treat bladder problems caused by diseases of the nervous system. Before sacral nerve stimulation is done, you need a trial or test procedure to see if it will work. This is called percutaneous nerve evaluation (PNE). Read on to learn the details.

Laser photocoagulation uses a laser to seal off abnormal blood vessels in your eye. This treatment can’t restore eyesight that you already have lost. But it may slow down the damage to your central vision.

Lead extraction is the removal of wires from your heart. The wires are part of an implanted cardiac device. This sheet tells you what to expect before, during, and after the procedure.

During the procedure, your doctor will insert a long, thin tube (catheter) into an artery and move it up into your heart. This procedure can be used to diagnose and treat certain heart problems.

Left bundle branch block is a problem in the heart’s electrical system. Learn more about the types of treatment for this condition.

Radiofrequency denervation is a treatment for some kinds of lower back and neck pain. It uses an electrical current created by radio waves.